media: ov5640: Add pixel rate to modes

Add to each mode supported by the sensor the ideal pixel rate, as
defined by Table 2.1 in the chip manual.

The ideal pixel rate will be used to compute the MIPI CSI-2 clock tree.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Adam Ford <aford173@gmail.com> #imx8mm-beacon-kit
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/ov5640.c

@@ -118,6 +118,29 @@ enum ov5640_frame_rate {
 	OV5640_NUM_FRAMERATES,
 };
 
+enum ov5640_pixel_rate_id {
+	OV5640_PIXEL_RATE_168M,
+	OV5640_PIXEL_RATE_148M,
+	OV5640_PIXEL_RATE_124M,
+	OV5640_PIXEL_RATE_96M,
+	OV5640_PIXEL_RATE_48M,
+	OV5640_NUM_PIXEL_RATES,
+};
+
+/*
+ * The chip manual suggests 24/48/96/192 MHz pixel clocks.
+ *
+ * 192MHz exceeds the sysclk limits; use 168MHz as maximum pixel rate for
+ * full resolution mode @15 FPS.
+ */
+static const u32 ov5640_pixel_rates[] = {
+	[OV5640_PIXEL_RATE_168M] = 168000000,
+	[OV5640_PIXEL_RATE_148M] = 148000000,
+	[OV5640_PIXEL_RATE_124M] = 124000000,
+	[OV5640_PIXEL_RATE_96M] = 96000000,
+	[OV5640_PIXEL_RATE_48M] = 48000000,
+};
+
 enum ov5640_format_mux {
 	OV5640_FMT_MUX_YUV422 = 0,
 	OV5640_FMT_MUX_RGB,
@@ -189,6 +212,7 @@ struct reg_value {
 struct ov5640_mode_info {
 	enum ov5640_mode_id id;
 	enum ov5640_downsize_mode dn_mode;
+	enum ov5640_pixel_rate_id pixel_rate;
 	u32 hact;
 	u32 htot;
 	u32 vact;
@@ -565,7 +589,9 @@ static const struct reg_value ov5640_setting_QSXGA_2592_1944[] = {
 
 /* power-on sensor init reg table */
 static const struct ov5640_mode_info ov5640_mode_init_data = {
-	0, SUBSAMPLING, 640, 1896, 480, 984,
+	0, SUBSAMPLING,
+	OV5640_PIXEL_RATE_96M,
+	640, 1896, 480, 984,
 	ov5640_init_setting_30fps_VGA,
 	ARRAY_SIZE(ov5640_init_setting_30fps_VGA),
 	OV5640_30_FPS,
@@ -574,51 +600,61 @@ static const struct ov5640_mode_info ov5640_mode_init_data = {
 static const struct ov5640_mode_info
 ov5640_mode_data[OV5640_NUM_MODES] = {
 	{OV5640_MODE_QQVGA_160_120, SUBSAMPLING,
+	 OV5640_PIXEL_RATE_48M,
 	 160, 1896, 120, 984,
 	 ov5640_setting_QQVGA_160_120,
 	 ARRAY_SIZE(ov5640_setting_QQVGA_160_120),
 	 OV5640_30_FPS},
 	{OV5640_MODE_QCIF_176_144, SUBSAMPLING,
+	 OV5640_PIXEL_RATE_48M,
 	 176, 1896, 144, 984,
 	 ov5640_setting_QCIF_176_144,
 	 ARRAY_SIZE(ov5640_setting_QCIF_176_144),
 	 OV5640_30_FPS},
 	{OV5640_MODE_QVGA_320_240, SUBSAMPLING,
+	 OV5640_PIXEL_RATE_48M,
 	 320, 1896, 240, 984,
 	 ov5640_setting_QVGA_320_240,
 	 ARRAY_SIZE(ov5640_setting_QVGA_320_240),
 	 OV5640_30_FPS},
 	{OV5640_MODE_VGA_640_480, SUBSAMPLING,
+	 OV5640_PIXEL_RATE_48M,
 	 640, 1896, 480, 1080,
 	 ov5640_setting_VGA_640_480,
 	 ARRAY_SIZE(ov5640_setting_VGA_640_480),
 	 OV5640_60_FPS},
 	{OV5640_MODE_NTSC_720_480, SUBSAMPLING,
+	 OV5640_PIXEL_RATE_96M,
 	 720, 1896, 480, 984,
 	 ov5640_setting_NTSC_720_480,
 	 ARRAY_SIZE(ov5640_setting_NTSC_720_480),
 	OV5640_30_FPS},
 	{OV5640_MODE_PAL_720_576, SUBSAMPLING,
+	 OV5640_PIXEL_RATE_96M,
 	 720, 1896, 576, 984,
 	 ov5640_setting_PAL_720_576,
 	 ARRAY_SIZE(ov5640_setting_PAL_720_576),
 	 OV5640_30_FPS},
 	{OV5640_MODE_XGA_1024_768, SUBSAMPLING,
+	 OV5640_PIXEL_RATE_96M,
 	 1024, 1896, 768, 1080,
 	 ov5640_setting_XGA_1024_768,
 	 ARRAY_SIZE(ov5640_setting_XGA_1024_768),
 	 OV5640_30_FPS},
 	{OV5640_MODE_720P_1280_720, SUBSAMPLING,
+	 OV5640_PIXEL_RATE_124M,
 	 1280, 1892, 720, 740,
 	 ov5640_setting_720P_1280_720,
 	 ARRAY_SIZE(ov5640_setting_720P_1280_720),
 	 OV5640_30_FPS},
 	{OV5640_MODE_1080P_1920_1080, SCALING,
+	 OV5640_PIXEL_RATE_148M,
 	 1920, 2500, 1080, 1120,
 	 ov5640_setting_1080P_1920_1080,
 	 ARRAY_SIZE(ov5640_setting_1080P_1920_1080),
 	 OV5640_30_FPS},
 	{OV5640_MODE_QSXGA_2592_1944, SCALING,
+	 OV5640_PIXEL_RATE_168M,
 	 2592, 2844, 1944, 1968,
 	 ov5640_setting_QSXGA_2592_1944,
 	 ARRAY_SIZE(ov5640_setting_QSXGA_2592_1944),
@@ -2743,6 +2779,7 @@ static const struct v4l2_ctrl_ops ov5640_ctrl_ops = {
 
 static int ov5640_init_controls(struct ov5640_dev *sensor)
 {
+	const struct ov5640_mode_info *mode = sensor->current_mode;
 	const struct v4l2_ctrl_ops *ops = &ov5640_ctrl_ops;
 	struct ov5640_ctrls *ctrls = &sensor->ctrls;
 	struct v4l2_ctrl_handler *hdl = &ctrls->handler;
@@ -2755,8 +2792,9 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
 
 	/* Clock related controls */
 	ctrls->pixel_rate = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_PIXEL_RATE,
-					      0, INT_MAX, 1,
-					      ov5640_calc_pixel_rate(sensor));
+			      ov5640_pixel_rates[OV5640_NUM_PIXEL_RATES - 1],
+			      ov5640_pixel_rates[0], 1,
+			      ov5640_pixel_rates[mode->pixel_rate]);
 
 	/* Auto/manual white balance */
 	ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,