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SubjectRe: [PATCH v3 05/10] media: i2c: imx290: Add configurable link frequency and pixel rate
Hi Andrey,

On Sun, May 24, 2020 at 10:25:00PM +0300, Andrey Konovalov wrote:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
>
> 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>
> Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>
> ---
> drivers/media/i2c/imx290.c | 100 ++++++++++++++++++++++++-------------
> 1 file changed, 66 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> index a361c9ac8bd5..e800557cf423 100644
> --- a/drivers/media/i2c/imx290.c
> +++ b/drivers/media/i2c/imx290.c
> @@ -38,8 +38,6 @@
> #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",
> @@ -56,8 +54,6 @@ 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;
> @@ -248,8 +244,13 @@ static const struct imx290_regval imx290_10bit_settings[] = {
> };
>
> /* supported link frequencies */
> -static const s64 imx290_link_freq[] = {
> - IMX290_DEFAULT_LINK_FREQ,
> +static const s64 imx290_link_freq_2lanes[] = {
> + 891000000, /* 1920x1080 - 2 lane */
> + 594000000, /* 1280x720 - 2 lane */
> +};
> +static const s64 imx290_link_freq_4lanes[] = {
> + 445500000, /* 1920x1080 - 4 lane */
> + 297000000, /* 1280x720 - 4 lane */
> };
>
> /* Mode configs */
> @@ -259,16 +260,12 @@ 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,
> },
> };
>
> @@ -442,6 +439,32 @@ static int imx290_get_fmt(struct v4l2_subdev *sd,
> return 0;
> }
>
> +static u8 imx290_get_link_freq_index(struct imx290 *imx290)
> +{
> + const struct imx290_mode *cur_mode = imx290->current_mode;
> +
> + return (cur_mode->width == 1920) ? 0 : 1;

Could you use (imx290->current_mode - imx290_modes) / sizeof(*imx290_modes)
or something like that? It'd have fewer chances of breaking if new modes
are added.

> +}
> +
> +static s64 imx290_get_link_freq(struct imx290 *imx290)
> +{
> + u8 index = imx290_get_link_freq_index(imx290);
> +
> + if (imx290->nlanes == 4)
> + return imx290_link_freq_4lanes[index];
> + else
> + return imx290_link_freq_2lanes[index];

Or even better: store the link frequencies to the modes themselves. They
are a property of the modes after all.

> +}
> +
> +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 / 10);
> +}
> +
> static int imx290_set_fmt(struct v4l2_subdev *sd,
> struct v4l2_subdev_pad_config *cfg,
> struct v4l2_subdev_format *fmt)
> @@ -475,10 +498,14 @@ 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;
> +
> + if (imx290->link_freq)
> + __v4l2_ctrl_s_ctrl(imx290->link_freq,
> + imx290_get_link_freq_index(imx290));
> + if (imx290->pixel_rate)
> + __v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate,
> + imx290_calc_pixel_rate(imx290));
> }
>
> *format = fmt->format;
> @@ -502,12 +529,11 @@ 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)
> +static int imx290_write_current_format(struct imx290 *imx290)
> {
> int ret;
>
> - switch (format->code) {
> + switch (imx290->current_format.code) {
> case MEDIA_BUS_FMT_SRGGB10_1X10:
> ret = imx290_set_register_array(imx290, imx290_10bit_settings,
> ARRAY_SIZE(
> @@ -558,8 +584,8 @@ static int imx290_start_streaming(struct imx290 *imx290)
> return ret;
> }
>
> - /* Set current frame format */
> - ret = imx290_write_current_format(imx290, &imx290->current_format);
> + /* Apply the register values related to current frame format */
> + ret = imx290_write_current_format(imx290);
> if (ret < 0) {
> dev_err(imx290->dev, "Could not set frame format\n");
> return ret;
> @@ -821,12 +847,6 @@ static int imx290_probe(struct i2c_client *client)
> goto free_err;
> }
>
> - if (imx290->ep.link_frequencies[0] != IMX290_DEFAULT_LINK_FREQ) {

This check needs to be modified to correspond to the driver's new
capabilities, not removed.

> - 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");
> @@ -879,23 +899,38 @@ static int imx290_probe(struct i2c_client *client)
>
> mutex_init(&imx290->lock);
>
> + /*
> + * Initialize the frame format. In particular, imx290->current_mode
> + * and imx290->bpp are set to defaults: imx290_calc_pixel_rate() call
> + * below relies on these fields.
> + */
> + imx290_entity_init_cfg(&imx290->sd, NULL);
> +
> v4l2_ctrl_handler_init(&imx290->ctrls, 3);
>
> v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
> V4L2_CID_GAIN, 0, 72, 1, 0);
> - imx290->link_freq =
> - v4l2_ctrl_new_int_menu(&imx290->ctrls,
> - &imx290_ctrl_ops,
> - V4L2_CID_LINK_FREQ,
> - ARRAY_SIZE(imx290_link_freq) - 1,
> - 0, imx290_link_freq);
> + if (imx290->nlanes == 4)
> + imx290->link_freq =
> + v4l2_ctrl_new_int_menu(&imx290->ctrls,
> + &imx290_ctrl_ops,
> + V4L2_CID_LINK_FREQ,
> + ARRAY_SIZE(imx290_link_freq_4lanes) - 1,
> + 0, imx290_link_freq_4lanes);
> + else
> + imx290->link_freq =
> + v4l2_ctrl_new_int_menu(&imx290->ctrls,
> + &imx290_ctrl_ops,
> + V4L2_CID_LINK_FREQ,
> + ARRAY_SIZE(imx290_link_freq_2lanes) - 1,
> + 0, imx290_link_freq_2lanes);
> 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));
>
> imx290->sd.ctrl_handler = &imx290->ctrls;
>
> @@ -919,9 +954,6 @@ static int imx290_probe(struct i2c_client *client)
> goto free_ctrl;
> }
>
> - /* Initialize the frame format (this also sets imx290->current_mode) */
> - imx290_entity_init_cfg(&imx290->sd, NULL);
> -
> ret = v4l2_async_register_subdev(&imx290->sd);
> if (ret < 0) {
> dev_err(dev, "Could not register v4l2 device\n");

--
Regards,

Sakari Ailus

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