[PATCH 1/3] media: atmel: atmel-isi: add support for mono sensors, GRAY and Y16

[<Eugen.Hristev@microchip.com>]

From: Eugen Hristev <eugen.hristev@microchip.com>

This adds support for GREY and Y16 formats, based on Y10 mbus codes.
Y16 needs to go through preview path in the ISI, with 2 pixels per word,
and it fits the Y16 format. The ISI data lines need to be MSB aligned with
the sensor data lines.
GREY format in 8 bits per pixel is done by dropping the 2 LSB bits
from the Y10 format, and packed as 4 pixels per word.

Suggested-by: Wenyou Yang <wenyou.yang@microchip.com>
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
 drivers/media/platform/atmel/atmel-isi.c | 13 ++++++++++++-
 drivers/media/platform/atmel/atmel-isi.h |  2 ++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platform/atmel/atmel-isi.c
index 428f117..35c1f1a 100644
--- a/drivers/media/platform/atmel/atmel-isi.c
+++ b/drivers/media/platform/atmel/atmel-isi.c
@@ -148,7 +148,8 @@ static void configure_geometry(struct atmel_isi *isi)
 	u32 fourcc = isi->current_fmt->fourcc;
 
 	isi->enable_preview_path = fourcc == V4L2_PIX_FMT_RGB565 ||
-				   fourcc == V4L2_PIX_FMT_RGB32;
+				   fourcc == V4L2_PIX_FMT_RGB32 ||
+				   fourcc == V4L2_PIX_FMT_Y16;
 
 	/* According to sensor's output format to set cfg2 */
 	cfg2 = isi->current_fmt->swap;
@@ -990,6 +991,16 @@ static const struct isi_format isi_formats[] = {
 		.mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
 		.bpp = 2,
 		.swap = ISI_CFG2_YCC_SWAP_MODE_1,
+	}, {
+		.fourcc = V4L2_PIX_FMT_GREY,
+		.mbus_code = MEDIA_BUS_FMT_Y10_1X10,
+		.bpp = 1,
+		.swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
+	}, {
+		.fourcc = V4L2_PIX_FMT_Y16,
+		.mbus_code = MEDIA_BUS_FMT_Y10_1X10,
+		.bpp = 2,
+		.swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
 	},
 };
 
diff --git a/drivers/media/platform/atmel/atmel-isi.h b/drivers/media/platform/atmel/atmel-isi.h
index 47a9108..7ad3895 100644
--- a/drivers/media/platform/atmel/atmel-isi.h
+++ b/drivers/media/platform/atmel/atmel-isi.h
@@ -62,6 +62,8 @@
 #define		ISI_CFG1_THMASK_BEATS_16	(2 << 13)
 
 /* Bitfields in CFG2 */
+#define ISI_CFG2_GS_MODE_2_PIXEL		(0 << 11)
+#define ISI_CFG2_GS_MODE_1_PIXEL		(1 << 11)
 #define ISI_CFG2_GRAYSCALE			(1 << 13)
 #define ISI_CFG2_COL_SPACE_YCbCr		(0 << 15)
 #define ISI_CFG2_COL_SPACE_RGB			(1 << 15)
-- 
2.7.4