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SubjectRe: [PATCH v2 5/6] media: i2c: imx290: Add configurable link frequency and pixel rate
Hi Manivannan,

On Thu, Dec 19, 2019 at 11:52:21PM +0530, Manivannan Sadhasivam wrote:
> IMX290 operates with multiple link frequency and pixel rate combinations.
> The initial driver used a single setting for both but since we now have
> the lane count support in place, let's add configurable link frequency
> and pixel rate.
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
> drivers/media/i2c/imx290.c | 155 +++++++++++++++++++++----------------
> 1 file changed, 89 insertions(+), 66 deletions(-)
>
> diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> index a1974340e6fa..52f1e470b507 100644
> --- a/drivers/media/i2c/imx290.c
> +++ b/drivers/media/i2c/imx290.c
> @@ -45,8 +45,6 @@
> #define IMX290_HMAX_2_720 0x19C8
> #define IMX290_HMAX_4_720 0x0CE4
>
> -#define IMX290_DEFAULT_LINK_FREQ 445500000
> -
> static const char * const imx290_supply_name[] = {
> "vdda",
> "vddd",
> @@ -63,8 +61,6 @@ struct imx290_regval {
> struct imx290_mode {
> u32 width;
> u32 height;
> - u32 pixel_rate;
> - u32 link_freq_index;
>
> const struct imx290_regval *data;
> u32 data_size;
> @@ -281,7 +277,10 @@ static const struct imx290_regval imx290_12bit_settings[] = {
>
> /* supported link frequencies */
> static const s64 imx290_link_freq[] = {
> - IMX290_DEFAULT_LINK_FREQ,
> + 891000000, /* 1920x1080 - 2 lane */
> + 445500000, /* 1920x1080 - 4 lane */
> + 594000000, /* 1280x720 - 2 lane */
> + 297000000, /* 1280x720 - 4 lane */

Please use different arrays for different lane configurations. That makes
this a lot cleaner.

This patch should precede the one adding support for 12 bpp.

> };
>
> /* Mode configs */
> @@ -291,16 +290,12 @@ static const struct imx290_mode imx290_modes[] = {
> .height = 1080,
> .data = imx290_1080p_settings,
> .data_size = ARRAY_SIZE(imx290_1080p_settings),
> - .pixel_rate = 178200000,
> - .link_freq_index = 0,
> },
> {
> .width = 1280,
> .height = 720,
> .data = imx290_720p_settings,
> .data_size = ARRAY_SIZE(imx290_720p_settings),
> - .pixel_rate = 178200000,
> - .link_freq_index = 0,
> },
> };
>
> @@ -509,6 +504,73 @@ static int imx290_get_fmt(struct v4l2_subdev *sd,
> return 0;
> }
>
> +static s64 imx290_get_link_freq_index(struct imx290 *imx290)
> +{
> + const struct imx290_mode *cur_mode = imx290->current_mode;
> + u8 index;
> +
> + if (cur_mode->width == 1920)
> + index = imx290->nlanes / 4;
> + else
> + index = (imx290->nlanes / 4) + 2;
> +
> + return index;
> +}
> +
> +static s64 imx290_get_link_freq(struct imx290 *imx290)
> +{
> + u8 index = imx290_get_link_freq_index(imx290);
> +
> + return imx290_link_freq[index];
> +}
> +
> +static u64 imx290_calc_pixel_rate(struct imx290 *imx290)
> +{
> + s64 link_freq = imx290_get_link_freq(imx290);
> + u8 nlanes = imx290->nlanes;
> +
> + /* pixel rate = link_freq * 2 * nr_of_lanes / bits_per_sample */
> + return (link_freq * 2 * nlanes / imx290->bpp);
> +}
> +
> +static int imx290_write_current_format(struct imx290 *imx290,
> + struct v4l2_mbus_framefmt *format)
> +{
> + int ret;
> +
> + switch (format->code) {
> + case MEDIA_BUS_FMT_SRGGB10_1X10:
> + ret = imx290_set_register_array(imx290, imx290_10bit_settings,
> + ARRAY_SIZE(
> + imx290_10bit_settings));
> + if (ret < 0) {
> + dev_err(imx290->dev, "Could not set format registers\n");
> + return ret;
> + }
> +
> + imx290->bpp = 10;
> +
> + break;
> + case MEDIA_BUS_FMT_SRGGB12_1X12:
> + ret = imx290_set_register_array(imx290, imx290_12bit_settings,
> + ARRAY_SIZE(
> + imx290_12bit_settings));
> + if (ret < 0) {
> + dev_err(imx290->dev, "Could not set format registers\n");
> + return ret;
> + }
> +
> + imx290->bpp = 12;
> +
> + break;
> + default:
> + dev_err(imx290->dev, "Unknown pixel format\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> static int imx290_set_fmt(struct v4l2_subdev *sd,
> struct v4l2_subdev_pad_config *cfg,
> struct v4l2_subdev_format *fmt)
> @@ -517,6 +579,7 @@ static int imx290_set_fmt(struct v4l2_subdev *sd,
> const struct imx290_mode *mode;
> struct v4l2_mbus_framefmt *format;
> unsigned int i;
> + int ret = 0;
>
> mutex_lock(&imx290->lock);
>
> @@ -542,17 +605,27 @@ static int imx290_set_fmt(struct v4l2_subdev *sd,
> format = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
> } else {
> format = &imx290->current_format;
> - __v4l2_ctrl_s_ctrl(imx290->link_freq, mode->link_freq_index);
> - __v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate, mode->pixel_rate);
> -
> imx290->current_mode = mode;
> +
> + /* Set current frame format */
> + ret = imx290_write_current_format(imx290, &fmt->format);
> + if (ret < 0) {
> + dev_err(imx290->dev, "Could not set frame format\n");
> + goto err_out;
> + }
> +
> + __v4l2_ctrl_s_ctrl(imx290->link_freq,
> + imx290_get_link_freq_index(imx290));
> + __v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate,
> + imx290_calc_pixel_rate(imx290));
> }
>
> *format = fmt->format;
>
> +err_out:
> mutex_unlock(&imx290->lock);
>
> - return 0;
> + return ret;
> }
>
> static int imx290_entity_init_cfg(struct v4l2_subdev *subdev,
> @@ -569,44 +642,6 @@ static int imx290_entity_init_cfg(struct v4l2_subdev *subdev,
> return 0;
> }
>
> -static int imx290_write_current_format(struct imx290 *imx290,
> - struct v4l2_mbus_framefmt *format)
> -{
> - int ret;
> -
> - switch (format->code) {
> - case MEDIA_BUS_FMT_SRGGB10_1X10:
> - ret = imx290_set_register_array(imx290, imx290_10bit_settings,
> - ARRAY_SIZE(
> - imx290_10bit_settings));
> - if (ret < 0) {
> - dev_err(imx290->dev, "Could not set format registers\n");
> - return ret;
> - }
> -
> - imx290->bpp = 10;
> -
> - break;
> - case MEDIA_BUS_FMT_SRGGB12_1X12:
> - ret = imx290_set_register_array(imx290, imx290_12bit_settings,
> - ARRAY_SIZE(
> - imx290_12bit_settings));
> - if (ret < 0) {
> - dev_err(imx290->dev, "Could not set format registers\n");
> - return ret;
> - }
> -
> - imx290->bpp = 12;
> -
> - break;
> - default:
> - dev_err(imx290->dev, "Unknown pixel format\n");
> - return -EINVAL;
> - }
> -
> - return 0;
> -}
> -
> static int imx290_set_hmax(struct imx290 *imx290, u32 val)
> {
> int ret;
> @@ -640,13 +675,6 @@ static int imx290_start_streaming(struct imx290 *imx290)
> return ret;
> }
>
> - /* Set current frame format */
> - ret = imx290_write_current_format(imx290, &imx290->current_format);
> - if (ret < 0) {
> - dev_err(imx290->dev, "Could not set frame format\n");
> - return ret;
> - }
> -
> /* Apply default values of current mode */
> ret = imx290_set_register_array(imx290, imx290->current_mode->data,
> imx290->current_mode->data_size);
> @@ -904,12 +932,6 @@ static int imx290_probe(struct i2c_client *client)
> goto free_err;
> }
>
> - if (imx290->ep.link_frequencies[0] != IMX290_DEFAULT_LINK_FREQ) {
> - dev_err(dev, "Unsupported link frequency\n");
> - ret = -EINVAL;
> - goto free_err;
> - }
> -
> /* Only CSI2 is supported for now */
> if (imx290->ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
> dev_err(dev, "Unsupported bus type, should be CSI2\n");
> @@ -976,14 +998,15 @@ static int imx290_probe(struct i2c_client *client)
> &imx290_ctrl_ops,
> V4L2_CID_LINK_FREQ,
> ARRAY_SIZE(imx290_link_freq) - 1,
> - 0, imx290_link_freq);
> + (imx290->nlanes / 4),
> + imx290_link_freq);
> if (imx290->link_freq)
> imx290->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
>
> imx290->pixel_rate = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
> V4L2_CID_PIXEL_RATE, 1,
> INT_MAX, 1,
> - imx290_modes[0].pixel_rate);
> + imx290_calc_pixel_rate(imx290));
>
> v4l2_ctrl_new_std_menu_items(&imx290->ctrls, &imx290_ctrl_ops,
> V4L2_CID_TEST_PATTERN,

--
Regards,

Sakari Ailus

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