Re: [PATCH v2 3/9] media: imx: Use dedicated format handler for i.MX7/8

Jacopo Mondi
2022-02-14T19:05:04Z

Hello

On Fri, Feb 11, 2022 at 03:27:46PM +0100, Alexander Stein wrote:
> From: Dorota Czaplejewicz <dorota.czaplejewicz@puri.sm>
>
> This splits out a format handler which takes into account
> the capabilities of the i.MX7/8 video device,
> as opposed to the default handler compatible with both i.MX5/6 and i.MX7/8.
>
> Signed-off-by: Dorota Czaplejewicz <dorota.czaplejewicz@puri.sm>
> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> ---
> Changes in v2:
> * Switch back to using enum
> * Get rid of an additional call to v4l2_fill_pixfmt()
>
> drivers/staging/media/imx/imx-media-utils.c | 60 +++++++++++++++++++--
> 1 file changed, 56 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
> index c42f3da8e3a8..02a4cb124d37 100644
> --- a/drivers/staging/media/imx/imx-media-utils.c
> +++ b/drivers/staging/media/imx/imx-media-utils.c
> @@ -516,10 +516,9 @@ void imx_media_try_colorimetry(struct v4l2_mbus_framefmt *tryfmt,
> }
> EXPORT_SYMBOL_GPL(imx_media_try_colorimetry);
>
> -int imx_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
> - const struct v4l2_mbus_framefmt *mbus,
> - const struct imx_media_pixfmt *cc,
> - enum imx_media_device_type type)
> +static int imx56_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
> + const struct v4l2_mbus_framefmt *mbus,
> + const struct imx_media_pixfmt *cc)
> {
> u32 width;
> u32 stride;
> @@ -568,6 +567,59 @@ int imx_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
>
> return 0;
> }
> +
> +static int imx78_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
> + const struct v4l2_mbus_framefmt *mbus,
> + const struct imx_media_pixfmt *cc)
> +{
> + u32 aligned_width;
> + int ret;
> +
> + if (!cc)
> + cc = imx_media_find_mbus_format(mbus->code, PIXFMT_SEL_ANY);
> +
> + if (!cc)
> + return -EINVAL;
> + /*
> + * The hardware can handle line lengths divisible by 4 pixels
> + * as long as the whole buffer size ends up divisible by 8 bytes.
> + * If not, use the value of 8 pixels recommended in the datasheet.
> + * Only 8bits-per-pixel formats may need to get aligned to 8 pixels,
> + * because both 10-bit and 16-bit pixels occupy 2 bytes.
> + * In those, 4-pixel aligmnent is equal to 8-byte alignment.
> + */
> + if (cc->bpp == 1)

Am I mistaken or in the format enumeration bpp is expressed in bits
and not bytes ?

Thanks
j

> + aligned_width = round_up(mbus->width, 8);
> + else
> + aligned_width = round_up(mbus->width, 4);
> +
> + ret = v4l2_fill_pixfmt(pix, cc->fourcc,
> + aligned_width, mbus->height);
> + if (ret)
> + return ret;
> +
> + pix->colorspace = mbus->colorspace;
> + pix->xfer_func = mbus->xfer_func;
> + pix->ycbcr_enc = mbus->ycbcr_enc;
> + pix->quantization = mbus->quantization;
> + pix->field = mbus->field;
> +
> + return ret;
> +}
> +
> +int imx_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
> + const struct v4l2_mbus_framefmt *mbus,
> + const struct imx_media_pixfmt *cc,
> + enum imx_media_device_type type)
> +{
> + switch (type) {
> + case DEVICE_TYPE_IMX56:
> + return imx56_media_mbus_fmt_to_pix_fmt(pix, mbus, cc);
> + case DEVICE_TYPE_IMX78:
> + return imx78_media_mbus_fmt_to_pix_fmt(pix, mbus, cc);
> + }
> + return -EINVAL;
> +}
> EXPORT_SYMBOL_GPL(imx_media_mbus_fmt_to_pix_fmt);
>
> void imx_media_free_dma_buf(struct device *dev,
> --
> 2.25.1
>