Date:   Tue, 20 Sep 2022 10:40:23 +0530
From:   shravan kumar <shravan.chippa@...rochip.com>
To:     <paul.j.murphy@...el.com>, <daniele.alessandrelli@...el.com>,
        <mchehab@...nel.org>
CC:     <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Shravan Chippa" <shravan.chippa@...rochip.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Prakash Battu <Prakash.Battu@...rochip.com>
Subject: [PATCH v4] media: i2c: imx334: support lower bandwidth mode

From: Shravan Chippa <shravan.chippa@...rochip.com>

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

Add support for dynamically selecting 10 bit and 1920x1080
resolutions while leaving the existing configuration as default

CC: Conor Dooley <conor.dooley@...rochip.com>
Signed-off-by: Prakash Battu <Prakash.Battu@...rochip.com>
Signed-off-by: Shravan Chippa <shravan.chippa@...rochip.com>
---

V3 -> V4
- Make the 12 bit and 3840x2160 as default
- Set bus code SRGGB12 if set format fails

V2 -> V3
- Fixed the warning reported by kernel test robot

V1 -> V2
- Addressed the review comment given by Jacopo Mondi,
  Which has bug in imx334_enum_frame_size() loop function,
- Renamed array codes[] to imx334_mbus_codes[]
- Modified supported_modes[] to get higher resolution first

---
 drivers/media/i2c/imx334.c | 302 +++++++++++++++++++++++++++++++++----
 1 file changed, 276 insertions(+), 26 deletions(-)

diff --git a/drivers/media/i2c/imx334.c b/drivers/media/i2c/imx334.c
index 062125501788..df2f1821569e 100644
--- a/drivers/media/i2c/imx334.c
+++ b/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;
 };
 
@@ -147,6 +147,169 @@ static const s64 link_freq[] = {
 	IMX334_LINK_FREQ,
 };
 
+/* Sensor mode registers */
+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, 0x0A},
+	{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 */
 static const struct imx334_reg mode_3840x2160_regs[] = {
 	{0x3000, 0x01},
@@ -243,20 +406,56 @@ static const struct imx334_reg mode_3840x2160_regs[] = {
 	{0x3a00, 0x01},
 };
 
+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},
+};
+
+/*
+ * The supported BUS formats.
+ */
+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 = 560,
+		.vblank = 1170,
+		.vblank_min = 90,
+		.vblank_max = 132840,
+		.pclk = 594000000,
+		.link_freq_idx = 0,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mode_1920x1080_regs),
+			.regs = mode_1920x1080_regs,
+		},
 	},
 };
 
@@ -506,10 +705,10 @@ 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;
 }
@@ -526,15 +725,22 @@ 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)
+	unsigned int i;
+
+	if (fsize->index >= ARRAY_SIZE(supported_modes))
 		return -EINVAL;
 
-	if (fsize->code != supported_mode.code)
+	for (i = 0; i < ARRAY_SIZE(imx334_mbus_codes); ++i) {
+		if (imx334_mbus_codes[i] == fsize->code)
+			break;
+	}
+
+	if (i == ARRAY_SIZE(imx334_mbus_codes))
 		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;
@@ -553,7 +759,7 @@ 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.code = imx334->cur_code;
 	fmt->format.field = V4L2_FIELD_NONE;
 	fmt->format.colorspace = V4L2_COLORSPACE_RAW;
 	fmt->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
@@ -591,6 +797,21 @@ static int imx334_get_pad_format(struct v4l2_subdev *sd,
 	return 0;
 }
 
+static int imx334_get_format_code(struct imx334 *imx334, struct v4l2_subdev_format *fmt)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(imx334_mbus_codes); i++) {
+		if (imx334_mbus_codes[i] == fmt->format.code)
+			break;
+	}
+
+	if (i >= ARRAY_SIZE(imx334_mbus_codes))
+		i = 0;
+
+	return imx334_mbus_codes[i];
+}
+
 /**
  * imx334_set_pad_format() - Set subdevice pad format
  * @sd: pointer to imx334 V4L2 sub-device structure
@@ -609,7 +830,13 @@ static int imx334_set_pad_format(struct v4l2_subdev *sd,
 
 	mutex_lock(&imx334->mutex);
 
-	mode = &supported_mode;
+	imx334->cur_code = imx334_get_format_code(imx334, fmt);
+
+	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);
 
 	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
@@ -617,7 +844,7 @@ static int imx334_set_pad_format(struct v4l2_subdev *sd,
 
 		framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad);
 		*framefmt = fmt->format;
-	} else {
+	} else if (imx334->cur_mode != mode) {
 		ret = imx334_update_controls(imx334, mode);
 		if (!ret)
 			imx334->cur_mode = mode;
@@ -642,11 +869,26 @@ 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
@@ -667,6 +909,13 @@ 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) {
@@ -1037,7 +1286,8 @@ 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);
-- 
2.17.1

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