Re: [PATCH] media: i2c: imx334: support lower bandwidth mode

From: Jacopo Mondi
Date: Mon Aug 22 2022 - 11:53:14 EST

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In reply to: Shravan.Chippa: "RE: [PATCH] media: i2c: imx334: support lower bandwidth mode"
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Hello Shravan,

On Thu, Jul 28, 2022 at 12:00:44PM +0530, shravan kumar wrote:
> From: Shravan Chippa <shravan.chippa@xxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxx>
> Signed-off-by: Prakash Battu <Prakash.Battu@xxxxxxxxxxxxx>
> Signed-off-by: Shravan Chippa <shravan.chippa@xxxxxxxxxxxxx>
> ---
> drivers/media/i2c/imx334.c | 306 +++++++++++++++++++++++++++++++++----
> 1 file changed, 279 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/media/i2c/imx334.c b/drivers/media/i2c/imx334.c
> index 062125501788..d1fa4c4d4d9e 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 +406,57 @@ 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},
> +};
> +
> +/*
>
> + */
> +static const u32 codes[] = {

Just "codes" is a little vague ? What about imx334_mbus_codes[] ?

> + MEDIA_BUS_FMT_SRGGB10_1X10,
> + MEDIA_BUS_FMT_SRGGB12_1X12,
> +};
> +
> /* 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 = 1920,
> + .height = 1080,
> + .hblank = 280,
> + .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,
> + },
> + },
> + {
> + .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,
> + },

Nit: I would keep the existing formats and code in position [0] so
that if additional modes are added the defaults can be kept in [0]. Also
I usually see drivers listing larger modes first, but that might not
be a strict rule.

> },
> };
>
> @@ -382,7 +582,8 @@ static int imx334_update_controls(struct imx334 *imx334,
> if (ret)
> return ret;
>
> - ret = __v4l2_ctrl_s_ctrl(imx334->hblank_ctrl, mode->hblank);
> + ret = __v4l2_ctrl_modify_range(imx334->hblank_ctrl, IMX334_REG_MIN,
> + IMX334_REG_MAX, 1, mode->hblank);

I might have missed why is this change related

> if (ret)
> return ret;
>
> @@ -506,10 +707,10 @@ 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(codes))
> return -EINVAL;
>
> - code->code = supported_mode.code;
> + code->code = codes[code->index];
>
> return 0;
> }
> @@ -526,15 +727,20 @@ 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)
> + int i;
> +
> + if (fsize->index >= ARRAY_SIZE(supported_modes))
> return -EINVAL;
>
> - if (fsize->code != supported_mode.code)
> + for (i = 0; i < ARRAY_SIZE(codes); i++) {

Can we use for (unsigned int i = 0; ... ) now that C99 has been
adopted ?

> + if (codes[i] == fsize->code)
> + break;
> return -EINVAL;

Are you sure this is right ?
If the format code in fsize->code is == codes[1] you will return
-EINVAL ?

Does the sensor support more formats than MEDIA_BUS_FMT_SRGGB10_1X10
and MEDIA_BUS_FMT_SRGGB12_1X12 ? Because otherwise you could replace
the for loop with a simple check.

However support for flip might change the bayer pattern, so it's
better to keep the loop maybe.

What about centrlize it like you're doing in imx219_get_format_code()
and use it here ? You can place the helper just after the supported
mbus codes declaration maybe ?

> + }
>
> - 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 +797,18 @@ static int imx334_get_pad_format(struct v4l2_subdev *sd,
> return 0;
> }
>
> +static int imx219_get_format_code(struct imx334 *imx334, struct v4l2_subdev_format *fmt)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(codes); i++) {

Ditto, unsigned int and possibily declared inside the for loop

> + if (codes[i] == fmt->format.code)
> + return codes[i];
> + }
> +
> + return -EINVAL;
> +}
> +
> /**
> * imx334_set_pad_format() - Set subdevice pad format
> * @sd: pointer to imx334 V4L2 sub-device structure
> @@ -606,10 +824,21 @@ static int imx334_set_pad_format(struct v4l2_subdev *sd,
> struct imx334 *imx334 = to_imx334(sd);
> const struct imx334_mode *mode;
> int ret = 0;
> + u32 code;
>
> mutex_lock(&imx334->mutex);
>
> - mode = &supported_mode;
> + code = imx219_get_format_code(imx334, fmt);
> + if (code < 0)
> + return -EINVAL;
> +
> + imx334->cur_code = code;
> +
> + 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 +846,7 @@ 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) {

Is this change related ? I think it's good as it avoids an unecessary
update of the controls, but maybe it's not related to this patch ?

Thanks
j

> ret = imx334_update_controls(imx334, mode);
> if (!ret)
> imx334->cur_mode = mode;
> @@ -642,11 +871,26 @@ 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[1], &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 +911,13 @@ 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 +1288,8 @@ static int imx334_probe(struct i2c_client *client)
> }
>
> /* Set default mode to max resolution */
> - imx334->cur_mode = &supported_mode;
> + imx334->cur_mode = &supported_modes[1];
> + imx334->cur_code = codes[1];
> imx334->vblank = imx334->cur_mode->vblank;
>
> ret = imx334_init_controls(imx334);
> --
> 2.17.1
>

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