[PATCH 02/23] media: i2c: imx258: Make image geometry meet sensor requirements

From: git@luigi311.com
To: linux-media@vger.kernel.org
Cc: dave.stevenson@raspberrypi.com, jacopo.mondi@ideasonboard.com,
	mchehab@kernel.org, robh@kernel.org,
	krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
	shawnguo@kernel.org, s.hauer@pengutronix.de,
	kernel@pengutronix.de, festevam@gmail.com,
	sakari.ailus@linux.intel.com, devicetree@vger.kernel.org,
	imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, x@xnux.eu
Subject: [PATCH 02/23] media: i2c: imx258: Make image geometry meet sensor requirements
Date: Wed, 27 Mar 2024 16:20:14 -0600	[thread overview]
Message-ID: <20240327222035.47208-3-git@luigi311.com> (raw)
In-Reply-To: <20240327222035.47208-1-git@luigi311.com>

From: Dave Stevenson <dave.stevenson@raspberrypi.com>

The output image is defined as being 4208x3118 pixels in size.
Y_ADD_STA register was set to 0, and Y_ADD_END to 3118, giving
3119 lines total.

The datasheet lists a requirement for Y_ADD_STA to be a multiple
of a power of 2 depending on binning/scaling mode (2 for full pixel,
4 for x2-bin/scale, 8 for (x2-bin)+(x2-subsample) or x4-bin, or 16
for (x4-bin)+(x2-subsample)).
(Y_ADD_END – Y_ADD_STA + 1) also has to be a similar power of 2.

The current configuration for the full res modes breaks that second
requirement, and we can't increase Y_ADD_STA to 1 to retain exactly
the same field of view as that then breaks the first requirement.
For the binned modes, they are worse off as 3118 is not a multiple of
4.

Increase the main mode to 4208x3120 so that it is the same FOV as the
binned modes, with Y_ADD_STA at 0.
Fix Y_ADD_STA and Y_ADD_END for the binned modes so that they meet the
sensor requirements.

This does change the Bayer order as the default configuration is for
H&V flips to be enabled, so readout is from Y_STA_END to Y_ADD_STA,
and this patch has changed Y_STA_END.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
 drivers/media/i2c/imx258.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index 2dbafd21dd70..4a7048d834c6 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -111,7 +111,7 @@ struct imx258_mode {
 	struct imx258_reg_list reg_list;
 };
 
-/* 4208x3118 needs 1267Mbps/lane, 4 lanes */
+/* 4208x3120 needs 1267Mbps/lane, 4 lanes */
 static const struct imx258_reg mipi_data_rate_1267mbps[] = {
 	{ 0x0301, 0x05 },
 	{ 0x0303, 0x02 },
@@ -148,7 +148,7 @@ static const struct imx258_reg mipi_data_rate_640mbps[] = {
 	{ 0x0823, 0x00 },
 };
 
-static const struct imx258_reg mode_4208x3118_regs[] = {
+static const struct imx258_reg mode_4208x3120_regs[] = {
 	{ 0x0136, 0x13 },
 	{ 0x0137, 0x33 },
 	{ 0x3051, 0x00 },
@@ -210,7 +210,7 @@ static const struct imx258_reg mode_4208x3118_regs[] = {
 	{ 0x0348, 0x10 },
 	{ 0x0349, 0x6F },
 	{ 0x034A, 0x0C },
-	{ 0x034B, 0x2E },
+	{ 0x034B, 0x2F },
 	{ 0x0381, 0x01 },
 	{ 0x0383, 0x01 },
 	{ 0x0385, 0x01 },
@@ -329,7 +329,7 @@ static const struct imx258_reg mode_2104_1560_regs[] = {
 	{ 0x0348, 0x10 },
 	{ 0x0349, 0x6F },
 	{ 0x034A, 0x0C },
-	{ 0x034B, 0x2E },
+	{ 0x034B, 0x2F },
 	{ 0x0381, 0x01 },
 	{ 0x0383, 0x01 },
 	{ 0x0385, 0x01 },
@@ -448,7 +448,7 @@ static const struct imx258_reg mode_1048_780_regs[] = {
 	{ 0x0348, 0x10 },
 	{ 0x0349, 0x6F },
 	{ 0x034A, 0x0C },
-	{ 0x034B, 0x2E },
+	{ 0x034B, 0x2F },
 	{ 0x0381, 0x01 },
 	{ 0x0383, 0x01 },
 	{ 0x0385, 0x01 },
@@ -562,12 +562,12 @@ static const struct imx258_link_freq_config link_freq_configs[] = {
 static const struct imx258_mode supported_modes[] = {
 	{
 		.width = 4208,
-		.height = 3118,
+		.height = 3120,
 		.vts_def = IMX258_VTS_30FPS,
 		.vts_min = IMX258_VTS_30FPS,
 		.reg_list = {
-			.num_of_regs = ARRAY_SIZE(mode_4208x3118_regs),
-			.regs = mode_4208x3118_regs,
+			.num_of_regs = ARRAY_SIZE(mode_4208x3120_regs),
+			.regs = mode_4208x3120_regs,
 		},
 		.link_freq_index = IMX258_LINK_FREQ_1267MBPS,
 	},
@@ -707,7 +707,7 @@ static int imx258_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 	/* Initialize try_fmt */
 	try_fmt->width = supported_modes[0].width;
 	try_fmt->height = supported_modes[0].height;
-	try_fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
+	try_fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
 	try_fmt->field = V4L2_FIELD_NONE;
 
 	return 0;
@@ -819,7 +819,7 @@ static int imx258_enum_mbus_code(struct v4l2_subdev *sd,
 	if (code->index > 0)
 		return -EINVAL;
 
-	code->code = MEDIA_BUS_FMT_SGRBG10_1X10;
+	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
 
 	return 0;
 }
@@ -831,7 +831,7 @@ static int imx258_enum_frame_size(struct v4l2_subdev *sd,
 	if (fse->index >= ARRAY_SIZE(supported_modes))
 		return -EINVAL;
 
-	if (fse->code != MEDIA_BUS_FMT_SGRBG10_1X10)
+	if (fse->code != MEDIA_BUS_FMT_SBGGR10_1X10)
 		return -EINVAL;
 
 	fse->min_width = supported_modes[fse->index].width;
@@ -847,7 +847,7 @@ static void imx258_update_pad_format(const struct imx258_mode *mode,
 {
 	fmt->format.width = mode->width;
 	fmt->format.height = mode->height;
-	fmt->format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
+	fmt->format.code = MEDIA_BUS_FMT_SBGGR10_1X10;
 	fmt->format.field = V4L2_FIELD_NONE;
 }
 
@@ -894,7 +894,7 @@ static int imx258_set_pad_format(struct v4l2_subdev *sd,
 	mutex_lock(&imx258->mutex);
 
 	/* Only one raw bayer(GBRG) order is supported */
-	fmt->format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
+	fmt->format.code = MEDIA_BUS_FMT_SBGGR10_1X10;
 
 	mode = v4l2_find_nearest_size(supported_modes,
 		ARRAY_SIZE(supported_modes), width, height,
-- 
2.42.0

