[PATCH v3 0/5] media: i2c: alvium: store frame interval in subdev

[PATCH v3 0/5] media: i2c: alvium: store frame interval in subdev

[Tommaso Merciai]

Hi All,
The goal of this series as suggested by LPinchart is to remove the following
data from alvium_dev struct:

 - struct v4l2_fract frame_interval;
 - u64 dft_fr;
 - u64 min_fr;
 - u64 max_fr;
 - u64 fr;

And use instead the the newly added storage for frame interval in the subdev state.
Last patch fix req_fr check into alvium_s_frame_interval().

This series is made on top of the media_stage tree[1]:
 - media: i2c: mt9m114: use fsleep() in place of udelay() (02d4e62ae245)
 - [1] https://git.linuxtv.org/media_stage.git/log/

Tommaso Merciai (5):
  media: i2c: alvium: removal of dft_fr, min_fr and max_fr
  media: i2c: alvium: remove the fr field of the alvium_dev structure
  media: i2c: alvium: inline set_frame_interval into s_frame_interval
  media: i2c: alvium: store frame interval in subdev state
  media: i2c: alvium: fix req_fr check into alvium_s_frame_interval()

 drivers/media/i2c/alvium-csi2.c | 99 +++++++++------------------------
 drivers/media/i2c/alvium-csi2.h |  5 --
 2 files changed, 27 insertions(+), 77 deletions(-)

-- 
2.34.1

[PATCH v3 1/5] media: i2c: alvium: removal of dft_fr, min_fr and max_fr

[Tommaso Merciai]

The dft_fr, min_fr and max_fr fields of the alvium_dev structure are
only used to pass results from alvium_get_frame_interval() to its
caller. Replace them with function parameters.

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Changes Since v1:
 - Fixed commit body as suggested by LPinchart
 - Fixed alvium_get_frame_interval just return ret as suggested by LPinchart
 - Removed unrelated chnages from the commit as suggested by LPinchart

Changes Since v2:
 - Collected tag from LPinchart

 drivers/media/i2c/alvium-csi2.c | 27 +++++++++------------------
 drivers/media/i2c/alvium-csi2.h |  3 ---
 2 files changed, 9 insertions(+), 21 deletions(-)

diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
index 34ff7fad3877..0dcd69bf9f92 100644
--- a/drivers/media/i2c/alvium-csi2.c
+++ b/drivers/media/i2c/alvium-csi2.c
@@ -1170,25 +1170,19 @@ static int alvium_set_bayer_pattern(struct alvium_dev *alvium,
 	return 0;
 }
 
-static int alvium_get_frame_interval(struct alvium_dev *alvium)
+static int alvium_get_frame_interval(struct alvium_dev *alvium,
+				     u64 *dft_fr, u64 *min_fr, u64 *max_fr)
 {
-	u64 dft_fr, min_fr, max_fr;
 	int ret = 0;
 
 	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_RW,
-		    &dft_fr, &ret);
+		    dft_fr, &ret);
 	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MIN_R,
-		    &min_fr, &ret);
+		    min_fr, &ret);
 	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MAX_R,
-		    &max_fr, &ret);
-	if (ret)
-		return ret;
-
-	alvium->dft_fr = dft_fr;
-	alvium->min_fr = min_fr;
-	alvium->max_fr = max_fr;
+		    max_fr, &ret);
 
-	return 0;
+	return ret;
 }
 
 static int alvium_set_frame_rate(struct alvium_dev *alvium)
@@ -1670,21 +1664,18 @@ static int alvium_set_frame_interval(struct alvium_dev *alvium,
 				     struct v4l2_subdev_frame_interval *fi)
 {
 	struct device *dev = &alvium->i2c_client->dev;
-	u64 req_fr, min_fr, max_fr;
+	u64 req_fr, dft_fr, min_fr, max_fr;
 	int ret;
 
 	if (fi->interval.denominator == 0)
 		return -EINVAL;
 
-	ret = alvium_get_frame_interval(alvium);
+	ret = alvium_get_frame_interval(alvium, &dft_fr, &min_fr, &max_fr);
 	if (ret) {
 		dev_err(dev, "Fail to get frame interval\n");
 		return ret;
 	}
 
-	min_fr = alvium->min_fr;
-	max_fr = alvium->max_fr;
-
 	dev_dbg(dev, "fi->interval.numerator = %d\n",
 		fi->interval.numerator);
 	dev_dbg(dev, "fi->interval.denominator = %d\n",
@@ -1694,7 +1685,7 @@ static int alvium_set_frame_interval(struct alvium_dev *alvium,
 		       fi->interval.numerator);
 
 	if (req_fr >= max_fr && req_fr <= min_fr)
-		req_fr = alvium->dft_fr;
+		req_fr = dft_fr;
 
 	alvium->fr = req_fr;
 	alvium->frame_interval.numerator = fi->interval.numerator;
diff --git a/drivers/media/i2c/alvium-csi2.h b/drivers/media/i2c/alvium-csi2.h
index b85a25169e79..17f0bbbd1839 100644
--- a/drivers/media/i2c/alvium-csi2.h
+++ b/drivers/media/i2c/alvium-csi2.h
@@ -443,9 +443,6 @@ struct alvium_dev {
 
 	struct alvium_mode mode;
 	struct v4l2_fract frame_interval;
-	u64 dft_fr;
-	u64 min_fr;
-	u64 max_fr;
 	u64 fr;
 
 	u8 h_sup_csi_lanes;
-- 
2.34.1

[PATCH v3 2/5] media: i2c: alvium: remove the fr field of the alvium_dev structure

[Tommaso Merciai]

The fr (frame rate) field of the alvium_dev structure is
only used to pass result from alvium_set_frame_interval() to
alvium_set_frame_rate() that writes this info into the hw reg.
Replace it with a function parameter.

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Changes Since v2:
 - Removed req_fr initializzation as suggested by LPinchart
 - Collected tag from LPinchart
 - Fixed commit msg and body as suggested by LPinchart

 drivers/media/i2c/alvium-csi2.c | 24 ++++++++++++------------
 drivers/media/i2c/alvium-csi2.h |  1 -
 2 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
index 0dcd69bf9f92..994372030be9 100644
--- a/drivers/media/i2c/alvium-csi2.c
+++ b/drivers/media/i2c/alvium-csi2.c
@@ -1185,19 +1185,19 @@ static int alvium_get_frame_interval(struct alvium_dev *alvium,
 	return ret;
 }
 
-static int alvium_set_frame_rate(struct alvium_dev *alvium)
+static int alvium_set_frame_rate(struct alvium_dev *alvium, u64 fr)
 {
 	struct device *dev = &alvium->i2c_client->dev;
 	int ret;
 
 	ret = alvium_write_hshake(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_RW,
-				  alvium->fr);
+				  fr);
 	if (ret) {
 		dev_err(dev, "Fail to set frame rate lanes reg\n");
 		return ret;
 	}
 
-	dev_dbg(dev, "set frame rate: %llu us\n", alvium->fr);
+	dev_dbg(dev, "set frame rate: %llu us\n", fr);
 
 	return 0;
 }
@@ -1661,10 +1661,11 @@ static int alvium_g_frame_interval(struct v4l2_subdev *sd,
 }
 
 static int alvium_set_frame_interval(struct alvium_dev *alvium,
-				     struct v4l2_subdev_frame_interval *fi)
+				     struct v4l2_subdev_frame_interval *fi,
+				     u64 *req_fr)
 {
 	struct device *dev = &alvium->i2c_client->dev;
-	u64 req_fr, dft_fr, min_fr, max_fr;
+	u64 dft_fr, min_fr, max_fr;
 	int ret;
 
 	if (fi->interval.denominator == 0)
@@ -1681,13 +1682,12 @@ static int alvium_set_frame_interval(struct alvium_dev *alvium,
 	dev_dbg(dev, "fi->interval.denominator = %d\n",
 		fi->interval.denominator);
 
-	req_fr = (u64)((fi->interval.denominator * USEC_PER_SEC) /
+	*req_fr = (u64)((fi->interval.denominator * USEC_PER_SEC) /
 		       fi->interval.numerator);
 
-	if (req_fr >= max_fr && req_fr <= min_fr)
-		req_fr = dft_fr;
+	if (*req_fr >= max_fr && *req_fr <= min_fr)
+		*req_fr = dft_fr;
 
-	alvium->fr = req_fr;
 	alvium->frame_interval.numerator = fi->interval.numerator;
 	alvium->frame_interval.denominator = fi->interval.denominator;
 
@@ -1699,6 +1699,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
 				   struct v4l2_subdev_frame_interval *fi)
 {
 	struct alvium_dev *alvium = sd_to_alvium(sd);
+	u64 req_fr;
 	int ret;
 
 	/*
@@ -1711,9 +1712,9 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
 	if (alvium->streaming)
 		return -EBUSY;
 
-	ret = alvium_set_frame_interval(alvium, fi);
+	ret = alvium_set_frame_interval(alvium, fi, &req_fr);
 	if (!ret)
-		ret = alvium_set_frame_rate(alvium);
+		ret = alvium_set_frame_rate(alvium, req_fr);
 
 	return ret;
 }
@@ -2273,7 +2274,6 @@ static int alvium_subdev_init(struct alvium_dev *alvium)
 	/* Setup initial frame interval*/
 	alvium->frame_interval.numerator = 1;
 	alvium->frame_interval.denominator = ALVIUM_DEFAULT_FR_HZ;
-	alvium->fr = ALVIUM_DEFAULT_FR_HZ;
 
 	/* Setup the initial mode */
 	alvium->mode.fmt = alvium_csi2_default_fmt;
diff --git a/drivers/media/i2c/alvium-csi2.h b/drivers/media/i2c/alvium-csi2.h
index 17f0bbbd1839..80066ac25047 100644
--- a/drivers/media/i2c/alvium-csi2.h
+++ b/drivers/media/i2c/alvium-csi2.h
@@ -443,7 +443,6 @@ struct alvium_dev {
 
 	struct alvium_mode mode;
 	struct v4l2_fract frame_interval;
-	u64 fr;
 
 	u8 h_sup_csi_lanes;
 	u64 link_freq;
-- 
2.34.1

[PATCH v3 3/5] media: i2c: alvium: inline set_frame_interval into s_frame_interval

[Tommaso Merciai]

Inline alvium_set_frame_interval() into alvium_s_frame_interval().
The alvium_set_frame_interval() is called once only, by
alvium_s_frame_interval(). The latter is a thin wrapper around the
former. Inline the function in its caller to make the code more
readable.

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Changes Since v1:
 - Now this commit is the 3/4 of the series
 - Fixed commit body as suggested by LPinchart

Changes Since v2:
 - Removed req_fr initializzation as suggested by LPinchart
 - Collected tag from LPinchart

 drivers/media/i2c/alvium-csi2.c | 52 ++++++++++++---------------------
 1 file changed, 19 insertions(+), 33 deletions(-)

diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
index 994372030be9..ef137e6a2811 100644
--- a/drivers/media/i2c/alvium-csi2.c
+++ b/drivers/media/i2c/alvium-csi2.c
@@ -1660,14 +1660,25 @@ static int alvium_g_frame_interval(struct v4l2_subdev *sd,
 	return 0;
 }
 
-static int alvium_set_frame_interval(struct alvium_dev *alvium,
-				     struct v4l2_subdev_frame_interval *fi,
-				     u64 *req_fr)
+static int alvium_s_frame_interval(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_state *sd_state,
+				   struct v4l2_subdev_frame_interval *fi)
 {
+	struct alvium_dev *alvium = sd_to_alvium(sd);
 	struct device *dev = &alvium->i2c_client->dev;
-	u64 dft_fr, min_fr, max_fr;
+	u64 req_fr, dft_fr, min_fr, max_fr;
 	int ret;
 
+	/*
+	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
+	 * subdev active state API.
+	 */
+	if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
+		return -EINVAL;
+
+	if (alvium->streaming)
+		return -EBUSY;
+
 	if (fi->interval.denominator == 0)
 		return -EINVAL;
 
@@ -1682,41 +1693,16 @@ static int alvium_set_frame_interval(struct alvium_dev *alvium,
 	dev_dbg(dev, "fi->interval.denominator = %d\n",
 		fi->interval.denominator);
 
-	*req_fr = (u64)((fi->interval.denominator * USEC_PER_SEC) /
+	req_fr = (u64)((fi->interval.denominator * USEC_PER_SEC) /
 		       fi->interval.numerator);
 
-	if (*req_fr >= max_fr && *req_fr <= min_fr)
-		*req_fr = dft_fr;
+	if (req_fr >= max_fr && req_fr <= min_fr)
+		req_fr = dft_fr;
 
 	alvium->frame_interval.numerator = fi->interval.numerator;
 	alvium->frame_interval.denominator = fi->interval.denominator;
 
-	return 0;
-}
-
-static int alvium_s_frame_interval(struct v4l2_subdev *sd,
-				   struct v4l2_subdev_state *sd_state,
-				   struct v4l2_subdev_frame_interval *fi)
-{
-	struct alvium_dev *alvium = sd_to_alvium(sd);
-	u64 req_fr;
-	int ret;
-
-	/*
-	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
-	 * subdev active state API.
-	 */
-	if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
-		return -EINVAL;
-
-	if (alvium->streaming)
-		return -EBUSY;
-
-	ret = alvium_set_frame_interval(alvium, fi, &req_fr);
-	if (!ret)
-		ret = alvium_set_frame_rate(alvium, req_fr);
-
-	return ret;
+	return alvium_set_frame_rate(alvium, req_fr);
 }
 
 static int alvium_enum_mbus_code(struct v4l2_subdev *sd,
-- 
2.34.1

[PATCH v3 4/5] media: i2c: alvium: store frame interval in subdev state

[Tommaso Merciai]

Use the newly added storage for frame interval in the subdev state to
simplify the driver.

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Changes Since v1:
 - Removed FIXME comment and active state check into alvium_s_frame_interval
   as suggested by LPinchart.
 - Fixed call alvium_set_frame_rate() only for active state into alvium_s_frame_interval
   as suggested by LPinchart.

Changes Since v2:
 - Collected tag from LPinchart

 drivers/media/i2c/alvium-csi2.c | 48 +++++++++++----------------------
 drivers/media/i2c/alvium-csi2.h |  1 -
 2 files changed, 15 insertions(+), 34 deletions(-)

diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
index ef137e6a2811..240bf991105e 100644
--- a/drivers/media/i2c/alvium-csi2.c
+++ b/drivers/media/i2c/alvium-csi2.c
@@ -1641,25 +1641,6 @@ static int alvium_hw_init(struct alvium_dev *alvium)
 }
 
 /* --------------- Subdev Operations --------------- */
-
-static int alvium_g_frame_interval(struct v4l2_subdev *sd,
-				   struct v4l2_subdev_state *sd_state,
-				   struct v4l2_subdev_frame_interval *fi)
-{
-	struct alvium_dev *alvium = sd_to_alvium(sd);
-
-	/*
-	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
-	 * subdev active state API.
-	 */
-	if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
-		return -EINVAL;
-
-	fi->interval = alvium->frame_interval;
-
-	return 0;
-}
-
 static int alvium_s_frame_interval(struct v4l2_subdev *sd,
 				   struct v4l2_subdev_state *sd_state,
 				   struct v4l2_subdev_frame_interval *fi)
@@ -1667,15 +1648,9 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
 	struct alvium_dev *alvium = sd_to_alvium(sd);
 	struct device *dev = &alvium->i2c_client->dev;
 	u64 req_fr, dft_fr, min_fr, max_fr;
+	struct v4l2_fract *interval;
 	int ret;
 
-	/*
-	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
-	 * subdev active state API.
-	 */
-	if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
-		return -EINVAL;
-
 	if (alvium->streaming)
 		return -EBUSY;
 
@@ -1699,8 +1674,13 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
 	if (req_fr >= max_fr && req_fr <= min_fr)
 		req_fr = dft_fr;
 
-	alvium->frame_interval.numerator = fi->interval.numerator;
-	alvium->frame_interval.denominator = fi->interval.denominator;
+	interval = v4l2_subdev_state_get_interval(sd_state, 0);
+
+	interval->numerator = fi->interval.numerator;
+	interval->denominator = fi->interval.denominator;
+
+	if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
+		return 0;
 
 	return alvium_set_frame_rate(alvium, req_fr);
 }
@@ -1850,6 +1830,7 @@ static int alvium_init_state(struct v4l2_subdev *sd,
 {
 	struct alvium_dev *alvium = sd_to_alvium(sd);
 	struct alvium_mode *mode = &alvium->mode;
+	struct v4l2_fract *interval;
 	struct v4l2_subdev_format sd_fmt = {
 		.which = V4L2_SUBDEV_FORMAT_TRY,
 		.format = alvium_csi2_default_fmt,
@@ -1867,6 +1848,11 @@ static int alvium_init_state(struct v4l2_subdev *sd,
 	*v4l2_subdev_state_get_crop(state, 0) = sd_crop.rect;
 	*v4l2_subdev_state_get_format(state, 0) = sd_fmt.format;
 
+	/* Setup initial frame interval*/
+	interval = v4l2_subdev_state_get_interval(state, 0);
+	interval->numerator = 1;
+	interval->denominator = ALVIUM_DEFAULT_FR_HZ;
+
 	return 0;
 }
 
@@ -2236,7 +2222,7 @@ static const struct v4l2_subdev_pad_ops alvium_pad_ops = {
 	.set_fmt = alvium_set_fmt,
 	.get_selection = alvium_get_selection,
 	.set_selection = alvium_set_selection,
-	.get_frame_interval = alvium_g_frame_interval,
+	.get_frame_interval = v4l2_subdev_get_frame_interval,
 	.set_frame_interval = alvium_s_frame_interval,
 };
 
@@ -2257,10 +2243,6 @@ static int alvium_subdev_init(struct alvium_dev *alvium)
 	struct v4l2_subdev *sd = &alvium->sd;
 	int ret;
 
-	/* Setup initial frame interval*/
-	alvium->frame_interval.numerator = 1;
-	alvium->frame_interval.denominator = ALVIUM_DEFAULT_FR_HZ;
-
 	/* Setup the initial mode */
 	alvium->mode.fmt = alvium_csi2_default_fmt;
 	alvium->mode.width = alvium_csi2_default_fmt.width;
diff --git a/drivers/media/i2c/alvium-csi2.h b/drivers/media/i2c/alvium-csi2.h
index 80066ac25047..9463f8604fbc 100644
--- a/drivers/media/i2c/alvium-csi2.h
+++ b/drivers/media/i2c/alvium-csi2.h
@@ -442,7 +442,6 @@ struct alvium_dev {
 	s32 inc_sharp;
 
 	struct alvium_mode mode;
-	struct v4l2_fract frame_interval;
 
 	u8 h_sup_csi_lanes;
 	u64 link_freq;
-- 
2.34.1

[PATCH v3 5/5] media: i2c: alvium: fix req_fr check into alvium_s_frame_interval()

[Tommaso Merciai]

Actually req_fr check into alvium_s_frame_interval() is wrong.
In particular req_fr can't be >=max and <= min at the same time.
Fix this using clamp and remove dft_fr parameter from
alvium_get_frame_interval() not more used.

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
---
 drivers/media/i2c/alvium-csi2.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
index 240bf991105e..01111a00902d 100644
--- a/drivers/media/i2c/alvium-csi2.c
+++ b/drivers/media/i2c/alvium-csi2.c
@@ -1171,12 +1171,10 @@ static int alvium_set_bayer_pattern(struct alvium_dev *alvium,
 }
 
 static int alvium_get_frame_interval(struct alvium_dev *alvium,
-				     u64 *dft_fr, u64 *min_fr, u64 *max_fr)
+				     u64 *min_fr, u64 *max_fr)
 {
 	int ret = 0;
 
-	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_RW,
-		    dft_fr, &ret);
 	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MIN_R,
 		    min_fr, &ret);
 	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MAX_R,
@@ -1647,7 +1645,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
 {
 	struct alvium_dev *alvium = sd_to_alvium(sd);
 	struct device *dev = &alvium->i2c_client->dev;
-	u64 req_fr, dft_fr, min_fr, max_fr;
+	u64 req_fr, min_fr, max_fr;
 	struct v4l2_fract *interval;
 	int ret;
 
@@ -1657,7 +1655,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
 	if (fi->interval.denominator == 0)
 		return -EINVAL;
 
-	ret = alvium_get_frame_interval(alvium, &dft_fr, &min_fr, &max_fr);
+	ret = alvium_get_frame_interval(alvium, &min_fr, &max_fr);
 	if (ret) {
 		dev_err(dev, "Fail to get frame interval\n");
 		return ret;
@@ -1670,9 +1668,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
 
 	req_fr = (u64)((fi->interval.denominator * USEC_PER_SEC) /
 		       fi->interval.numerator);
-
-	if (req_fr >= max_fr && req_fr <= min_fr)
-		req_fr = dft_fr;
+	req_fr = clamp(req_fr, min_fr, max_fr);
 
 	interval = v4l2_subdev_state_get_interval(sd_state, 0);
 
-- 
2.34.1

Re: [PATCH v3 5/5] media: i2c: alvium: fix req_fr check into alvium_s_frame_interval()

[Laurent Pinchart]

Hi Tommaso,

Thank you for the patch.

On Wed, Dec 20, 2023 at 01:40:23PM +0100, Tommaso Merciai wrote:
> Actually req_fr check into alvium_s_frame_interval() is wrong.
> In particular req_fr can't be >=max and <= min at the same time.
> Fix this using clamp and remove dft_fr parameter from
> alvium_get_frame_interval() not more used.

The commit message should have explained why clamping is better than
picking a default value, as that's a functional change. If you propose
an updated commit message in a reply, I think Sakari can update the
patch when applying the series to his tree, there's no need for a v4.

> Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  drivers/media/i2c/alvium-csi2.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
> index 240bf991105e..01111a00902d 100644
> --- a/drivers/media/i2c/alvium-csi2.c
> +++ b/drivers/media/i2c/alvium-csi2.c
> @@ -1171,12 +1171,10 @@ static int alvium_set_bayer_pattern(struct alvium_dev *alvium,
>  }
>  
>  static int alvium_get_frame_interval(struct alvium_dev *alvium,
> -				     u64 *dft_fr, u64 *min_fr, u64 *max_fr)
> +				     u64 *min_fr, u64 *max_fr)
>  {
>  	int ret = 0;
>  
> -	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_RW,
> -		    dft_fr, &ret);
>  	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MIN_R,
>  		    min_fr, &ret);
>  	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MAX_R,
> @@ -1647,7 +1645,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
>  {
>  	struct alvium_dev *alvium = sd_to_alvium(sd);
>  	struct device *dev = &alvium->i2c_client->dev;
> -	u64 req_fr, dft_fr, min_fr, max_fr;
> +	u64 req_fr, min_fr, max_fr;
>  	struct v4l2_fract *interval;
>  	int ret;
>  
> @@ -1657,7 +1655,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
>  	if (fi->interval.denominator == 0)
>  		return -EINVAL;
>  
> -	ret = alvium_get_frame_interval(alvium, &dft_fr, &min_fr, &max_fr);
> +	ret = alvium_get_frame_interval(alvium, &min_fr, &max_fr);
>  	if (ret) {
>  		dev_err(dev, "Fail to get frame interval\n");
>  		return ret;
> @@ -1670,9 +1668,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
>  
>  	req_fr = (u64)((fi->interval.denominator * USEC_PER_SEC) /
>  		       fi->interval.numerator);
> -
> -	if (req_fr >= max_fr && req_fr <= min_fr)
> -		req_fr = dft_fr;
> +	req_fr = clamp(req_fr, min_fr, max_fr);
>  
>  	interval = v4l2_subdev_state_get_interval(sd_state, 0);
>  

-- 
Regards,

Laurent Pinchart

Re: [PATCH v3 5/5] media: i2c: alvium: fix req_fr check into alvium_s_frame_interval()

[Tommaso Merciai]

Hi Laurent,

On Wed, Dec 20, 2023 at 03:02:36PM +0200, Laurent Pinchart wrote:
> Hi Tommaso,
> 
> Thank you for the patch.
> 
> On Wed, Dec 20, 2023 at 01:40:23PM +0100, Tommaso Merciai wrote:
> > Actually req_fr check into alvium_s_frame_interval() is wrong.
> > In particular req_fr can't be >=max and <= min at the same time.
> > Fix this using clamp and remove dft_fr parameter from
> > alvium_get_frame_interval() not more used.
> 
> The commit message should have explained why clamping is better than
> picking a default value, as that's a functional change. If you propose
> an updated commit message in a reply, I think Sakari can update the
> patch when applying the series to his tree, there's no need for a v4.

What about:

Actually req_fr check into alvium_s_frame_interval() is wrong.
In particular req_fr can't be >=max and <= min at the same time.
Fix this using clamp and remove dft_fr parameter from
alvium_get_frame_interval() not more used.

Clamp function make sure that if the setted value exceeds the limits is
replaced with min_fr/max_fr instead of setting the value readed back
from the hw.

What do you think?

Thanks & Regards,
Tommaso

> 
> > Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
> > ---
> >  drivers/media/i2c/alvium-csi2.c | 12 ++++--------
> >  1 file changed, 4 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
> > index 240bf991105e..01111a00902d 100644
> > --- a/drivers/media/i2c/alvium-csi2.c
> > +++ b/drivers/media/i2c/alvium-csi2.c
> > @@ -1171,12 +1171,10 @@ static int alvium_set_bayer_pattern(struct alvium_dev *alvium,
> >  }
> >  
> >  static int alvium_get_frame_interval(struct alvium_dev *alvium,
> > -				     u64 *dft_fr, u64 *min_fr, u64 *max_fr)
> > +				     u64 *min_fr, u64 *max_fr)
> >  {
> >  	int ret = 0;
> >  
> > -	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_RW,
> > -		    dft_fr, &ret);
> >  	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MIN_R,
> >  		    min_fr, &ret);
> >  	alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MAX_R,
> > @@ -1647,7 +1645,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
> >  {
> >  	struct alvium_dev *alvium = sd_to_alvium(sd);
> >  	struct device *dev = &alvium->i2c_client->dev;
> > -	u64 req_fr, dft_fr, min_fr, max_fr;
> > +	u64 req_fr, min_fr, max_fr;
> >  	struct v4l2_fract *interval;
> >  	int ret;
> >  
> > @@ -1657,7 +1655,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
> >  	if (fi->interval.denominator == 0)
> >  		return -EINVAL;
> >  
> > -	ret = alvium_get_frame_interval(alvium, &dft_fr, &min_fr, &max_fr);
> > +	ret = alvium_get_frame_interval(alvium, &min_fr, &max_fr);
> >  	if (ret) {
> >  		dev_err(dev, "Fail to get frame interval\n");
> >  		return ret;
> > @@ -1670,9 +1668,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
> >  
> >  	req_fr = (u64)((fi->interval.denominator * USEC_PER_SEC) /
> >  		       fi->interval.numerator);
> > -
> > -	if (req_fr >= max_fr && req_fr <= min_fr)
> > -		req_fr = dft_fr;
> > +	req_fr = clamp(req_fr, min_fr, max_fr);
> >  
> >  	interval = v4l2_subdev_state_get_interval(sd_state, 0);
> >  
> 
> -- 
> Regards,
> 
> Laurent Pinchart

Re: [PATCH v3 5/5] media: i2c: alvium: fix req_fr check into alvium_s_frame_interval()

[Sakari Ailus]

Hi Tommaso,

On Wed, Dec 20, 2023 at 02:52:53PM +0100, Tommaso Merciai wrote:
> Hi Laurent,
> 
> On Wed, Dec 20, 2023 at 03:02:36PM +0200, Laurent Pinchart wrote:
> > Hi Tommaso,
> > 
> > Thank you for the patch.
> > 
> > On Wed, Dec 20, 2023 at 01:40:23PM +0100, Tommaso Merciai wrote:
> > > Actually req_fr check into alvium_s_frame_interval() is wrong.
> > > In particular req_fr can't be >=max and <= min at the same time.
> > > Fix this using clamp and remove dft_fr parameter from
> > > alvium_get_frame_interval() not more used.
> > 
> > The commit message should have explained why clamping is better than
> > picking a default value, as that's a functional change. If you propose
> > an updated commit message in a reply, I think Sakari can update the
> > patch when applying the series to his tree, there's no need for a v4.
> 
> What about:
> 
> Actually req_fr check into alvium_s_frame_interval() is wrong.
> In particular req_fr can't be >=max and <= min at the same time.
> Fix this using clamp and remove dft_fr parameter from
> alvium_get_frame_interval() not more used.
> 
> Clamp function make sure that if the setted value exceeds the limits is
> replaced with min_fr/max_fr instead of setting the value readed back
> from the hw.
> 
> What do you think?

I used this, hopefully it's ok:

media: i2c: alvium: fix req_fr check in alvium_s_frame_interval()

req_fr check in alvium_s_frame_interval() is incorrect. In particular
req_fr can't be >=max and <= min at the same time. Ensure the requested
frame rate remains within the supported range between min_fr and max_fr by
clamping it.

Also remove the unused dft_fr argument of alvium_get_frame_interval().

-- 
Kind regards,

Sakari Ailus

Re: [PATCH v3 5/5] media: i2c: alvium: fix req_fr check into alvium_s_frame_interval()

[Tommaso Merciai]

Hi Sakari,
Sorry for delay.

On Wed, Feb 14, 2024 at 11:14:35AM +0000, Sakari Ailus wrote:
> Hi Tommaso,
> 
> On Wed, Dec 20, 2023 at 02:52:53PM +0100, Tommaso Merciai wrote:
> > Hi Laurent,
> > 
> > On Wed, Dec 20, 2023 at 03:02:36PM +0200, Laurent Pinchart wrote:
> > > Hi Tommaso,
> > > 
> > > Thank you for the patch.
> > > 
> > > On Wed, Dec 20, 2023 at 01:40:23PM +0100, Tommaso Merciai wrote:
> > > > Actually req_fr check into alvium_s_frame_interval() is wrong.
> > > > In particular req_fr can't be >=max and <= min at the same time.
> > > > Fix this using clamp and remove dft_fr parameter from
> > > > alvium_get_frame_interval() not more used.
> > > 
> > > The commit message should have explained why clamping is better than
> > > picking a default value, as that's a functional change. If you propose
> > > an updated commit message in a reply, I think Sakari can update the
> > > patch when applying the series to his tree, there's no need for a v4.
> > 
> > What about:
> > 
> > Actually req_fr check into alvium_s_frame_interval() is wrong.
> > In particular req_fr can't be >=max and <= min at the same time.
> > Fix this using clamp and remove dft_fr parameter from
> > alvium_get_frame_interval() not more used.
> > 
> > Clamp function make sure that if the setted value exceeds the limits is
> > replaced with min_fr/max_fr instead of setting the value readed back
> > from the hw.
> > 
> > What do you think?
> 
> I used this, hopefully it's ok:
> 
> media: i2c: alvium: fix req_fr check in alvium_s_frame_interval()
> 
> req_fr check in alvium_s_frame_interval() is incorrect. In particular
> req_fr can't be >=max and <= min at the same time. Ensure the requested
> frame rate remains within the supported range between min_fr and max_fr by
> clamping it.
> 
> Also remove the unused dft_fr argument of alvium_get_frame_interval().

Looks good to me! :)
Thanks for this.

Regards,
Tommaso


> 
> -- 
> Kind regards,
> 
> Sakari Ailus