media: i2c: imx334: support lower bandwidth mode

Some platforms may not be capable of supporting the bandwidth
required for 12 bit or 3840x2160@60 resolutions.

Add support for dynamically selecting 10 bit and 1920x1080@30
resolutions while leaving the existing configuration as default.
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
CC: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Prakash Battu <Prakash.Battu@microchip.com>
Signed-off-by: Shravan Chippa <shravan.chippa@microchip.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/imx334.c

@@ -79,7 +79,6 @@ struct imx334_reg_list {
  * struct imx334_mode - imx334 sensor mode structure
  * @width: Frame width
  * @height: Frame height
- * @code: Format code
  * @hblank: Horizontal blanking in lines
  * @vblank: Vertical blanking in lines
  * @vblank_min: Minimal vertical blanking in lines
@@ -91,7 +90,6 @@ struct imx334_reg_list {
 struct imx334_mode {
 	u32 width;
 	u32 height;
-	u32 code;
 	u32 hblank;
 	u32 vblank;
 	u32 vblank_min;
@@ -119,6 +117,7 @@ struct imx334_mode {
  * @vblank: Vertical blanking in lines
  * @cur_mode: Pointer to current selected sensor mode
  * @mutex: Mutex for serializing sensor controls
+ * @cur_code: current selected format code
  * @streaming: Flag indicating streaming state
  */
 struct imx334 {
@@ -140,6 +139,7 @@ struct imx334 {
 	u32 vblank;
 	const struct imx334_mode *cur_mode;
 	struct mutex mutex;
+	u32 cur_code;
 	bool streaming;
 };
 
@@ -147,7 +147,170 @@ static const s64 link_freq[] = {
 	IMX334_LINK_FREQ,
 };
 
-/* Sensor mode registers */
+/* Sensor mode registers for 1920x1080@30fps */
+static const struct imx334_reg mode_1920x1080_regs[] = {
+	{0x3000, 0x01},
+	{0x3018, 0x04},
+	{0x3030, 0xca},
+	{0x3031, 0x08},
+	{0x3032, 0x00},
+	{0x3034, 0x4c},
+	{0x3035, 0x04},
+	{0x302c, 0xf0},
+	{0x302d, 0x03},
+	{0x302e, 0x80},
+	{0x302f, 0x07},
+	{0x3074, 0xcc},
+	{0x3075, 0x02},
+	{0x308e, 0xcd},
+	{0x308f, 0x02},
+	{0x3076, 0x38},
+	{0x3077, 0x04},
+	{0x3090, 0x38},
+	{0x3091, 0x04},
+	{0x3308, 0x38},
+	{0x3309, 0x04},
+	{0x30C6, 0x00},
+	{0x30c7, 0x00},
+	{0x30ce, 0x00},
+	{0x30cf, 0x00},
+	{0x30d8, 0x18},
+	{0x30d9, 0x0a},
+	{0x304c, 0x00},
+	{0x304e, 0x00},
+	{0x304f, 0x00},
+	{0x3050, 0x00},
+	{0x30b6, 0x00},
+	{0x30b7, 0x00},
+	{0x3116, 0x08},
+	{0x3117, 0x00},
+	{0x31a0, 0x20},
+	{0x31a1, 0x0f},
+	{0x300c, 0x3b},
+	{0x300d, 0x29},
+	{0x314c, 0x29},
+	{0x314d, 0x01},
+	{0x315a, 0x06},
+	{0x3168, 0xa0},
+	{0x316a, 0x7e},
+	{0x319e, 0x02},
+	{0x3199, 0x00},
+	{0x319d, 0x00},
+	{0x31dd, 0x03},
+	{0x3300, 0x00},
+	{0x341c, 0xff},
+	{0x341d, 0x01},
+	{0x3a01, 0x03},
+	{0x3a18, 0x7f},
+	{0x3a19, 0x00},
+	{0x3a1a, 0x37},
+	{0x3a1b, 0x00},
+	{0x3a1c, 0x37},
+	{0x3a1d, 0x00},
+	{0x3a1e, 0xf7},
+	{0x3a1f, 0x00},
+	{0x3a20, 0x3f},
+	{0x3a21, 0x00},
+	{0x3a20, 0x6f},
+	{0x3a21, 0x00},
+	{0x3a20, 0x3f},
+	{0x3a21, 0x00},
+	{0x3a20, 0x5f},
+	{0x3a21, 0x00},
+	{0x3a20, 0x2f},
+	{0x3a21, 0x00},
+	{0x3078, 0x02},
+	{0x3079, 0x00},
+	{0x307a, 0x00},
+	{0x307b, 0x00},
+	{0x3080, 0x02},
+	{0x3081, 0x00},
+	{0x3082, 0x00},
+	{0x3083, 0x00},
+	{0x3088, 0x02},
+	{0x3094, 0x00},
+	{0x3095, 0x00},
+	{0x3096, 0x00},
+	{0x309b, 0x02},
+	{0x309c, 0x00},
+	{0x309d, 0x00},
+	{0x309e, 0x00},
+	{0x30a4, 0x00},
+	{0x30a5, 0x00},
+	{0x3288, 0x21},
+	{0x328a, 0x02},
+	{0x3414, 0x05},
+	{0x3416, 0x18},
+	{0x35Ac, 0x0e},
+	{0x3648, 0x01},
+	{0x364a, 0x04},
+	{0x364c, 0x04},
+	{0x3678, 0x01},
+	{0x367c, 0x31},
+	{0x367e, 0x31},
+	{0x3708, 0x02},
+	{0x3714, 0x01},
+	{0x3715, 0x02},
+	{0x3716, 0x02},
+	{0x3717, 0x02},
+	{0x371c, 0x3d},
+	{0x371d, 0x3f},
+	{0x372c, 0x00},
+	{0x372d, 0x00},
+	{0x372e, 0x46},
+	{0x372f, 0x00},
+	{0x3730, 0x89},
+	{0x3731, 0x00},
+	{0x3732, 0x08},
+	{0x3733, 0x01},
+	{0x3734, 0xfe},
+	{0x3735, 0x05},
+	{0x375d, 0x00},
+	{0x375e, 0x00},
+	{0x375f, 0x61},
+	{0x3760, 0x06},
+	{0x3768, 0x1b},
+	{0x3769, 0x1b},
+	{0x376a, 0x1a},
+	{0x376b, 0x19},
+	{0x376c, 0x18},
+	{0x376d, 0x14},
+	{0x376e, 0x0f},
+	{0x3776, 0x00},
+	{0x3777, 0x00},
+	{0x3778, 0x46},
+	{0x3779, 0x00},
+	{0x377a, 0x08},
+	{0x377b, 0x01},
+	{0x377c, 0x45},
+	{0x377d, 0x01},
+	{0x377e, 0x23},
+	{0x377f, 0x02},
+	{0x3780, 0xd9},
+	{0x3781, 0x03},
+	{0x3782, 0xf5},
+	{0x3783, 0x06},
+	{0x3784, 0xa5},
+	{0x3788, 0x0f},
+	{0x378a, 0xd9},
+	{0x378b, 0x03},
+	{0x378c, 0xeb},
+	{0x378d, 0x05},
+	{0x378e, 0x87},
+	{0x378f, 0x06},
+	{0x3790, 0xf5},
+	{0x3792, 0x43},
+	{0x3794, 0x7a},
+	{0x3796, 0xa1},
+	{0x37b0, 0x37},
+	{0x3e04, 0x0e},
+	{0x30e8, 0x50},
+	{0x30e9, 0x00},
+	{0x3e04, 0x0e},
+	{0x3002, 0x00},
+};
+
+/* Sensor mode registers for 3840x2160@30fps */
 static const struct imx334_reg mode_3840x2160_regs[] = {
 	{0x3000, 0x01},
 	{0x3002, 0x00},
@@ -263,20 +426,53 @@ static const struct imx334_reg mode_3840x2160_regs[] = {
 	{0x3a29, 0x00},
 };
 
+static const struct imx334_reg raw10_framefmt_regs[] = {
+	{0x3050, 0x00},
+	{0x319d, 0x00},
+	{0x341c, 0xff},
+	{0x341d, 0x01},
+};
+
+static const struct imx334_reg raw12_framefmt_regs[] = {
+	{0x3050, 0x01},
+	{0x319d, 0x01},
+	{0x341c, 0x47},
+	{0x341d, 0x00},
+};
+
+static const u32 imx334_mbus_codes[] = {
+	MEDIA_BUS_FMT_SRGGB12_1X12,
+	MEDIA_BUS_FMT_SRGGB10_1X10,
+};
+
 /* Supported sensor mode configurations */
-static const struct imx334_mode supported_mode = {
-	.width = 3840,
-	.height = 2160,
-	.hblank = 560,
-	.vblank = 2340,
-	.vblank_min = 90,
-	.vblank_max = 132840,
-	.pclk = 594000000,
-	.link_freq_idx = 0,
-	.code = MEDIA_BUS_FMT_SRGGB12_1X12,
-	.reg_list = {
-		.num_of_regs = ARRAY_SIZE(mode_3840x2160_regs),
-		.regs = mode_3840x2160_regs,
+static const struct imx334_mode supported_modes[] = {
+	{
+		.width = 3840,
+		.height = 2160,
+		.hblank = 560,
+		.vblank = 2340,
+		.vblank_min = 90,
+		.vblank_max = 132840,
+		.pclk = 594000000,
+		.link_freq_idx = 0,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mode_3840x2160_regs),
+			.regs = mode_3840x2160_regs,
+		},
+	}, {
+		.width = 1920,
+		.height = 1080,
+		.hblank = 2480,
+		.vblank = 1170,
+		.vblank_min = 45,
+		.vblank_max = 132840,
+		.pclk = 297000000,
+		.link_freq_idx = 0,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mode_1920x1080_regs),
+			.regs = mode_1920x1080_regs,
+		},
 	},
 };
 
@@ -518,6 +714,18 @@ static const struct v4l2_ctrl_ops imx334_ctrl_ops = {
 	.s_ctrl = imx334_set_ctrl,
 };
 
+static int imx334_get_format_code(struct imx334 *imx334, u32 code)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(imx334_mbus_codes); i++) {
+		if (imx334_mbus_codes[i] == code)
+			return imx334_mbus_codes[i];
+	}
+
+	return imx334_mbus_codes[0];
+}
+
 /**
  * imx334_enum_mbus_code() - Enumerate V4L2 sub-device mbus codes
  * @sd: pointer to imx334 V4L2 sub-device structure
@@ -530,10 +738,10 @@ static int imx334_enum_mbus_code(struct v4l2_subdev *sd,
 				 struct v4l2_subdev_state *sd_state,
 				 struct v4l2_subdev_mbus_code_enum *code)
 {
-	if (code->index > 0)
+	if (code->index >= ARRAY_SIZE(imx334_mbus_codes))
 		return -EINVAL;
 
-	code->code = supported_mode.code;
+	code->code = imx334_mbus_codes[code->index];
 
 	return 0;
 }
@@ -550,15 +758,20 @@ static int imx334_enum_frame_size(struct v4l2_subdev *sd,
 				  struct v4l2_subdev_state *sd_state,
 				  struct v4l2_subdev_frame_size_enum *fsize)
 {
-	if (fsize->index > 0)
+	struct imx334 *imx334 = to_imx334(sd);
+	u32 code;
+
+	if (fsize->index >= ARRAY_SIZE(supported_modes))
 		return -EINVAL;
 
-	if (fsize->code != supported_mode.code)
+	code = imx334_get_format_code(imx334, fsize->code);
+
+	if (fsize->code != code)
 		return -EINVAL;
 
-	fsize->min_width = supported_mode.width;
+	fsize->min_width = supported_modes[fsize->index].width;
 	fsize->max_width = fsize->min_width;
-	fsize->min_height = supported_mode.height;
+	fsize->min_height = supported_modes[fsize->index].height;
 	fsize->max_height = fsize->min_height;
 
 	return 0;
@@ -577,7 +790,6 @@ static void imx334_fill_pad_format(struct imx334 *imx334,
 {
 	fmt->format.width = mode->width;
 	fmt->format.height = mode->height;
-	fmt->format.code = mode->code;
 	fmt->format.field = V4L2_FIELD_NONE;
 	fmt->format.colorspace = V4L2_COLORSPACE_RAW;
 	fmt->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
@@ -607,6 +819,7 @@ static int imx334_get_pad_format(struct v4l2_subdev *sd,
 		framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad);
 		fmt->format = *framefmt;
 	} else {
+		fmt->format.code = imx334->cur_code;
 		imx334_fill_pad_format(imx334, imx334->cur_mode, fmt);
 	}
 
@@ -633,15 +846,21 @@ static int imx334_set_pad_format(struct v4l2_subdev *sd,
 
 	mutex_lock(&imx334->mutex);
 
-	mode = &supported_mode;
+	mode = v4l2_find_nearest_size(supported_modes,
+				      ARRAY_SIZE(supported_modes),
+				      width, height,
+				      fmt->format.width, fmt->format.height);
+
 	imx334_fill_pad_format(imx334, mode, fmt);
+	fmt->format.code = imx334_get_format_code(imx334, fmt->format.code);
 
 	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
 		struct v4l2_mbus_framefmt *framefmt;
 
 		framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad);
 		*framefmt = fmt->format;
-	} else {
+	} else if (imx334->cur_mode != mode || imx334->cur_code != fmt->format.code) {
+		imx334->cur_code = fmt->format.code;
 		ret = imx334_update_controls(imx334, mode);
 		if (!ret)
 			imx334->cur_mode = mode;
@@ -666,11 +885,26 @@ static int imx334_init_pad_cfg(struct v4l2_subdev *sd,
 	struct v4l2_subdev_format fmt = { 0 };
 
 	fmt.which = sd_state ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
-	imx334_fill_pad_format(imx334, &supported_mode, &fmt);
+	imx334_fill_pad_format(imx334, &supported_modes[0], &fmt);
 
 	return imx334_set_pad_format(sd, sd_state, &fmt);
 }
 
+static int imx334_set_framefmt(struct imx334 *imx334)
+{
+	switch (imx334->cur_code) {
+	case MEDIA_BUS_FMT_SRGGB10_1X10:
+		return imx334_write_regs(imx334, raw10_framefmt_regs,
+					 ARRAY_SIZE(raw10_framefmt_regs));
+
+	case MEDIA_BUS_FMT_SRGGB12_1X12:
+		return imx334_write_regs(imx334, raw12_framefmt_regs,
+					 ARRAY_SIZE(raw12_framefmt_regs));
+	}
+
+	return -EINVAL;
+}
+
 /**
  * imx334_start_streaming() - Start sensor stream
  * @imx334: pointer to imx334 device
@@ -691,6 +925,13 @@ static int imx334_start_streaming(struct imx334 *imx334)
 		return ret;
 	}
 
+	ret = imx334_set_framefmt(imx334);
+	if (ret) {
+		dev_err(imx334->dev, "%s failed to set frame format: %d\n",
+			__func__, ret);
+		return ret;
+	}
+
 	/* Setup handler will write actual exposure and gain */
 	ret =  __v4l2_ctrl_handler_setup(imx334->sd.ctrl_handler);
 	if (ret) {
@@ -1061,7 +1302,8 @@ static int imx334_probe(struct i2c_client *client)
 	}
 
 	/* Set default mode to max resolution */
-	imx334->cur_mode = &supported_mode;
+	imx334->cur_mode = &supported_modes[0];
+	imx334->cur_code = imx334_mbus_codes[0];
 	imx334->vblank = imx334->cur_mode->vblank;
 
 	ret = imx334_init_controls(imx334);