media: imx274: add support for sensor mode6, 1280x540

Add support for the mode 6 for the sensor, this mode uses
3/8 subsampling and 3 horizontal binning.
Aspect ratio is changed.
Split the bin_ratio variable into two parts, one for
width and one for height, as the ratio is no longer preserved
when doing subsampling in this mode.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/imx274.c

@@ -162,7 +162,8 @@ static const struct regmap_config imx274_regmap_config = {
  * implemented modes.
  *
  * @init_regs: registers to initialize the mode
- * @bin_ratio: downscale factor (e.g. 3 for 3:1 binning)
+ * @wbin_ratio: width downscale factor (e.g. 3 for 1280; 3 = 3840/1280)
+ * @hbin_ratio: height downscale factor (e.g. 3 for 720; 3 = 2160/720)
  * @min_frame_len: Minimum frame length for each mode (see "Frame Rate
  *                 Adjustment (CSI-2)" in the datasheet)
  * @min_SHR: Minimum SHR register value (see "Shutter Setting (CSI-2)" in the
@@ -173,7 +174,8 @@ static const struct regmap_config imx274_regmap_config = {
  */
 struct imx274_mode {
 	const struct reg_8 *init_regs;
-	unsigned int bin_ratio;
+	u8 wbin_ratio;
+	u8 hbin_ratio;
 	int min_frame_len;
 	int min_SHR;
 	int max_fps;
@@ -336,6 +338,46 @@ static const struct reg_8 imx274_mode5_1280x720_raw10[] = {
 	{IMX274_TABLE_END, 0x00}
 };
 
+/*
+ * Vertical 2/8 subsampling horizontal 3 binning
+ * imx274 mode6(refer to datasheet) register configuration with
+ * 1280x540 resolution, raw10 data and mipi four lane output
+ */
+static const struct reg_8 imx274_mode6_1280x540_raw10[] = {
+	{0x3004, 0x04}, /* mode setting */
+	{0x3005, 0x31},
+	{0x3006, 0x00},
+	{0x3007, 0x02}, /* mode setting */
+
+	{0x3018, 0xA2}, /* output XVS, HVS */
+
+	{0x306B, 0x05},
+	{0x30E2, 0x04}, /* mode setting */
+
+	{0x30EE, 0x01},
+	{0x3342, 0x0A},
+	{0x3343, 0x00},
+	{0x3344, 0x16},
+	{0x3345, 0x00},
+	{0x33A6, 0x01},
+	{0x3528, 0x0E},
+	{0x3554, 0x1F},
+	{0x3555, 0x01},
+	{0x3556, 0x01},
+	{0x3557, 0x01},
+	{0x3558, 0x01},
+	{0x3559, 0x00},
+	{0x355A, 0x00},
+	{0x35BA, 0x0E},
+	{0x366A, 0x1B},
+	{0x366B, 0x1A},
+	{0x366C, 0x19},
+	{0x366D, 0x17},
+	{0x3A41, 0x04},
+
+	{IMX274_TABLE_END, 0x00}
+};
+
 /*
  * imx274 first step register configuration for
  * starting stream
@@ -449,7 +491,8 @@ static const struct reg_8 imx274_tp_regs[] = {
 static const struct imx274_mode imx274_modes[] = {
 	{
 		/* mode 1, 4K */
-		.bin_ratio = 1,
+		.wbin_ratio = 1, /* 3840 */
+		.hbin_ratio = 1, /* 2160 */
 		.init_regs = imx274_mode1_3840x2160_raw10,
 		.min_frame_len = 4550,
 		.min_SHR = 12,
@@ -458,7 +501,8 @@ static const struct imx274_mode imx274_modes[] = {
 	},
 	{
 		/* mode 3, 1080p */
-		.bin_ratio = 2,
+		.wbin_ratio = 2, /* 1920 */
+		.hbin_ratio = 2, /* 1080 */
 		.init_regs = imx274_mode3_1920x1080_raw10,
 		.min_frame_len = 2310,
 		.min_SHR = 8,
@@ -467,13 +511,24 @@ static const struct imx274_mode imx274_modes[] = {
 	},
 	{
 		/* mode 5, 720p */
-		.bin_ratio = 3,
+		.wbin_ratio = 3, /* 1280 */
+		.hbin_ratio = 3, /* 720 */
 		.init_regs = imx274_mode5_1280x720_raw10,
 		.min_frame_len = 2310,
 		.min_SHR = 8,
 		.max_fps = 120,
 		.nocpiop = 112,
 	},
+	{
+		/* mode 6, 540p */
+		.wbin_ratio = 3, /* 1280 */
+		.hbin_ratio = 4, /* 540 */
+		.init_regs = imx274_mode6_1280x540_raw10,
+		.min_frame_len = 2310,
+		.min_SHR = 4,
+		.max_fps = 120,
+		.nocpiop = 112,
+	},
 };
 
 /*
@@ -971,12 +1026,13 @@ static int __imx274_change_compose(struct stimx274 *imx274,
 	}
 
 	for (i = 0; i < ARRAY_SIZE(imx274_modes); i++) {
-		unsigned int ratio = imx274_modes[i].bin_ratio;
+		u8 wratio = imx274_modes[i].wbin_ratio;
+		u8 hratio = imx274_modes[i].hbin_ratio;
 
 		int goodness = imx274_binning_goodness(
 			imx274,
-			cur_crop->width / ratio, *width,
-			cur_crop->height / ratio, *height,
+			cur_crop->width / wratio, *width,
+			cur_crop->height / hratio, *height,
 			flags);
 
 		if (goodness >= best_goodness) {
@@ -985,14 +1041,14 @@ static int __imx274_change_compose(struct stimx274 *imx274,
 		}
 	}
 
-	*width = cur_crop->width / best_mode->bin_ratio;
-	*height = cur_crop->height / best_mode->bin_ratio;
+	*width = cur_crop->width / best_mode->wbin_ratio;
+	*height = cur_crop->height / best_mode->hbin_ratio;
 
 	if (which == V4L2_SUBDEV_FORMAT_ACTIVE)
 		imx274->mode = best_mode;
 
-	dev_dbg(dev, "%s: selected %u:1 binning\n",
-		__func__, best_mode->bin_ratio);
+	dev_dbg(dev, "%s: selected %ux%u binning\n",
+		__func__, best_mode->wbin_ratio, best_mode->hbin_ratio);
 
 	tgt_fmt->width = *width;
 	tgt_fmt->height = *height;
@@ -1909,8 +1965,8 @@ static int imx274_probe(struct i2c_client *client)
 	imx274->mode = &imx274_modes[0];
 	imx274->crop.width = IMX274_MAX_WIDTH;
 	imx274->crop.height = IMX274_MAX_HEIGHT;
-	imx274->format.width = imx274->crop.width / imx274->mode->bin_ratio;
-	imx274->format.height = imx274->crop.height / imx274->mode->bin_ratio;
+	imx274->format.width = imx274->crop.width / imx274->mode->wbin_ratio;
+	imx274->format.height = imx274->crop.height / imx274->mode->hbin_ratio;
 	imx274->format.field = V4L2_FIELD_NONE;
 	imx274->format.code = MEDIA_BUS_FMT_SRGGB10_1X10;
 	imx274->format.colorspace = V4L2_COLORSPACE_SRGB;