[PATCH v4 01/11] media: videodev2.h: Add more field helper macros

[PATCH v4 01/11] media: videodev2.h: Add more field helper macros

[Steve Longerbeam]

Adds two helper macros:

V4L2_FIELD_IS_SEQUENTIAL: returns true if the given field type is
'sequential', that is a full frame is transmitted, or exists in
memory, as all top field lines followed by all bottom field lines,
or vice-versa.

V4L2_FIELD_IS_INTERLACED: returns true if the given field type is
'interlaced', that is a full frame is transmitted, or exists in
memory, as top field lines interlaced with bottom field lines.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
Changes since v3:
- none
Changes since v2:
- none
Changes since v1:
- add the complement macro V4L2_FIELD_IS_INTERLACED
- remove V4L2_FIELD_ALTERNATE from V4L2_FIELD_IS_SEQUENTIAL macro.
- moved new macros past end of existing V4L2_FIELD_HAS_* macros.
---
 include/uapi/linux/videodev2.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 29729d580452..f7f031736d91 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -130,6 +130,13 @@ enum v4l2_field {
 	((field) == V4L2_FIELD_BOTTOM ||\
 	 (field) == V4L2_FIELD_TOP ||\
 	 (field) == V4L2_FIELD_ALTERNATE)
+#define V4L2_FIELD_IS_INTERLACED(field) \
+	((field) == V4L2_FIELD_INTERLACED ||\
+	 (field) == V4L2_FIELD_INTERLACED_TB ||\
+	 (field) == V4L2_FIELD_INTERLACED_BT)
+#define V4L2_FIELD_IS_SEQUENTIAL(field) \
+	((field) == V4L2_FIELD_SEQ_TB ||\
+	 (field) == V4L2_FIELD_SEQ_BT)
 
 enum v4l2_buf_type {
 	V4L2_BUF_TYPE_VIDEO_CAPTURE        = 1,
-- 
2.17.1

[PATCH v4 02/11] gpu: ipu-csi: Swap fields according to input/output field types

[Steve Longerbeam]

The function ipu_csi_init_interface() was inverting the F-bit for
NTSC case, in the CCIR_CODE_1/2 registers. The result being that
for NTSC bottom-top field order, the CSI would swap fields and
capture in top-bottom order.

Instead, base field swap on the field order of the input to the CSI,
and the field order of the requested output. If the input/output
fields are sequential but different, swap fields, otherwise do
not swap. This requires passing both the input and output mbus
frame formats to ipu_csi_init_interface().

Move this code to a new private function ipu_csi_set_bt_interlaced_codes()
that programs the CCIR_CODE_1/2 registers for interlaced BT.656 (and
possibly interlaced BT.1120 in the future).

When detecting input video standard from the input frame width/height,
make sure to double height if input field type is alternate, since
in that case input height only includes lines for one field.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/gpu/ipu-v3/ipu-csi.c              | 132 +++++++++++++++-------
 drivers/staging/media/imx/imx-media-csi.c |  13 +--
 include/video/imx-ipu-v3.h                |   3 +-
 3 files changed, 97 insertions(+), 51 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-csi.c b/drivers/gpu/ipu-v3/ipu-csi.c
index 954eefe144e2..759fcd724ff9 100644
--- a/drivers/gpu/ipu-v3/ipu-csi.c
+++ b/drivers/gpu/ipu-v3/ipu-csi.c
@@ -325,6 +325,15 @@ static int mbus_code_to_bus_cfg(struct ipu_csi_bus_config *cfg, u32 mbus_code,
 	return 0;
 }
 
+/* translate alternate field mode based on given standard */
+static inline enum v4l2_field
+ipu_csi_translate_field(enum v4l2_field field, v4l2_std_id std)
+{
+	return (field != V4L2_FIELD_ALTERNATE) ? field :
+		((std & V4L2_STD_525_60) ?
+		 V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB);
+}
+
 /*
  * Fill a CSI bus config struct from mbus_config and mbus_framefmt.
  */
@@ -374,22 +383,75 @@ static int fill_csi_bus_cfg(struct ipu_csi_bus_config *csicfg,
 	return 0;
 }
 
+static int ipu_csi_set_bt_interlaced_codes(struct ipu_csi *csi,
+					   struct v4l2_mbus_framefmt *infmt,
+					   struct v4l2_mbus_framefmt *outfmt,
+					   v4l2_std_id std)
+{
+	enum v4l2_field infield, outfield;
+	bool swap_fields;
+
+	/* get translated field type of input and output */
+	infield = ipu_csi_translate_field(infmt->field, std);
+	outfield = ipu_csi_translate_field(outfmt->field, std);
+
+	/*
+	 * Write the H-V-F codes the CSI will match against the
+	 * incoming data for start/end of active and blanking
+	 * field intervals. If input and output field types are
+	 * sequential but not the same (one is SEQ_BT and the other
+	 * is SEQ_TB), swap the F-bit so that the CSI will capture
+	 * field 1 lines before field 0 lines.
+	 */
+	swap_fields = (V4L2_FIELD_IS_SEQUENTIAL(infield) &&
+		       V4L2_FIELD_IS_SEQUENTIAL(outfield) &&
+		       infield != outfield);
+
+	if (!swap_fields) {
+		/*
+		 * Field0BlankEnd  = 110, Field0BlankStart  = 010
+		 * Field0ActiveEnd = 100, Field0ActiveStart = 000
+		 * Field1BlankEnd  = 111, Field1BlankStart  = 011
+		 * Field1ActiveEnd = 101, Field1ActiveStart = 001
+		 */
+		ipu_csi_write(csi, 0x40596 | CSI_CCIR_ERR_DET_EN,
+			      CSI_CCIR_CODE_1);
+		ipu_csi_write(csi, 0xD07DF, CSI_CCIR_CODE_2);
+	} else {
+		dev_dbg(csi->ipu->dev, "capture field swap\n");
+
+		/* same as above but with F-bit inverted */
+		ipu_csi_write(csi, 0xD07DF | CSI_CCIR_ERR_DET_EN,
+			      CSI_CCIR_CODE_1);
+		ipu_csi_write(csi, 0x40596, CSI_CCIR_CODE_2);
+	}
+
+	ipu_csi_write(csi, 0xFF0000, CSI_CCIR_CODE_3);
+
+	return 0;
+}
+
+
 int ipu_csi_init_interface(struct ipu_csi *csi,
 			   struct v4l2_mbus_config *mbus_cfg,
-			   struct v4l2_mbus_framefmt *mbus_fmt)
+			   struct v4l2_mbus_framefmt *infmt,
+			   struct v4l2_mbus_framefmt *outfmt)
 {
 	struct ipu_csi_bus_config cfg;
 	unsigned long flags;
 	u32 width, height, data = 0;
+	v4l2_std_id std;
 	int ret;
 
-	ret = fill_csi_bus_cfg(&cfg, mbus_cfg, mbus_fmt);
+	ret = fill_csi_bus_cfg(&cfg, mbus_cfg, infmt);
 	if (ret < 0)
 		return ret;
 
 	/* set default sensor frame width and height */
-	width = mbus_fmt->width;
-	height = mbus_fmt->height;
+	width = infmt->width;
+	height = infmt->height;
+	if (infmt->field == V4L2_FIELD_ALTERNATE)
+		height *= 2;
 
 	/* Set the CSI_SENS_CONF register remaining fields */
 	data |= cfg.data_width << CSI_SENS_CONF_DATA_WIDTH_SHIFT |
@@ -416,42 +478,33 @@ int ipu_csi_init_interface(struct ipu_csi *csi,
 		ipu_csi_write(csi, 0xFF0000, CSI_CCIR_CODE_3);
 		break;
 	case IPU_CSI_CLK_MODE_CCIR656_INTERLACED:
-		if (mbus_fmt->width == 720 && mbus_fmt->height == 576) {
-			/*
-			 * PAL case
-			 *
-			 * Field0BlankEnd = 0x6, Field0BlankStart = 0x2,
-			 * Field0ActiveEnd = 0x4, Field0ActiveStart = 0
-			 * Field1BlankEnd = 0x7, Field1BlankStart = 0x3,
-			 * Field1ActiveEnd = 0x5, Field1ActiveStart = 0x1
-			 */
-			height = 625; /* framelines for PAL */
-
-			ipu_csi_write(csi, 0x40596 | CSI_CCIR_ERR_DET_EN,
-					  CSI_CCIR_CODE_1);
-			ipu_csi_write(csi, 0xD07DF, CSI_CCIR_CODE_2);
-			ipu_csi_write(csi, 0xFF0000, CSI_CCIR_CODE_3);
-		} else if (mbus_fmt->width == 720 && mbus_fmt->height == 480) {
-			/*
-			 * NTSC case
-			 *
-			 * Field0BlankEnd = 0x7, Field0BlankStart = 0x3,
-			 * Field0ActiveEnd = 0x5, Field0ActiveStart = 0x1
-			 * Field1BlankEnd = 0x6, Field1BlankStart = 0x2,
-			 * Field1ActiveEnd = 0x4, Field1ActiveStart = 0
-			 */
-			height = 525; /* framelines for NTSC */
-
-			ipu_csi_write(csi, 0xD07DF | CSI_CCIR_ERR_DET_EN,
-					  CSI_CCIR_CODE_1);
-			ipu_csi_write(csi, 0x40596, CSI_CCIR_CODE_2);
-			ipu_csi_write(csi, 0xFF0000, CSI_CCIR_CODE_3);
-		} else {
+		std = V4L2_STD_UNKNOWN;
+		if (width == 720) {
+			switch (height) {
+			case 480:
+				std = V4L2_STD_NTSC;
+				break;
+			case 576:
+				std = V4L2_STD_PAL;
+				break;
+			default:
+				break;
+			}
+		}
+
+		if (std == V4L2_STD_UNKNOWN) {
 			dev_err(csi->ipu->dev,
-				"Unsupported CCIR656 interlaced video mode\n");
-			spin_unlock_irqrestore(&csi->lock, flags);
-			return -EINVAL;
+				"Unsupported interlaced video mode\n");
+			ret = -EINVAL;
+			goto out_unlock;
 		}
+
+		ret = ipu_csi_set_bt_interlaced_codes(csi, infmt, outfmt, std);
+		if (ret)
+			goto out_unlock;
+
+		/* framelines for NTSC / PAL */
+		height = (std & V4L2_STD_525_60) ? 525 : 625;
 		break;
 	case IPU_CSI_CLK_MODE_CCIR1120_PROGRESSIVE_DDR:
 	case IPU_CSI_CLK_MODE_CCIR1120_PROGRESSIVE_SDR:
@@ -476,9 +529,10 @@ int ipu_csi_init_interface(struct ipu_csi *csi,
 	dev_dbg(csi->ipu->dev, "CSI_ACT_FRM_SIZE = 0x%08X\n",
 		ipu_csi_read(csi, CSI_ACT_FRM_SIZE));
 
+out_unlock:
 	spin_unlock_irqrestore(&csi->lock, flags);
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(ipu_csi_init_interface);
 
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 4acdd7ae612b..ad66f007d395 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -666,7 +666,6 @@ static int csi_setup(struct csi_priv *priv)
 	struct v4l2_mbus_framefmt *infmt, *outfmt;
 	const struct imx_media_pixfmt *incc;
 	struct v4l2_mbus_config mbus_cfg;
-	struct v4l2_mbus_framefmt if_fmt;
 	struct v4l2_rect crop;
 
 	infmt = &priv->format_mbus[CSI_SINK_PAD];
@@ -679,22 +678,14 @@ static int csi_setup(struct csi_priv *priv)
 		priv->upstream_ep.bus.parallel.flags :
 		priv->upstream_ep.bus.mipi_csi2.flags;
 
-	/*
-	 * we need to pass input frame to CSI interface, but
-	 * with translated field type from output format
-	 */
-	if_fmt = *infmt;
-	if_fmt.field = outfmt->field;
 	crop = priv->crop;
 
 	/*
 	 * if cycles is set, we need to handle this over multiple cycles as
 	 * generic/bayer data
 	 */
-	if (is_parallel_bus(&priv->upstream_ep) && incc->cycles) {
-		if_fmt.width *= incc->cycles;
+	if (is_parallel_bus(&priv->upstream_ep) && incc->cycles)
 		crop.width *= incc->cycles;
-	}
 
 	ipu_csi_set_window(priv->csi, &crop);
 
@@ -702,7 +693,7 @@ static int csi_setup(struct csi_priv *priv)
 			     priv->crop.width == 2 * priv->compose.width,
 			     priv->crop.height == 2 * priv->compose.height);
 
-	ipu_csi_init_interface(priv->csi, &mbus_cfg, &if_fmt);
+	ipu_csi_init_interface(priv->csi, &mbus_cfg, infmt, outfmt);
 
 	ipu_csi_set_dest(priv->csi, priv->dest);
 
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index abbad94e14a1..f44a35192313 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -352,7 +352,8 @@ int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
 struct ipu_csi;
 int ipu_csi_init_interface(struct ipu_csi *csi,
 			   struct v4l2_mbus_config *mbus_cfg,
-			   struct v4l2_mbus_framefmt *mbus_fmt);
+			   struct v4l2_mbus_framefmt *infmt,
+			   struct v4l2_mbus_framefmt *outfmt);
 bool ipu_csi_is_interlaced(struct ipu_csi *csi);
 void ipu_csi_get_window(struct ipu_csi *csi, struct v4l2_rect *w);
 void ipu_csi_set_window(struct ipu_csi *csi, struct v4l2_rect *w);
-- 
2.17.1

Re: [PATCH v4 02/11] gpu: ipu-csi: Swap fields according to input/output field types

[Philipp Zabel]

Hi Steve,

On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
[...]
>  int ipu_csi_init_interface(struct ipu_csi *csi,
>  			   struct v4l2_mbus_config *mbus_cfg,
> -			   struct v4l2_mbus_framefmt *mbus_fmt)
> +			   struct v4l2_mbus_framefmt *infmt,
> +			   struct v4l2_mbus_framefmt *outfmt)
>  {
[...] 
> +		std = V4L2_STD_UNKNOWN;
> +		if (width == 720) {
> +			switch (height) {
> +			case 480:
> +				std = V4L2_STD_NTSC;
> +				break;
> +			case 576:
> +				std = V4L2_STD_PAL;
> +				break;
> +			default:
> +				break;
> +			}
> +		}
> +
> +		if (std == V4L2_STD_UNKNOWN) {
>  			dev_err(csi->ipu->dev,
[...]
> +				"Unsupported interlaced video mode\n");
> +			ret = -EINVAL;
> +			goto out_unlock;
>  		}
[...]
> +
> +		/* framelines for NTSC / PAL */
> +		height = (std & V4L2_STD_525_60) ? 525 : 625;

I think this is a bit convoluted. Instead of initializing std, then
possibly changing it, and then comparing to the inital value, and then
checking it again to determine the new height, why not just:

		if (width == 720 && height == 480) {
			std = V4L2_STD_NTSC;
			height = 525;
		} else if (width == 720 && height == 576) {
			std = V4L2_STD_PAL;
			height = 625;
		} else {
			dev_err(csi->ipu->dev,
				"Unsupported interlaced video mode\n");
			ret = -EINVAL;
			goto out_unlock;
		}

?

>  		break;
>  	case IPU_CSI_CLK_MODE_CCIR1120_PROGRESSIVE_DDR:
>  	case IPU_CSI_CLK_MODE_CCIR1120_PROGRESSIVE_SDR:
> @@ -476,9 +529,10 @@ int ipu_csi_init_interface(struct ipu_csi *csi,
>  	dev_dbg(csi->ipu->dev, "CSI_ACT_FRM_SIZE = 0x%08X\n",
>  		ipu_csi_read(csi, CSI_ACT_FRM_SIZE));
>  
> +out_unlock:
>  	spin_unlock_irqrestore(&csi->lock, flags);
>  
> -	return 0;
> +	return ret;
>  }
>  EXPORT_SYMBOL_GPL(ipu_csi_init_interface);
>  
> diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
> index 4acdd7ae612b..ad66f007d395 100644
> --- a/drivers/staging/media/imx/imx-media-csi.c
> +++ b/drivers/staging/media/imx/imx-media-csi.c
> @@ -666,7 +666,6 @@ static int csi_setup(struct csi_priv *priv)
>  	struct v4l2_mbus_framefmt *infmt, *outfmt;
>  	const struct imx_media_pixfmt *incc;
>  	struct v4l2_mbus_config mbus_cfg;
> -	struct v4l2_mbus_framefmt if_fmt;
>  	struct v4l2_rect crop;
>  
>  	infmt = &priv->format_mbus[CSI_SINK_PAD];
> @@ -679,22 +678,14 @@ static int csi_setup(struct csi_priv *priv)
>  		priv->upstream_ep.bus.parallel.flags :
>  		priv->upstream_ep.bus.mipi_csi2.flags;
>  
> -	/*
> -	 * we need to pass input frame to CSI interface, but
> -	 * with translated field type from output format
> -	 */
> -	if_fmt = *infmt;
> -	if_fmt.field = outfmt->field;
>  	crop = priv->crop;
>  
>  	/*
>  	 * if cycles is set, we need to handle this over multiple cycles as
>  	 * generic/bayer data
>  	 */
> -	if (is_parallel_bus(&priv->upstream_ep) && incc->cycles) {
> -		if_fmt.width *= incc->cycles;

If the input format width passed to ipu_csi_init_interface is not
multiplied by the number of cycles per pixel anymore, width in the
CSI_SENS_FRM_SIZE register will be set to the unmultiplied value from
infmt.
This breaks 779680e2e793 ("media: imx: add support for RGB565_2X8 on
parallel bus").

> +	if (is_parallel_bus(&priv->upstream_ep) && incc->cycles)
>  		crop.width *= incc->cycles;
> -	}
>  
>  	ipu_csi_set_window(priv->csi, &crop);
>  
> @@ -702,7 +693,7 @@ static int csi_setup(struct csi_priv *priv)
>  			     priv->crop.width == 2 * priv->compose.width,
>  			     priv->crop.height == 2 * priv->compose.height);
>  
> -	ipu_csi_init_interface(priv->csi, &mbus_cfg, &if_fmt);
> +	ipu_csi_init_interface(priv->csi, &mbus_cfg, infmt, outfmt);

regards
Philipp

Re: [PATCH v4 02/11] gpu: ipu-csi: Swap fields according to input/output field types

[Steve Longerbeam]

Hi Philipp,


On 10/05/2018 02:44 AM, Philipp Zabel wrote:
> Hi Steve,
>
> On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
>
>
>> +
>> +		/* framelines for NTSC / PAL */
>> +		height = (std & V4L2_STD_525_60) ? 525 : 625;
> I think this is a bit convoluted. Instead of initializing std, then
> possibly changing it, and then comparing to the inital value, and then
> checking it again to determine the new height, why not just:
>
> 		if (width == 720 && height == 480) {
> 			std = V4L2_STD_NTSC;
> 			height = 525;
> 		} else if (width == 720 && height == 576) {
> 			std = V4L2_STD_PAL;
> 			height = 625;
> 		} else {
> 			dev_err(csi->ipu->dev,
> 				"Unsupported interlaced video mode\n");
> 			ret = -EINVAL;
> 			goto out_unlock;
> 		}
>
> ?

Yes that was a bit convoluted, fixed.

>
>>   
>>   	/*
>>   	 * if cycles is set, we need to handle this over multiple cycles as
>>   	 * generic/bayer data
>>   	 */
>> -	if (is_parallel_bus(&priv->upstream_ep) && incc->cycles) {
>> -		if_fmt.width *= incc->cycles;
> If the input format width passed to ipu_csi_init_interface is not
> multiplied by the number of cycles per pixel anymore, width in the
> CSI_SENS_FRM_SIZE register will be set to the unmultiplied value from
> infmt.
> This breaks 779680e2e793 ("media: imx: add support for RGB565_2X8 on
> parallel bus").

Oops, that was a mistake, thanks for catching, fixed.

Steve

[PATCH v4 03/11] gpu: ipu-v3: Add planar support to interlaced scan

[Steve Longerbeam]

To support interlaced scan with planar formats, cpmem SLUV must
be programmed with the correct chroma line stride. For full and
partial planar 4:2:2 (YUV422P, NV16), chroma line stride must
be doubled. For full and partial planar 4:2:0 (YUV420, YVU420, NV12),
chroma line stride must _not_ be doubled, since a single chroma line
is shared by two luma lines.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/gpu/ipu-v3/ipu-cpmem.c              | 26 +++++++++++++++++++--
 drivers/staging/media/imx/imx-ic-prpencvf.c |  3 ++-
 drivers/staging/media/imx/imx-media-csi.c   |  3 ++-
 include/video/imx-ipu-v3.h                  |  3 ++-
 4 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c
index a9d2501500a1..d41df8034c5b 100644
--- a/drivers/gpu/ipu-v3/ipu-cpmem.c
+++ b/drivers/gpu/ipu-v3/ipu-cpmem.c
@@ -273,9 +273,10 @@ void ipu_cpmem_set_uv_offset(struct ipuv3_channel *ch, u32 u_off, u32 v_off)
 }
 EXPORT_SYMBOL_GPL(ipu_cpmem_set_uv_offset);
 
-void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
+void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride,
+			       u32 pixelformat)
 {
-	u32 ilo, sly;
+	u32 ilo, sly, sluv;
 
 	if (stride < 0) {
 		stride = -stride;
@@ -286,9 +287,30 @@ void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
 
 	sly = (stride * 2) - 1;
 
+	switch (pixelformat) {
+	case V4L2_PIX_FMT_YUV420:
+	case V4L2_PIX_FMT_YVU420:
+		sluv = stride / 2 - 1;
+		break;
+	case V4L2_PIX_FMT_NV12:
+		sluv = stride - 1;
+		break;
+	case V4L2_PIX_FMT_YUV422P:
+		sluv = stride - 1;
+		break;
+	case V4L2_PIX_FMT_NV16:
+		sluv = stride * 2 - 1;
+		break;
+	default:
+		sluv = 0;
+		break;
+	}
+
 	ipu_ch_param_write_field(ch, IPU_FIELD_SO, 1);
 	ipu_ch_param_write_field(ch, IPU_FIELD_ILO, ilo);
 	ipu_ch_param_write_field(ch, IPU_FIELD_SLY, sly);
+	if (sluv)
+		ipu_ch_param_write_field(ch, IPU_FIELD_SLUV, sluv);
 };
 EXPORT_SYMBOL_GPL(ipu_cpmem_interlaced_scan);
 
diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index 28f41caba05d..af7224846bd5 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -412,7 +412,8 @@ static int prp_setup_channel(struct prp_priv *priv,
 	if (image.pix.field == V4L2_FIELD_NONE &&
 	    V4L2_FIELD_HAS_BOTH(infmt->field) &&
 	    channel == priv->out_ch)
-		ipu_cpmem_interlaced_scan(channel, image.pix.bytesperline);
+		ipu_cpmem_interlaced_scan(channel, image.pix.bytesperline,
+					  image.pix.pixelformat);
 
 	ret = ipu_ic_task_idma_init(priv->ic, channel,
 				    image.pix.width, image.pix.height,
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index ad66f007d395..5e3aa4f3a1dd 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -512,7 +512,8 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 	if (image.pix.field == V4L2_FIELD_NONE &&
 	    V4L2_FIELD_HAS_BOTH(infmt->field))
 		ipu_cpmem_interlaced_scan(priv->idmac_ch,
-					  image.pix.bytesperline);
+					  image.pix.bytesperline,
+					  image.pix.pixelformat);
 
 	ipu_idmac_set_double_buffer(priv->idmac_ch, true);
 
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index f44a35192313..e888c66b9d9d 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -255,7 +255,8 @@ void ipu_cpmem_set_stride(struct ipuv3_channel *ch, int stride);
 void ipu_cpmem_set_high_priority(struct ipuv3_channel *ch);
 void ipu_cpmem_set_buffer(struct ipuv3_channel *ch, int bufnum, dma_addr_t buf);
 void ipu_cpmem_set_uv_offset(struct ipuv3_channel *ch, u32 u_off, u32 v_off);
-void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride);
+void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride,
+			       u32 pixelformat);
 void ipu_cpmem_set_axi_id(struct ipuv3_channel *ch, u32 id);
 int ipu_cpmem_get_burstsize(struct ipuv3_channel *ch);
 void ipu_cpmem_set_burstsize(struct ipuv3_channel *ch, int burstsize);
-- 
2.17.1

Re: [PATCH v4 03/11] gpu: ipu-v3: Add planar support to interlaced scan

[Philipp Zabel]

On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
> To support interlaced scan with planar formats, cpmem SLUV must
> be programmed with the correct chroma line stride. For full and
> partial planar 4:2:2 (YUV422P, NV16), chroma line stride must
> be doubled. For full and partial planar 4:2:0 (YUV420, YVU420, NV12),
> chroma line stride must _not_ be doubled, since a single chroma line
> is shared by two luma lines.
> 
> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
> ---
>  drivers/gpu/ipu-v3/ipu-cpmem.c              | 26 +++++++++++++++++++--
>  drivers/staging/media/imx/imx-ic-prpencvf.c |  3 ++-
>  drivers/staging/media/imx/imx-media-csi.c   |  3 ++-
>  include/video/imx-ipu-v3.h                  |  3 ++-
>  4 files changed, 30 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c
> index a9d2501500a1..d41df8034c5b 100644
> --- a/drivers/gpu/ipu-v3/ipu-cpmem.c
> +++ b/drivers/gpu/ipu-v3/ipu-cpmem.c
> @@ -273,9 +273,10 @@ void ipu_cpmem_set_uv_offset(struct ipuv3_channel *ch, u32 u_off, u32 v_off)
>  }
>  EXPORT_SYMBOL_GPL(ipu_cpmem_set_uv_offset);
>  
> -void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
> +void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride,
> +			       u32 pixelformat)
>  {
> -	u32 ilo, sly;
> +	u32 ilo, sly, sluv;
>  
>  	if (stride < 0) {
>  		stride = -stride;
> @@ -286,9 +287,30 @@ void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
>  
>  	sly = (stride * 2) - 1;
>  
> +	switch (pixelformat) {
> +	case V4L2_PIX_FMT_YUV420:
> +	case V4L2_PIX_FMT_YVU420:
> +		sluv = stride / 2 - 1;
> +		break;
> +	case V4L2_PIX_FMT_NV12:
> +		sluv = stride - 1;
> +		break;
> +	case V4L2_PIX_FMT_YUV422P:
> +		sluv = stride - 1;
> +		break;
> +	case V4L2_PIX_FMT_NV16:
> +		sluv = stride * 2 - 1;
> +		break;
> +	default:
> +		sluv = 0;
> +		break;
> +	}
> +
>  	ipu_ch_param_write_field(ch, IPU_FIELD_SO, 1);
>  	ipu_ch_param_write_field(ch, IPU_FIELD_ILO, ilo);
>  	ipu_ch_param_write_field(ch, IPU_FIELD_SLY, sly);
> +	if (sluv)
> +		ipu_ch_param_write_field(ch, IPU_FIELD_SLUV, sluv);
>  };
>  EXPORT_SYMBOL_GPL(ipu_cpmem_interlaced_scan);
[...]

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

and

Acked-by: Philipp Zabel <p.zabel@pengutronix.de>

to be merged with the rest of the series via the media tree. I'll take
care not to introduce nontrivial conflicts in imx-drm.

regards
Philipp

Re: [PATCH v4 03/11] gpu: ipu-v3: Add planar support to interlaced scan

[Steve Longerbeam]

On 10/05/2018 02:48 AM, Philipp Zabel wrote:
> On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
>> To support interlaced scan with planar formats, cpmem SLUV must
>> be programmed with the correct chroma line stride. For full and
>> partial planar 4:2:2 (YUV422P, NV16), chroma line stride must
>> be doubled. For full and partial planar 4:2:0 (YUV420, YVU420, NV12),
>> chroma line stride must _not_ be doubled, since a single chroma line
>> is shared by two luma lines.
>>
>> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
>> ---
>>   drivers/gpu/ipu-v3/ipu-cpmem.c              | 26 +++++++++++++++++++--
>>   drivers/staging/media/imx/imx-ic-prpencvf.c |  3 ++-
>>   drivers/staging/media/imx/imx-media-csi.c   |  3 ++-
>>   include/video/imx-ipu-v3.h                  |  3 ++-
>>   4 files changed, 30 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c
>> index a9d2501500a1..d41df8034c5b 100644
>> --- a/drivers/gpu/ipu-v3/ipu-cpmem.c
>> +++ b/drivers/gpu/ipu-v3/ipu-cpmem.c
>> @@ -273,9 +273,10 @@ void ipu_cpmem_set_uv_offset(struct ipuv3_channel *ch, u32 u_off, u32 v_off)
>>   }
>>   EXPORT_SYMBOL_GPL(ipu_cpmem_set_uv_offset);
>>   
>> -void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
>> +void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride,
>> +			       u32 pixelformat)
>>   {
>> -	u32 ilo, sly;
>> +	u32 ilo, sly, sluv;
>>   
>>   	if (stride < 0) {
>>   		stride = -stride;
>> @@ -286,9 +287,30 @@ void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
>>   
>>   	sly = (stride * 2) - 1;
>>   
>> +	switch (pixelformat) {
>> +	case V4L2_PIX_FMT_YUV420:
>> +	case V4L2_PIX_FMT_YVU420:
>> +		sluv = stride / 2 - 1;
>> +		break;
>> +	case V4L2_PIX_FMT_NV12:
>> +		sluv = stride - 1;
>> +		break;
>> +	case V4L2_PIX_FMT_YUV422P:
>> +		sluv = stride - 1;
>> +		break;
>> +	case V4L2_PIX_FMT_NV16:
>> +		sluv = stride * 2 - 1;
>> +		break;
>> +	default:
>> +		sluv = 0;
>> +		break;
>> +	}
>> +
>>   	ipu_ch_param_write_field(ch, IPU_FIELD_SO, 1);
>>   	ipu_ch_param_write_field(ch, IPU_FIELD_ILO, ilo);
>>   	ipu_ch_param_write_field(ch, IPU_FIELD_SLY, sly);
>> +	if (sluv)
>> +		ipu_ch_param_write_field(ch, IPU_FIELD_SLUV, sluv);
>>   };
>>   EXPORT_SYMBOL_GPL(ipu_cpmem_interlaced_scan);
> [...]
>
> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
>
> and
>
> Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
>
> to be merged with the rest of the series via the media tree. I'll take
> care not to introduce nontrivial conflicts in imx-drm.

Ok thanks.

Hans, for v5 I will just include the two IPU patches as before. As Philipp
stated, he is OK with merging them to the media tree (after his ack of
course), along with the rest of the patches in this series.

Steve

[PATCH v4 04/11] media: imx: Fix field negotiation

[Steve Longerbeam]

IDMAC interlaced scan, a.k.a. interweave, should be enabled in the
IDMAC output channels only if the IDMAC output pad field type is
'seq-bt' or 'seq-tb', and field type at the capture interface is
'interlaced*'.

V4L2_FIELD_HAS_BOTH() macro should not be used on the input to determine
enabling interlaced/interweave scan. That macro includes the 'interlaced'
field types, and in those cases the data is already interweaved with
top/bottom field lines.

The CSI will capture whole frames when the source specifies alternate
field mode. So the CSI also enables interweave for alternate input
field type and the field type at capture interface is interlaced.

Fix the logic for setting field type in try_fmt in CSI entity.
The behavior should be:

- No restrictions on field type at sink pad.

- At the output pads, allow sequential fields in TB order, if the sink pad
  field type is sequential or alternate. Otherwise passthrough the field
  type from sink to source pad.

Move this logic to new function csi_try_field().

These changes result in the following allowed field transformations
from CSI sink -> source pads (all other field types at sink are passed
through to source):

seq-tb -> seq-tb
seq-bt -> seq-tb
alternate -> seq-tb

In a future patch, the CSI sink -> source will allow:

seq-tb -> seq-bt
seq-bt -> seq-bt
alternate -> seq-bt

This will require supporting interweave with top/bottom line swapping.
Until then seq-bt is not allowed at the CSI source pad because there is
no way to swap top/bottom lines when interweaving to INTERLACED_BT --
note that despite the name, INTERLACED_BT is top-bottom order in memory.
The BT in this case refers to field dominance: the bottom lines are
older in time than the top lines.

The capture interface device allows selecting IDMAC interweave by
choosing INTERLACED_TB if the CSI/PRPENCVF source pad is seq-tb and
INTERLACED_BT if the source pad is seq-bt (for future support of seq-bt).

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx-ic-prpencvf.c   | 21 ++++--
 drivers/staging/media/imx/imx-media-capture.c | 14 ++++
 drivers/staging/media/imx/imx-media-csi.c     | 64 ++++++++++++++-----
 3 files changed, 76 insertions(+), 23 deletions(-)

diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index af7224846bd5..1a03d4c9d7b8 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -354,12 +354,13 @@ static int prp_setup_channel(struct prp_priv *priv,
 {
 	struct imx_media_video_dev *vdev = priv->vdev;
 	const struct imx_media_pixfmt *outcc;
-	struct v4l2_mbus_framefmt *infmt;
+	struct v4l2_mbus_framefmt *outfmt;
 	unsigned int burst_size;
 	struct ipu_image image;
+	bool interweave;
 	int ret;
 
-	infmt = &priv->format_mbus[PRPENCVF_SINK_PAD];
+	outfmt = &priv->format_mbus[PRPENCVF_SRC_PAD];
 	outcc = vdev->cc;
 
 	ipu_cpmem_zero(channel);
@@ -369,6 +370,15 @@ static int prp_setup_channel(struct prp_priv *priv,
 	image.rect.width = image.pix.width;
 	image.rect.height = image.pix.height;
 
+	/*
+	 * If the field type at capture interface is interlaced, and
+	 * the output IDMAC pad is sequential, enable interweave at
+	 * the IDMAC output channel.
+	 */
+	interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
+		V4L2_FIELD_IS_SEQUENTIAL(outfmt->field) &&
+		channel == priv->out_ch;
+
 	if (rot_swap_width_height) {
 		swap(image.pix.width, image.pix.height);
 		swap(image.rect.width, image.rect.height);
@@ -409,9 +419,7 @@ static int prp_setup_channel(struct prp_priv *priv,
 	if (rot_mode)
 		ipu_cpmem_set_rotation(channel, rot_mode);
 
-	if (image.pix.field == V4L2_FIELD_NONE &&
-	    V4L2_FIELD_HAS_BOTH(infmt->field) &&
-	    channel == priv->out_ch)
+	if (interweave)
 		ipu_cpmem_interlaced_scan(channel, image.pix.bytesperline,
 					  image.pix.pixelformat);
 
@@ -839,8 +847,7 @@ static void prp_try_fmt(struct prp_priv *priv,
 	infmt = __prp_get_fmt(priv, cfg, PRPENCVF_SINK_PAD, sdformat->which);
 
 	if (sdformat->pad == PRPENCVF_SRC_PAD) {
-		if (sdformat->format.field != V4L2_FIELD_NONE)
-			sdformat->format.field = infmt->field;
+		sdformat->format.field = infmt->field;
 
 		prp_bound_align_output(&sdformat->format, infmt,
 				       priv->rot_mode);
diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
index b37e1186eb2f..01ec9443de55 100644
--- a/drivers/staging/media/imx/imx-media-capture.c
+++ b/drivers/staging/media/imx/imx-media-capture.c
@@ -239,6 +239,20 @@ static int capture_try_fmt_vid_cap(struct file *file, void *fh,
 		cc = cc_src;
 	}
 
+	/* allow IDMAC interweave but enforce field order from source */
+	if (V4L2_FIELD_IS_INTERLACED(f->fmt.pix.field)) {
+		switch (fmt_src.format.field) {
+		case V4L2_FIELD_SEQ_TB:
+			fmt_src.format.field = V4L2_FIELD_INTERLACED_TB;
+			break;
+		case V4L2_FIELD_SEQ_BT:
+			fmt_src.format.field = V4L2_FIELD_INTERLACED_BT;
+			break;
+		default:
+			break;
+		}
+	}
+
 	imx_media_mbus_fmt_to_pix_fmt(&f->fmt.pix, &fmt_src.format, cc);
 
 	return 0;
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 5e3aa4f3a1dd..764db0d7c6d3 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -398,16 +398,18 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 	struct imx_media_video_dev *vdev = priv->vdev;
 	const struct imx_media_pixfmt *incc;
 	struct v4l2_mbus_framefmt *infmt;
+	struct v4l2_mbus_framefmt *outfmt;
+	bool passthrough, interweave;
 	struct ipu_image image;
 	u32 passthrough_bits;
 	u32 passthrough_cycles;
 	dma_addr_t phys[2];
-	bool passthrough;
 	u32 burst_size;
 	int ret;
 
 	infmt = &priv->format_mbus[CSI_SINK_PAD];
 	incc = priv->cc[CSI_SINK_PAD];
+	outfmt = &priv->format_mbus[CSI_SRC_PAD_IDMAC];
 
 	ipu_cpmem_zero(priv->idmac_ch);
 
@@ -424,6 +426,14 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 	passthrough = requires_passthrough(&priv->upstream_ep, infmt, incc);
 	passthrough_cycles = 1;
 
+	/*
+	 * If the field type at capture interface is interlaced, and
+	 * the output IDMAC pad is sequential, enable interweave at
+	 * the IDMAC output channel.
+	 */
+	interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
+		V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
+
 	switch (image.pix.pixelformat) {
 	case V4L2_PIX_FMT_SBGGR8:
 	case V4L2_PIX_FMT_SGBRG8:
@@ -509,8 +519,7 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 
 	ipu_smfc_set_burstsize(priv->smfc, burst_size);
 
-	if (image.pix.field == V4L2_FIELD_NONE &&
-	    V4L2_FIELD_HAS_BOTH(infmt->field))
+	if (interweave)
 		ipu_cpmem_interlaced_scan(priv->idmac_ch,
 					  image.pix.bytesperline,
 					  image.pix.pixelformat);
@@ -1300,6 +1309,38 @@ static int csi_get_fmt(struct v4l2_subdev *sd,
 	return ret;
 }
 
+static void csi_try_field(struct csi_priv *priv,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *sdformat)
+{
+	struct v4l2_mbus_framefmt *infmt =
+		__csi_get_fmt(priv, cfg, CSI_SINK_PAD, sdformat->which);
+
+	/* no restrictions on sink pad field type */
+	if (sdformat->pad == CSI_SINK_PAD)
+		return;
+
+	switch (infmt->field) {
+	case V4L2_FIELD_SEQ_TB:
+	case V4L2_FIELD_SEQ_BT:
+	case V4L2_FIELD_ALTERNATE:
+		/*
+		 * If the sink is sequential or alternating fields,
+		 * allow only SEQ_TB at the source.
+		 *
+		 * This driver does not support alternate field mode, and
+		 * the CSI captures a whole frame, so the CSI never presents
+		 * alternate mode at its source pads.
+		 */
+		sdformat->format.field = V4L2_FIELD_SEQ_TB;
+		break;
+	default:
+		/* Passthrough for all other input field types */
+		sdformat->format.field = infmt->field;
+		break;
+	}
+}
+
 static void csi_try_fmt(struct csi_priv *priv,
 			struct v4l2_fwnode_endpoint *upstream_ep,
 			struct v4l2_subdev_pad_config *cfg,
@@ -1339,25 +1380,14 @@ static void csi_try_fmt(struct csi_priv *priv,
 			}
 		}
 
-		if (sdformat->pad == CSI_SRC_PAD_DIRECT ||
-		    sdformat->format.field != V4L2_FIELD_NONE)
-			sdformat->format.field = infmt->field;
-
-		/*
-		 * translate V4L2_FIELD_ALTERNATE to SEQ_TB or SEQ_BT
-		 * depending on input height (assume NTSC top-bottom
-		 * order if 480 lines, otherwise PAL bottom-top order).
-		 */
-		if (sdformat->format.field == V4L2_FIELD_ALTERNATE) {
-			sdformat->format.field =  (infmt->height == 480) ?
-				V4L2_FIELD_SEQ_TB : V4L2_FIELD_SEQ_BT;
-		}
+		csi_try_field(priv, cfg, sdformat);
 
 		/* propagate colorimetry from sink */
 		sdformat->format.colorspace = infmt->colorspace;
 		sdformat->format.xfer_func = infmt->xfer_func;
 		sdformat->format.quantization = infmt->quantization;
 		sdformat->format.ycbcr_enc = infmt->ycbcr_enc;
+
 		break;
 	case CSI_SINK_PAD:
 		v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W,
@@ -1385,6 +1415,8 @@ static void csi_try_fmt(struct csi_priv *priv,
 			sdformat->format.code = (*cc)->codes[0];
 		}
 
+		csi_try_field(priv, cfg, sdformat);
+
 		imx_media_fill_default_mbus_fields(
 			&sdformat->format, infmt,
 			priv->active_output_pad == CSI_SRC_PAD_DIRECT);
-- 
2.17.1

Re: [PATCH v4 04/11] media: imx: Fix field negotiation

[Philipp Zabel]

On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
> IDMAC interlaced scan, a.k.a. interweave, should be enabled in the
> IDMAC output channels only if the IDMAC output pad field type is
> 'seq-bt' or 'seq-tb', and field type at the capture interface is
> 'interlaced*'.
> 
> V4L2_FIELD_HAS_BOTH() macro should not be used on the input to determine
> enabling interlaced/interweave scan. That macro includes the 'interlaced'
> field types, and in those cases the data is already interweaved with
> top/bottom field lines.
> 
> The CSI will capture whole frames when the source specifies alternate
> field mode. So the CSI also enables interweave for alternate input
> field type and the field type at capture interface is interlaced.
> 
> Fix the logic for setting field type in try_fmt in CSI entity.
> The behavior should be:
> 
> - No restrictions on field type at sink pad.
> 
> - At the output pads, allow sequential fields in TB order, if the sink pad
>   field type is sequential or alternate. Otherwise passthrough the field
>   type from sink to source pad.
> 
> Move this logic to new function csi_try_field().
> 
> These changes result in the following allowed field transformations
> from CSI sink -> source pads (all other field types at sink are passed
> through to source):
> 
> seq-tb -> seq-tb
> seq-bt -> seq-tb
> alternate -> seq-tb
> 
> In a future patch, the CSI sink -> source will allow:
> 
> seq-tb -> seq-bt
> seq-bt -> seq-bt
> alternate -> seq-bt
> 
> This will require supporting interweave with top/bottom line swapping.
> Until then seq-bt is not allowed at the CSI source pad because there is
> no way to swap top/bottom lines when interweaving to INTERLACED_BT --
> note that despite the name, INTERLACED_BT is top-bottom order in memory.
> The BT in this case refers to field dominance: the bottom lines are
> older in time than the top lines.
> 
> The capture interface device allows selecting IDMAC interweave by
> choosing INTERLACED_TB if the CSI/PRPENCVF source pad is seq-tb and
> INTERLACED_BT if the source pad is seq-bt (for future support of seq-bt).
> 
> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp

[PATCH v4 05/11] media: imx-csi: Double crop height for alternate fields at sink

[Steve Longerbeam]

If the incoming sink field type is alternate, the reset crop height
and crop height bounds must be set to twice the incoming height,
because in alternate field mode, upstream will report only the
lines for a single field, and the CSI captures the whole frame.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx-media-csi.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 764db0d7c6d3..ca6328f53b75 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1138,6 +1138,8 @@ static void csi_try_crop(struct csi_priv *priv,
 			 struct v4l2_mbus_framefmt *infmt,
 			 struct v4l2_fwnode_endpoint *upstream_ep)
 {
+	u32 in_height;
+
 	crop->width = min_t(__u32, infmt->width, crop->width);
 	if (crop->left + crop->width > infmt->width)
 		crop->left = infmt->width - crop->width;
@@ -1145,6 +1147,10 @@ static void csi_try_crop(struct csi_priv *priv,
 	crop->left &= ~0x3;
 	crop->width &= ~0x7;
 
+	in_height = infmt->height;
+	if (infmt->field == V4L2_FIELD_ALTERNATE)
+		in_height *= 2;
+
 	/*
 	 * FIXME: not sure why yet, but on interlaced bt.656,
 	 * changing the vertical cropping causes loss of vertical
@@ -1154,12 +1160,12 @@ static void csi_try_crop(struct csi_priv *priv,
 	if (upstream_ep->bus_type == V4L2_MBUS_BT656 &&
 	    (V4L2_FIELD_HAS_BOTH(infmt->field) ||
 	     infmt->field == V4L2_FIELD_ALTERNATE)) {
-		crop->height = infmt->height;
-		crop->top = (infmt->height == 480) ? 2 : 0;
+		crop->height = in_height;
+		crop->top = (in_height == 480) ? 2 : 0;
 	} else {
-		crop->height = min_t(__u32, infmt->height, crop->height);
-		if (crop->top + crop->height > infmt->height)
-			crop->top = infmt->height - crop->height;
+		crop->height = min_t(__u32, in_height, crop->height);
+		if (crop->top + crop->height > in_height)
+			crop->top = in_height - crop->height;
 	}
 }
 
@@ -1399,6 +1405,8 @@ static void csi_try_fmt(struct csi_priv *priv,
 		crop->top = 0;
 		crop->width = sdformat->format.width;
 		crop->height = sdformat->format.height;
+		if (sdformat->format.field == V4L2_FIELD_ALTERNATE)
+			crop->height *= 2;
 		csi_try_crop(priv, crop, cfg, &sdformat->format, upstream_ep);
 		compose->left = 0;
 		compose->top = 0;
@@ -1526,6 +1534,8 @@ static int csi_get_selection(struct v4l2_subdev *sd,
 		sel->r.top = 0;
 		sel->r.width = infmt->width;
 		sel->r.height = infmt->height;
+		if (infmt->field == V4L2_FIELD_ALTERNATE)
+			sel->r.height *= 2;
 		break;
 	case V4L2_SEL_TGT_CROP:
 		sel->r = *crop;
-- 
2.17.1

Re: [PATCH v4 05/11] media: imx-csi: Double crop height for alternate fields at sink

[Philipp Zabel]

On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
> If the incoming sink field type is alternate, the reset crop height
> and crop height bounds must be set to twice the incoming height,
> because in alternate field mode, upstream will report only the
> lines for a single field, and the CSI captures the whole frame.
> 
> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp

[PATCH v4 06/11] media: imx: interweave and odd-chroma-row skip are incompatible

[Steve Longerbeam]

If IDMAC interweaving is enabled in a write channel, the channel must
write the odd chroma rows for 4:2:0 formats. Skipping writing the odd
chroma rows produces corrupted captured 4:2:0 images when interweave
is enabled.

Reported-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx-ic-prpencvf.c | 9 +++++++--
 drivers/staging/media/imx/imx-media-csi.c   | 8 ++++++--
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index 1a03d4c9d7b8..cf76b0432371 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -391,12 +391,17 @@ static int prp_setup_channel(struct prp_priv *priv,
 	image.phys0 = addr0;
 	image.phys1 = addr1;
 
-	if (channel == priv->out_ch || channel == priv->rot_out_ch) {
+	/*
+	 * Skip writing U and V components to odd rows in the output
+	 * channels for planar 4:2:0 (but not when enabling IDMAC
+	 * interweaving, they are incompatible).
+	 */
+	if (!interweave && (channel == priv->out_ch ||
+			    channel == priv->rot_out_ch)) {
 		switch (image.pix.pixelformat) {
 		case V4L2_PIX_FMT_YUV420:
 		case V4L2_PIX_FMT_YVU420:
 		case V4L2_PIX_FMT_NV12:
-			/* Skip writing U and V components to odd rows */
 			ipu_cpmem_skip_odd_chroma_rows(channel);
 			break;
 		}
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index ca6328f53b75..4b075bc949de 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -457,8 +457,12 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 			     ((image.pix.width & 0x1f) ?
 			      ((image.pix.width & 0xf) ? 8 : 16) : 32) : 64;
 		passthrough_bits = 16;
-		/* Skip writing U and V components to odd rows */
-		ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
+		/*
+		 * Skip writing U and V components to odd rows (but not
+		 * when enabling IDMAC interweaving, they are incompatible).
+		 */
+		if (!interweave)
+			ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
 		break;
 	case V4L2_PIX_FMT_YUYV:
 	case V4L2_PIX_FMT_UYVY:
-- 
2.17.1

Re: [PATCH v4 06/11] media: imx: interweave and odd-chroma-row skip are incompatible

[Philipp Zabel]

On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
> If IDMAC interweaving is enabled in a write channel, the channel must
> write the odd chroma rows for 4:2:0 formats. Skipping writing the odd
> chroma rows produces corrupted captured 4:2:0 images when interweave
> is enabled.
> 
> Reported-by: Krzysztof Hałasa <khalasa@piap.pl>
> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp

[PATCH v4 07/11] media: imx-csi: Allow skipping odd chroma rows for YVU420

[Steve Longerbeam]

Skip writing U/V components to odd rows for YVU420 in addition to
YUV420 and NV12.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/staging/media/imx/imx-media-csi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 4b075bc949de..6dd53a8e35d2 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -452,6 +452,7 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 		passthrough_bits = 16;
 		break;
 	case V4L2_PIX_FMT_YUV420:
+	case V4L2_PIX_FMT_YVU420:
 	case V4L2_PIX_FMT_NV12:
 		burst_size = (image.pix.width & 0x3f) ?
 			     ((image.pix.width & 0x1f) ?
-- 
2.17.1

Re: [PATCH v4 07/11] media: imx-csi: Allow skipping odd chroma rows for YVU420

[Philipp Zabel]

On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
> Skip writing U/V components to odd rows for YVU420 in addition to
> YUV420 and NV12.
> 
> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> ---
>  drivers/staging/media/imx/imx-media-csi.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
> index 4b075bc949de..6dd53a8e35d2 100644
> --- a/drivers/staging/media/imx/imx-media-csi.c
> +++ b/drivers/staging/media/imx/imx-media-csi.c
> @@ -452,6 +452,7 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
>  		passthrough_bits = 16;
>  		break;
>  	case V4L2_PIX_FMT_YUV420:
> +	case V4L2_PIX_FMT_YVU420:
>  	case V4L2_PIX_FMT_NV12:
>  		burst_size = (image.pix.width & 0x3f) ?
>  			     ((image.pix.width & 0x1f) ?

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp

[PATCH v4 08/11] media: imx: vdic: rely on VDIC for correct field order

[Steve Longerbeam]

prepare_vdi_in_buffers() was setting up the dma pointers as if the
VDIC is always programmed to receive the fields in bottom-top order,
i.e. as if ipu_vdi_set_field_order() only programs BT order in the VDIC.
But that's not true, ipu_vdi_set_field_order() is working correctly.

So fix prepare_vdi_in_buffers() to give the VDIC the fields in whatever
order they were received by the video source, and rely on the VDIC to
sort out which is top and which is bottom.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx-media-vdic.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-vdic.c b/drivers/staging/media/imx/imx-media-vdic.c
index 482250d47e7c..4a890714193e 100644
--- a/drivers/staging/media/imx/imx-media-vdic.c
+++ b/drivers/staging/media/imx/imx-media-vdic.c
@@ -219,26 +219,18 @@ static void __maybe_unused prepare_vdi_in_buffers(struct vdic_priv *priv,
 
 	switch (priv->fieldtype) {
 	case V4L2_FIELD_SEQ_TB:
-		prev_phys = vb2_dma_contig_plane_dma_addr(prev_vb, 0);
-		curr_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0) + fs;
-		next_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0);
-		break;
 	case V4L2_FIELD_SEQ_BT:
 		prev_phys = vb2_dma_contig_plane_dma_addr(prev_vb, 0) + fs;
 		curr_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0);
 		next_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0) + fs;
 		break;
+	case V4L2_FIELD_INTERLACED_TB:
 	case V4L2_FIELD_INTERLACED_BT:
+	case V4L2_FIELD_INTERLACED:
 		prev_phys = vb2_dma_contig_plane_dma_addr(prev_vb, 0) + is;
 		curr_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0);
 		next_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0) + is;
 		break;
-	default:
-		/* assume V4L2_FIELD_INTERLACED_TB */
-		prev_phys = vb2_dma_contig_plane_dma_addr(prev_vb, 0);
-		curr_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0) + is;
-		next_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0);
-		break;
 	}
 
 	ipu_cpmem_set_buffer(priv->vdi_in_ch_p, 0, prev_phys);
-- 
2.17.1

[PATCH v4 09/11] media: imx-csi: Move crop/compose reset after filling default mbus fields

[Steve Longerbeam]

If caller passes un-initialized field type V4L2_FIELD_ANY to CSI
sink pad, the reset CSI crop window would not be correct, because
the crop window depends on a valid input field type. To fix move
the reset of crop and compose windows to after the call to
imx_media_fill_default_mbus_fields().

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx-media-csi.c | 27 ++++++++++++-----------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 6dd53a8e35d2..679295da5dde 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1405,19 +1405,6 @@ static void csi_try_fmt(struct csi_priv *priv,
 				      W_ALIGN, &sdformat->format.height,
 				      MIN_H, MAX_H, H_ALIGN, S_ALIGN);
 
-		/* Reset crop and compose rectangles */
-		crop->left = 0;
-		crop->top = 0;
-		crop->width = sdformat->format.width;
-		crop->height = sdformat->format.height;
-		if (sdformat->format.field == V4L2_FIELD_ALTERNATE)
-			crop->height *= 2;
-		csi_try_crop(priv, crop, cfg, &sdformat->format, upstream_ep);
-		compose->left = 0;
-		compose->top = 0;
-		compose->width = crop->width;
-		compose->height = crop->height;
-
 		*cc = imx_media_find_mbus_format(sdformat->format.code,
 						 CS_SEL_ANY, true);
 		if (!*cc) {
@@ -1433,6 +1420,20 @@ static void csi_try_fmt(struct csi_priv *priv,
 		imx_media_fill_default_mbus_fields(
 			&sdformat->format, infmt,
 			priv->active_output_pad == CSI_SRC_PAD_DIRECT);
+
+		/* Reset crop and compose rectangles */
+		crop->left = 0;
+		crop->top = 0;
+		crop->width = sdformat->format.width;
+		crop->height = sdformat->format.height;
+		if (sdformat->format.field == V4L2_FIELD_ALTERNATE)
+			crop->height *= 2;
+		csi_try_crop(priv, crop, cfg, &sdformat->format, upstream_ep);
+		compose->left = 0;
+		compose->top = 0;
+		compose->width = crop->width;
+		compose->height = crop->height;
+
 		break;
 	}
 }
-- 
2.17.1

Re: [PATCH v4 09/11] media: imx-csi: Move crop/compose reset after filling default mbus fields

[Philipp Zabel]

On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
> If caller passes un-initialized field type V4L2_FIELD_ANY to CSI
> sink pad, the reset CSI crop window would not be correct, because
> the crop window depends on a valid input field type. To fix move
> the reset of crop and compose windows to after the call to
> imx_media_fill_default_mbus_fields().
> 
> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp

[PATCH v4 10/11] media: imx: Allow interweave with top/bottom lines swapped

[Steve Longerbeam]

Allow sequential->interlaced interweaving but with top/bottom
lines swapped to the output buffer.

This can be accomplished by adding one line length to IDMAC output
channel address, with a negative line length for the interlace offset.

This is to allow the seq-bt -> interlaced-bt transformation, where
bottom lines are still dominant (older in time) but with top lines
first in the interweaved output buffer.

With this support, the CSI can now allow seq-bt at its source pads,
e.g. the following transformations are allowed in CSI from sink to
source:

seq-tb -> seq-bt
seq-bt -> seq-bt
alternate -> seq-bt

Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx-ic-prpencvf.c | 17 +++++++-
 drivers/staging/media/imx/imx-media-csi.c   | 46 +++++++++++++++++----
 2 files changed, 53 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index cf76b0432371..1499b0c62d74 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -106,6 +106,8 @@ struct prp_priv {
 	u32 frame_sequence; /* frame sequence counter */
 	bool last_eof;  /* waiting for last EOF at stream off */
 	bool nfb4eof;    /* NFB4EOF encountered during streaming */
+	u32 interweave_offset; /* interweave line offset to swap
+				  top/bottom lines */
 	struct completion last_eof_comp;
 };
 
@@ -235,6 +237,9 @@ static void prp_vb2_buf_done(struct prp_priv *priv, struct ipuv3_channel *ch)
 	if (ipu_idmac_buffer_is_ready(ch, priv->ipu_buf_num))
 		ipu_idmac_clear_buffer(ch, priv->ipu_buf_num);
 
+	if (ch == priv->out_ch)
+		phys += priv->interweave_offset;
+
 	ipu_cpmem_set_buffer(ch, priv->ipu_buf_num, phys);
 }
 
@@ -388,6 +393,13 @@ static int prp_setup_channel(struct prp_priv *priv,
 			(image.pix.width * outcc->bpp) >> 3;
 	}
 
+	priv->interweave_offset = 0;
+
+	if (interweave && image.pix.field == V4L2_FIELD_INTERLACED_BT) {
+		image.rect.top = 1;
+		priv->interweave_offset = image.pix.bytesperline;
+	}
+
 	image.phys0 = addr0;
 	image.phys1 = addr1;
 
@@ -425,7 +437,10 @@ static int prp_setup_channel(struct prp_priv *priv,
 		ipu_cpmem_set_rotation(channel, rot_mode);
 
 	if (interweave)
-		ipu_cpmem_interlaced_scan(channel, image.pix.bytesperline,
+		ipu_cpmem_interlaced_scan(channel,
+					  priv->interweave_offset ?
+					  -image.pix.bytesperline :
+					  image.pix.bytesperline,
 					  image.pix.pixelformat);
 
 	ret = ipu_ic_task_idma_init(priv->ic, channel,
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 679295da5dde..592f7d6edec1 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -114,6 +114,8 @@ struct csi_priv {
 	u32 frame_sequence; /* frame sequence counter */
 	bool last_eof;   /* waiting for last EOF at stream off */
 	bool nfb4eof;    /* NFB4EOF encountered during streaming */
+	u32 interweave_offset; /* interweave line offset to swap
+				  top/bottom lines */
 	struct completion last_eof_comp;
 };
 
@@ -286,7 +288,8 @@ static void csi_vb2_buf_done(struct csi_priv *priv)
 	if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
 		ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
 
-	ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
+	ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num,
+			     phys + priv->interweave_offset);
 }
 
 static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
@@ -396,10 +399,10 @@ static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
 static int csi_idmac_setup_channel(struct csi_priv *priv)
 {
 	struct imx_media_video_dev *vdev = priv->vdev;
+	bool passthrough, interweave, interweave_swap;
 	const struct imx_media_pixfmt *incc;
 	struct v4l2_mbus_framefmt *infmt;
 	struct v4l2_mbus_framefmt *outfmt;
-	bool passthrough, interweave;
 	struct ipu_image image;
 	u32 passthrough_bits;
 	u32 passthrough_cycles;
@@ -433,6 +436,8 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 	 */
 	interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
 		V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
+	interweave_swap = interweave &&
+		image.pix.field == V4L2_FIELD_INTERLACED_BT;
 
 	switch (image.pix.pixelformat) {
 	case V4L2_PIX_FMT_SBGGR8:
@@ -486,15 +491,25 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 	}
 
 	if (passthrough) {
+		priv->interweave_offset = interweave_swap ?
+			image.pix.bytesperline : 0;
 		ipu_cpmem_set_resolution(priv->idmac_ch,
 					 image.rect.width * passthrough_cycles,
 					 image.rect.height);
 		ipu_cpmem_set_stride(priv->idmac_ch, image.pix.bytesperline);
-		ipu_cpmem_set_buffer(priv->idmac_ch, 0, image.phys0);
-		ipu_cpmem_set_buffer(priv->idmac_ch, 1, image.phys1);
+		ipu_cpmem_set_buffer(priv->idmac_ch, 0,
+				     image.phys0 + priv->interweave_offset);
+		ipu_cpmem_set_buffer(priv->idmac_ch, 1,
+				     image.phys1 + priv->interweave_offset);
 		ipu_cpmem_set_format_passthrough(priv->idmac_ch,
 						 passthrough_bits);
 	} else {
+		priv->interweave_offset = 0;
+		if (interweave_swap) {
+			image.rect.top = 1;
+			priv->interweave_offset = image.pix.bytesperline;
+		}
+
 		ret = ipu_cpmem_set_image(priv->idmac_ch, &image);
 		if (ret)
 			goto unsetup_vb2;
@@ -526,6 +541,8 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 
 	if (interweave)
 		ipu_cpmem_interlaced_scan(priv->idmac_ch,
+					  priv->interweave_offset ?
+					  -image.pix.bytesperline :
 					  image.pix.bytesperline,
 					  image.pix.pixelformat);
 
@@ -1334,16 +1351,27 @@ static void csi_try_field(struct csi_priv *priv,
 	switch (infmt->field) {
 	case V4L2_FIELD_SEQ_TB:
 	case V4L2_FIELD_SEQ_BT:
+		/*
+		 * If the user requests sequential at the source pad,
+		 * allow it (along with possibly inverting field order).
+		 * Otherwise passthrough the field type.
+		 */
+		if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
+			sdformat->format.field = infmt->field;
+		break;
 	case V4L2_FIELD_ALTERNATE:
 		/*
-		 * If the sink is sequential or alternating fields,
-		 * allow only SEQ_TB at the source.
-		 *
 		 * This driver does not support alternate field mode, and
 		 * the CSI captures a whole frame, so the CSI never presents
-		 * alternate mode at its source pads.
+		 * alternate mode at its source pads. If user has not
+		 * already requested sequential, translate ALTERNATE at
+		 * sink pad to SEQ_TB or SEQ_BT at the source pad depending
+		 * on input height (assume NTSC BT order if 480 total active
+		 * frame lines, otherwise PAL TB order).
 		 */
-		sdformat->format.field = V4L2_FIELD_SEQ_TB;
+		if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
+			sdformat->format.field = (infmt->height == 480 / 2) ?
+				V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB;
 		break;
 	default:
 		/* Passthrough for all other input field types */
-- 
2.17.1

Re: [PATCH v4 10/11] media: imx: Allow interweave with top/bottom lines swapped

[Philipp Zabel]

Hi Steve,

On Thu, 2018-10-04 at 11:54 -0700, Steve Longerbeam wrote:
> Allow sequential->interlaced interweaving but with top/bottom
> lines swapped to the output buffer.
> 
> This can be accomplished by adding one line length to IDMAC output
> channel address, with a negative line length for the interlace offset.
> 
> This is to allow the seq-bt -> interlaced-bt transformation, where
> bottom lines are still dominant (older in time) but with top lines
> first in the interweaved output buffer.
> 
> With this support, the CSI can now allow seq-bt at its source pads,
> e.g. the following transformations are allowed in CSI from sink to
> source:
> 
> seq-tb -> seq-bt
> seq-bt -> seq-bt
> alternate -> seq-bt
> 
> Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
> ---
>  drivers/staging/media/imx/imx-ic-prpencvf.c | 17 +++++++-
>  drivers/staging/media/imx/imx-media-csi.c   | 46 +++++++++++++++++----
>  2 files changed, 53 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
> index cf76b0432371..1499b0c62d74 100644
> --- a/drivers/staging/media/imx/imx-ic-prpencvf.c
> +++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
> @@ -106,6 +106,8 @@ struct prp_priv {
>  	u32 frame_sequence; /* frame sequence counter */
>  	bool last_eof;  /* waiting for last EOF at stream off */
>  	bool nfb4eof;    /* NFB4EOF encountered during streaming */
> +	u32 interweave_offset; /* interweave line offset to swap
> +				  top/bottom lines */

We have to store this instead of using vdev->fmt.fmt.bytesperline
because this potentially is the pre-rotation stride instead?

>  	struct completion last_eof_comp;
>  };
>  
> @@ -235,6 +237,9 @@ static void prp_vb2_buf_done(struct prp_priv *priv, struct ipuv3_channel *ch)
>  	if (ipu_idmac_buffer_is_ready(ch, priv->ipu_buf_num))
>  		ipu_idmac_clear_buffer(ch, priv->ipu_buf_num);
>  
> +	if (ch == priv->out_ch)
> +		phys += priv->interweave_offset;
> +
>  	ipu_cpmem_set_buffer(ch, priv->ipu_buf_num, phys);
>  }
>  
> @@ -388,6 +393,13 @@ static int prp_setup_channel(struct prp_priv *priv,
>  			(image.pix.width * outcc->bpp) >> 3;
>  	}
>  
> +	priv->interweave_offset = 0;
> +
> +	if (interweave && image.pix.field == V4L2_FIELD_INTERLACED_BT) {
> +		image.rect.top = 1;
> +		priv->interweave_offset = image.pix.bytesperline;
> +	}
> +
>  	image.phys0 = addr0;
>  	image.phys1 = addr1;
>  
> @@ -425,7 +437,10 @@ static int prp_setup_channel(struct prp_priv *priv,
>  		ipu_cpmem_set_rotation(channel, rot_mode);
>  
>  	if (interweave)
> -		ipu_cpmem_interlaced_scan(channel, image.pix.bytesperline,
> +		ipu_cpmem_interlaced_scan(channel,
> +					  priv->interweave_offset ?
> +					  -image.pix.bytesperline :
> +					  image.pix.bytesperline,
>  					  image.pix.pixelformat);
>  
>  	ret = ipu_ic_task_idma_init(priv->ic, channel,
> diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
> index 679295da5dde..592f7d6edec1 100644
> --- a/drivers/staging/media/imx/imx-media-csi.c
> +++ b/drivers/staging/media/imx/imx-media-csi.c
> @@ -114,6 +114,8 @@ struct csi_priv {
>  	u32 frame_sequence; /* frame sequence counter */
>  	bool last_eof;   /* waiting for last EOF at stream off */
>  	bool nfb4eof;    /* NFB4EOF encountered during streaming */
> +	u32 interweave_offset; /* interweave line offset to swap
> +				  top/bottom lines */

This doesn't seem necessary. Since there is no rotation here, the offset
is just vdev->fmt.fmt.pix.bytesperline if interweave_swap is enabled.
Maybe turn this into a bool interweave_swap?

>  	struct completion last_eof_comp;
>  };
>  
> @@ -286,7 +288,8 @@ static void csi_vb2_buf_done(struct csi_priv *priv)
>  	if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
>  		ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
>  
> -	ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
> +	ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num,
> +			     phys + priv->interweave_offset);
>  }
>  
>  static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
> @@ -396,10 +399,10 @@ static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
>  static int csi_idmac_setup_channel(struct csi_priv *priv)
>  {
>  	struct imx_media_video_dev *vdev = priv->vdev;
> +	bool passthrough, interweave, interweave_swap;
>  	const struct imx_media_pixfmt *incc;
>  	struct v4l2_mbus_framefmt *infmt;
>  	struct v4l2_mbus_framefmt *outfmt;
> -	bool passthrough, interweave;
>  	struct ipu_image image;
>  	u32 passthrough_bits;
>  	u32 passthrough_cycles;
> @@ -433,6 +436,8 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
>  	 */
>  	interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
>  		V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
> +	interweave_swap = interweave &&
> +		image.pix.field == V4L2_FIELD_INTERLACED_BT;

Although this could just as well be recalculated in csi_vb2_buf_done.
Apart from that,

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp

Re: [PATCH v4 10/11] media: imx: Allow interweave with top/bottom lines swapped

[Steve Longerbeam]

Hi Philipp,


On 10/05/2018 03:43 AM, Philipp Zabel wrote:
> Hi Steve,
>
> On Thu, 2018-10-04 at 11:54 -0700, Steve Longerbeam wrote:
>> Allow sequential->interlaced interweaving but with top/bottom
>> lines swapped to the output buffer.
>>
>> This can be accomplished by adding one line length to IDMAC output
>> channel address, with a negative line length for the interlace offset.
>>
>> This is to allow the seq-bt -> interlaced-bt transformation, where
>> bottom lines are still dominant (older in time) but with top lines
>> first in the interweaved output buffer.
>>
>> With this support, the CSI can now allow seq-bt at its source pads,
>> e.g. the following transformations are allowed in CSI from sink to
>> source:
>>
>> seq-tb -> seq-bt
>> seq-bt -> seq-bt
>> alternate -> seq-bt
>>
>> Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
>> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
>> ---
>>   drivers/staging/media/imx/imx-ic-prpencvf.c | 17 +++++++-
>>   drivers/staging/media/imx/imx-media-csi.c   | 46 +++++++++++++++++----
>>   2 files changed, 53 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
>> index cf76b0432371..1499b0c62d74 100644
>> --- a/drivers/staging/media/imx/imx-ic-prpencvf.c
>> +++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
>> @@ -106,6 +106,8 @@ struct prp_priv {
>>   	u32 frame_sequence; /* frame sequence counter */
>>   	bool last_eof;  /* waiting for last EOF at stream off */
>>   	bool nfb4eof;    /* NFB4EOF encountered during streaming */
>> +	u32 interweave_offset; /* interweave line offset to swap
>> +				  top/bottom lines */
> We have to store this instead of using vdev->fmt.fmt.bytesperline
> because this potentially is the pre-rotation stride instead?

interweave_offset was used by prp_vb2_buf_done() below, but in fact
that function is passed the non-rotation IDMAC channel (priv->out_ch)
_only_ if rotation is not enabled, so it is actually safe to use
vdev->fmt.fmt.bytesperline for the interweave offset in
prp_vb2_buf_done().

So I've gotten rid of interweave_offset in both imx-ic-prpencvf.c and
imx-media-csi.c, and replaced with a boolean interweave_swap as you
suggested. I agree it is much cleaner.
   

>>
>> diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
>> index 679295da5dde..592f7d6edec1 100644
>> --- a/drivers/staging/media/imx/imx-media-csi.c
>> +++ b/drivers/staging/media/imx/imx-media-csi.c
>> @@ -114,6 +114,8 @@ struct csi_priv {
>>   	u32 frame_sequence; /* frame sequence counter */
>>   	bool last_eof;   /* waiting for last EOF at stream off */
>>   	bool nfb4eof;    /* NFB4EOF encountered during streaming */
>> +	u32 interweave_offset; /* interweave line offset to swap
>> +				  top/bottom lines */
> This doesn't seem necessary. Since there is no rotation here, the offset
> is just vdev->fmt.fmt.pix.bytesperline if interweave_swap is enabled.
> Maybe turn this into a bool interweave_swap?

Agreed.

>
>>   	struct completion last_eof_comp;
>>   };
>>   
>> @@ -286,7 +288,8 @@ static void csi_vb2_buf_done(struct csi_priv *priv)
>>   	if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
>>   		ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
>>   
>> -	ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
>> +	ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num,
>> +			     phys + priv->interweave_offset);
>>   }
>>   
>>   static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
>> @@ -396,10 +399,10 @@ static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
>>   static int csi_idmac_setup_channel(struct csi_priv *priv)
>>   {
>>   	struct imx_media_video_dev *vdev = priv->vdev;
>> +	bool passthrough, interweave, interweave_swap;
>>   	const struct imx_media_pixfmt *incc;
>>   	struct v4l2_mbus_framefmt *infmt;
>>   	struct v4l2_mbus_framefmt *outfmt;
>> -	bool passthrough, interweave;
>>   	struct ipu_image image;
>>   	u32 passthrough_bits;
>>   	u32 passthrough_cycles;
>> @@ -433,6 +436,8 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
>>   	 */
>>   	interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
>>   		V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
>> +	interweave_swap = interweave &&
>> +		image.pix.field == V4L2_FIELD_INTERLACED_BT;
> Although this could just as well be recalculated in csi_vb2_buf_done.

In the future yes, when we add support for alternate mode (I assume
that's what you are getting at?).


> Apart from that,
>
> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

Thanks.

Steve

[PATCH v4 11/11] media: imx.rst: Update doc to reflect fixes to interlaced capture

[Steve Longerbeam]

Also add an example pipeline for unconverted capture with interweave
on SabreAuto.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
Changes since v3:
- none.
Changes since v2:
- expand on idmac interweave behavior in CSI subdev.
- switch second SabreAuto pipeline example to PAL to give
  both NTSC and PAL examples.
- Cleanup some language in various places.
---
 Documentation/media/v4l-drivers/imx.rst | 93 ++++++++++++++++---------
 1 file changed, 60 insertions(+), 33 deletions(-)

diff --git a/Documentation/media/v4l-drivers/imx.rst b/Documentation/media/v4l-drivers/imx.rst
index 65d3d15eb159..1f6279d418ed 100644
--- a/Documentation/media/v4l-drivers/imx.rst
+++ b/Documentation/media/v4l-drivers/imx.rst
@@ -22,8 +22,8 @@ memory. Various dedicated DMA channels exist for both video capture and
 display paths. During transfer, the IDMAC is also capable of vertical
 image flip, 8x8 block transfer (see IRT description), pixel component
 re-ordering (for example UYVY to YUYV) within the same colorspace, and
-even packed <--> planar conversion. It can also perform a simple
-de-interlacing by interleaving even and odd lines during transfer
+packed <--> planar conversion. The IDMAC can also perform a simple
+de-interlacing by interweaving even and odd lines during transfer
 (without motion compensation which requires the VDIC).
 
 The CSI is the backend capture unit that interfaces directly with
@@ -173,15 +173,19 @@ via the SMFC and an IDMAC channel, bypassing IC pre-processing. This
 source pad is routed to a capture device node, with a node name of the
 format "ipuX_csiY capture".
 
-Note that since the IDMAC source pad makes use of an IDMAC channel, it
-can do pixel reordering within the same colorspace. For example, the
+Note that since the IDMAC source pad makes use of an IDMAC channel, the
+CSI can do pixel reordering within the same colorspace. For example, the
 sink pad can take UYVY2X8, but the IDMAC source pad can output YUYV2X8.
 If the sink pad is receiving YUV, the output at the capture device can
 also be converted to a planar YUV format such as YUV420.
 
-It will also perform simple de-interlace without motion compensation,
-which is activated if the sink pad's field type is an interlaced type,
-and the IDMAC source pad field type is set to none.
+The CSI will also perform simple interweave without motion compensation,
+which is activated if the source pad's field type is sequential top-bottom
+or bottom-top or alternate, and the capture interface field type is set
+to interlaced (t-b, b-t, or unqualified interlaced). The capture interface
+will enforce the same field order if the source pad field type is seq-bt
+or seq-tb. However if the source pad's field type is alternate, any
+interlaced type at the capture interface will be accepted.
 
 This subdev can generate the following event when enabling the second
 IDMAC source pad:
@@ -323,14 +327,14 @@ ipuX_vdic
 
 The VDIC carries out motion compensated de-interlacing, with three
 motion compensation modes: low, medium, and high motion. The mode is
-specified with the menu control V4L2_CID_DEINTERLACING_MODE. It has
-two sink pads and a single source pad.
+specified with the menu control V4L2_CID_DEINTERLACING_MODE. The VDIC
+has two sink pads and a single source pad.
 
 The direct sink pad receives from an ipuX_csiY direct pad. With this
 link the VDIC can only operate in high motion mode.
 
 When the IDMAC sink pad is activated, it receives from an output
-or mem2mem device node. With this pipeline, it can also operate
+or mem2mem device node. With this pipeline, the VDIC can also operate
 in low and medium modes, because these modes require receiving
 frames from memory buffers. Note that an output or mem2mem device
 is not implemented yet, so this sink pad currently has no links.
@@ -343,8 +347,8 @@ ipuX_ic_prp
 This is the IC pre-processing entity. It acts as a router, routing
 data from its sink pad to one or both of its source pads.
 
-It has a single sink pad. The sink pad can receive from the ipuX_csiY
-direct pad, or from ipuX_vdic.
+This entity has a single sink pad. The sink pad can receive from the
+ipuX_csiY direct pad, or from ipuX_vdic.
 
 This entity has two source pads. One source pad routes to the
 pre-process encode task entity (ipuX_ic_prpenc), the other to the
@@ -367,8 +371,8 @@ color-space conversion, resizing (downscaling and upscaling),
 horizontal and vertical flip, and 90/270 degree rotation. Flip
 and rotation are provided via standard V4L2 controls.
 
-Like the ipuX_csiY IDMAC source, it can also perform simple de-interlace
-without motion compensation, and pixel reordering.
+Like the ipuX_csiY IDMAC source, this entity can also perform simple
+de-interlace without motion compensation, and pixel reordering.
 
 ipuX_ic_prpvf
 -------------
@@ -378,18 +382,18 @@ pad from ipuX_ic_prp, and a single source pad. The source pad is routed
 to a capture device node, with a node name of the format
 "ipuX_ic_prpvf capture".
 
-It is identical in operation to ipuX_ic_prpenc, with the same resizing
-and CSC operations and flip/rotation controls. It will receive and
-process de-interlaced frames from the ipuX_vdic if ipuX_ic_prp is
+This entity is identical in operation to ipuX_ic_prpenc, with the same
+resizing and CSC operations and flip/rotation controls. It will receive
+and process de-interlaced frames from the ipuX_vdic if ipuX_ic_prp is
 receiving from ipuX_vdic.
 
-Like the ipuX_csiY IDMAC source, it can perform simple de-interlace
-without motion compensation. However, note that if the ipuX_vdic is
-included in the pipeline (ipuX_ic_prp is receiving from ipuX_vdic),
-it's not possible to use simple de-interlace in ipuX_ic_prpvf, since
-the ipuX_vdic has already carried out de-interlacing (with motion
-compensation) and therefore the field type output from ipuX_ic_prp can
-only be none.
+Like the ipuX_csiY IDMAC source, this entity can perform simple
+interweaving without motion compensation. However, note that if the
+ipuX_vdic is included in the pipeline (ipuX_ic_prp is receiving from
+ipuX_vdic), it's not possible to use interweave in ipuX_ic_prpvf,
+since the ipuX_vdic has already carried out de-interlacing (with
+motion compensation) and therefore the field type output from
+ipuX_vdic can only be none (progressive).
 
 Capture Pipelines
 -----------------
@@ -514,10 +518,33 @@ On the SabreAuto, an on-board ADV7180 SD decoder is connected to the
 parallel bus input on the internal video mux to IPU1 CSI0.
 
 The following example configures a pipeline to capture from the ADV7180
-video decoder, assuming NTSC 720x480 input signals, with Motion
-Compensated de-interlacing. Pad field types assume the adv7180 outputs
-"interlaced". $outputfmt can be any format supported by the ipu1_ic_prpvf
-entity at its output pad:
+video decoder, assuming NTSC 720x480 input signals, using simple
+interweave (unconverted and without motion compensation). The adv7180
+must output sequential or alternating fields (field type 'seq-bt' for
+NTSC, or 'alternate'):
+
+.. code-block:: none
+
+   # Setup links
+   media-ctl -l "'adv7180 3-0021':0 -> 'ipu1_csi0_mux':1[1]"
+   media-ctl -l "'ipu1_csi0_mux':2 -> 'ipu1_csi0':0[1]"
+   media-ctl -l "'ipu1_csi0':2 -> 'ipu1_csi0 capture':0[1]"
+   # Configure pads
+   media-ctl -V "'adv7180 3-0021':0 [fmt:UYVY2X8/720x480 field:seq-bt]"
+   media-ctl -V "'ipu1_csi0_mux':2 [fmt:UYVY2X8/720x480]"
+   media-ctl -V "'ipu1_csi0':2 [fmt:AYUV32/720x480]"
+   # Configure "ipu1_csi0 capture" interface (assumed at /dev/video4)
+   v4l2-ctl -d4 --set-fmt-video=field=interlaced_bt
+
+Streaming can then begin on /dev/video4. The v4l2-ctl tool can also be
+used to select any supported YUV pixelformat on /dev/video4.
+
+This example configures a pipeline to capture from the ADV7180
+video decoder, assuming PAL 720x576 input signals, with Motion
+Compensated de-interlacing. The adv7180 must output sequential or
+alternating fields (field type 'seq-tb' for PAL, or 'alternate').
+$outputfmt can be any format supported by the ipu1_ic_prpvf entity
+at its output pad:
 
 .. code-block:: none
 
@@ -529,11 +556,11 @@ entity at its output pad:
    media-ctl -l "'ipu1_ic_prp':2 -> 'ipu1_ic_prpvf':0[1]"
    media-ctl -l "'ipu1_ic_prpvf':1 -> 'ipu1_ic_prpvf capture':0[1]"
    # Configure pads
-   media-ctl -V "'adv7180 3-0021':0 [fmt:UYVY2X8/720x480]"
-   media-ctl -V "'ipu1_csi0_mux':2 [fmt:UYVY2X8/720x480 field:interlaced]"
-   media-ctl -V "'ipu1_csi0':1 [fmt:AYUV32/720x480 field:interlaced]"
-   media-ctl -V "'ipu1_vdic':2 [fmt:AYUV32/720x480 field:none]"
-   media-ctl -V "'ipu1_ic_prp':2 [fmt:AYUV32/720x480 field:none]"
+   media-ctl -V "'adv7180 3-0021':0 [fmt:UYVY2X8/720x576 field:seq-tb]"
+   media-ctl -V "'ipu1_csi0_mux':2 [fmt:UYVY2X8/720x576]"
+   media-ctl -V "'ipu1_csi0':1 [fmt:AYUV32/720x576]"
+   media-ctl -V "'ipu1_vdic':2 [fmt:AYUV32/720x576 field:none]"
+   media-ctl -V "'ipu1_ic_prp':2 [fmt:AYUV32/720x576 field:none]"
    media-ctl -V "'ipu1_ic_prpvf':1 [fmt:$outputfmt field:none]"
 
 Streaming can then begin on the capture device node at
-- 
2.17.1

Re: [PATCH v4 11/11] media: imx.rst: Update doc to reflect fixes to interlaced capture

[Philipp Zabel]

Hi Steve,

On Thu, 2018-10-04 at 11:54 -0700, Steve Longerbeam wrote:
> Also add an example pipeline for unconverted capture with interweave
> on SabreAuto.
> 
> Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
> ---
> Changes since v3:
> - none.
> Changes since v2:
> - expand on idmac interweave behavior in CSI subdev.
> - switch second SabreAuto pipeline example to PAL to give
>   both NTSC and PAL examples.
> - Cleanup some language in various places.
> ---
>  Documentation/media/v4l-drivers/imx.rst | 93 ++++++++++++++++---------
>  1 file changed, 60 insertions(+), 33 deletions(-)
> 
> diff --git a/Documentation/media/v4l-drivers/imx.rst b/Documentation/media/v4l-drivers/imx.rst
> index 65d3d15eb159..1f6279d418ed 100644
> --- a/Documentation/media/v4l-drivers/imx.rst
> +++ b/Documentation/media/v4l-drivers/imx.rst
> @@ -22,8 +22,8 @@ memory. Various dedicated DMA channels exist for both video capture and
>  display paths. During transfer, the IDMAC is also capable of vertical
>  image flip, 8x8 block transfer (see IRT description), pixel component
>  re-ordering (for example UYVY to YUYV) within the same colorspace, and
> -even packed <--> planar conversion. It can also perform a simple
> -de-interlacing by interleaving even and odd lines during transfer
> +packed <--> planar conversion. The IDMAC can also perform a simple
> +de-interlacing by interweaving even and odd lines during transfer
>  (without motion compensation which requires the VDIC).
>  
>  The CSI is the backend capture unit that interfaces directly with
> @@ -173,15 +173,19 @@ via the SMFC and an IDMAC channel, bypassing IC pre-processing. This
>  source pad is routed to a capture device node, with a node name of the
>  format "ipuX_csiY capture".
>  
> -Note that since the IDMAC source pad makes use of an IDMAC channel, it
> -can do pixel reordering within the same colorspace. For example, the
> +Note that since the IDMAC source pad makes use of an IDMAC channel, the
> +CSI can do pixel reordering within the same colorspace. For example, the

This change is unrelated to interlacing, and sounds like the CSI
hardware does pixel reordering, which only partially correct.
The CSI either passes through its input unchanged, or turns any known
input format into either 32-bit ARGB or AYUV.

>  sink pad can take UYVY2X8, but the IDMAC source pad can output YUYV2X8.
>  If the sink pad is receiving YUV, the output at the capture device can
>  also be converted to a planar YUV format such as YUV420.
>  
> -It will also perform simple de-interlace without motion compensation,
> -which is activated if the sink pad's field type is an interlaced type,
> -and the IDMAC source pad field type is set to none.
> +The CSI will also perform simple interweave without motion compensation,

Again the CSI. It is the IDMAC that interweaves, not the CSI.

> +which is activated if the source pad's field type is sequential top-bottom
> +or bottom-top or alternate, and the capture interface field type is set
> +to interlaced (t-b, b-t, or unqualified interlaced). The capture interface
> +will enforce the same field order if the source pad field type is seq-bt
> +or seq-tb. However if the source pad's field type is alternate, any
> +interlaced type at the capture interface will be accepted.

This part is fine, though, as are the following changes. I'd just like
to avoid giving the wrong impression that the CSI does line interweaving
or pixel reordering into the output pixel format.

regards
Philipp

Re: [PATCH v4 11/11] media: imx.rst: Update doc to reflect fixes to interlaced capture

[Steve Longerbeam]

On 10/05/2018 03:52 AM, Philipp Zabel wrote:
> Hi Steve,
>
> On Thu, 2018-10-04 at 11:54 -0700, Steve Longerbeam wrote:
> <snip>
>> +or bottom-top or alternate, and the capture interface field type is set
>> +to interlaced (t-b, b-t, or unqualified interlaced). The capture interface
>> +will enforce the same field order if the source pad field type is seq-bt
>> +or seq-tb. However if the source pad's field type is alternate, any
>> +interlaced type at the capture interface will be accepted.
> This part is fine, though, as are the following changes. I'd just like
> to avoid giving the wrong impression that the CSI does line interweaving
> or pixel reordering into the output pixel format.

Agreed, I made the wording more clear.

Steve