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

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

[Eugen.Hristev]

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

[PATCH 2/3] media: atmel: atmel-isi: properly initialize pad_cfg

[Eugen.Hristev]

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

In try_fmt, properly initialize the pad_cfg variable to zeros.
This can be used by various calls from the subdev, so it's better
to have it initialized.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
 drivers/media/platform/atmel/atmel-isi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platform/atmel/atmel-isi.c
index 35c1f1a..59d4c9f 100644
--- a/drivers/media/platform/atmel/atmel-isi.c
+++ b/drivers/media/platform/atmel/atmel-isi.c
@@ -560,7 +560,7 @@ static int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
 {
 	const struct isi_format *isi_fmt;
 	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
-	struct v4l2_subdev_pad_config pad_cfg;
+	struct v4l2_subdev_pad_config pad_cfg = {0};
 	struct v4l2_subdev_format format = {
 		.which = V4L2_SUBDEV_FORMAT_TRY,
 	};
-- 
2.7.4

[PATCH 3/3] media: atmel: atmel-isi: initialize the try_crop for the pads in try_fmt

[Eugen.Hristev]

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

When requesting format from sensor, some sensors call the subdev_get_try_crop
which for ISI was not properly initialized, and this causes errors in
determining proper image resolutions.
To accommodate for this, when trying a format (in try_fmt), first attempt to
obtain the framesize for this format from sensor.
In case this fails, use the maximum ISI width/height as try_crop, otherwise
provide the first size height/width from the sensor.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
 drivers/media/platform/atmel/atmel-isi.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platform/atmel/atmel-isi.c
index 59d4c9f..9b904f5 100644
--- a/drivers/media/platform/atmel/atmel-isi.c
+++ b/drivers/media/platform/atmel/atmel-isi.c
@@ -555,6 +555,30 @@ static const struct isi_format *find_format_by_fourcc(struct atmel_isi *isi,
 	return NULL;
 }
 
+static void isi_try_fse(struct atmel_isi *isi, const struct isi_format *isi_fmt,
+			struct v4l2_subdev_pad_config *pad_cfg)
+{
+	int ret;
+	struct v4l2_subdev_frame_size_enum fse = {
+		.code = isi_fmt->mbus_code,
+		.which = V4L2_SUBDEV_FORMAT_TRY,
+	};
+
+	ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
+			       pad_cfg, &fse);
+	/*
+	 * Attempt to obtain format size from subdev. If not available,
+	 * just use the maximum ISI can receive.
+	 */
+	if (ret) {
+		pad_cfg->try_crop.width = MAX_SUPPORT_WIDTH;
+		pad_cfg->try_crop.height = MAX_SUPPORT_HEIGHT;
+	} else {
+		pad_cfg->try_crop.width = fse.max_width;
+		pad_cfg->try_crop.height = fse.max_height;
+	}
+}
+
 static int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
 		       const struct isi_format **current_fmt)
 {
@@ -577,6 +601,9 @@ static int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
 	pixfmt->height = clamp(pixfmt->height, 0U, MAX_SUPPORT_HEIGHT);
 
 	v4l2_fill_mbus_format(&format.format, pixfmt, isi_fmt->mbus_code);
+
+	isi_try_fse(isi, isi_fmt, &pad_cfg);
+
 	ret = v4l2_subdev_call(isi->entity.subdev, pad, set_fmt,
 			       &pad_cfg, &format);
 	if (ret < 0)
-- 
2.7.4