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SubjectRe: [PATCH v2 3/3] media: vimc: deb: Add support for {RGB,BGR,GBR}888 bus formats on source pad
Hi Helen,

thanks for the review.

Some comments below.

On Mon, Mar 30, 2020 at 04:43:53PM -0300, Helen Koike wrote:
>
> Hello,
>
> On 3/26/20 7:06 PM, Shuah Khan wrote:
> > On 3/26/20 3:47 PM, Nícolas F. R. A. Prado wrote:
> >> Add support for RGB888_*, BGR888_* and GBR888_* media bus formats on
> >> the source pad of debayer subdevices.
> >>
> >> Co-developed-by: Vitor Massaru Iha <vitor@massaru.org>
> >> Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
> >> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@protonmail.com>
> >> ---
> >>
> >> Changes in v2:
> >> - Change commit message to reflect v2 changes
> >> - Rename variables
> >> - Fix array formatting
> >> - Add vimc_deb_is_src_code_valid function
> >> - Add other BGR888 and RGB888 formats to debayer source pad supported
> >>    formats
> >>
> >>   drivers/media/platform/vimc/vimc-debayer.c | 61 +++++++++++++++++-----
> >>   1 file changed, 49 insertions(+), 12 deletions(-)
> >>
> >> diff --git a/drivers/media/platform/vimc/vimc-debayer.c b/drivers/media/platform/vimc/vimc-debayer.c
> >> index baf6bf9f65b5..33a9bea770bc 100644
> >> --- a/drivers/media/platform/vimc/vimc-debayer.c
> >> +++ b/drivers/media/platform/vimc/vimc-debayer.c
> >> @@ -51,6 +51,19 @@ static const struct v4l2_mbus_framefmt sink_fmt_default = {
> >>       .colorspace = V4L2_COLORSPACE_DEFAULT,
> >>   };
> >>   +static const u32 vimc_deb_src_mbus_codes[] = {
> >> +    MEDIA_BUS_FMT_GBR888_1X24,
> >> +    MEDIA_BUS_FMT_BGR888_1X24,
> >> +    MEDIA_BUS_FMT_BGR888_3X8,
> >> +    MEDIA_BUS_FMT_RGB888_1X24,
> >> +    MEDIA_BUS_FMT_RGB888_2X12_BE,
> >> +    MEDIA_BUS_FMT_RGB888_2X12_LE,
> >> +    MEDIA_BUS_FMT_RGB888_3X8,
> >> +    MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,
> >> +    MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA,
> >> +    MEDIA_BUS_FMT_RGB888_1X32_PADHI,
> >> +};
> >> +
> >>   static const struct vimc_deb_pix_map vimc_deb_pix_map_list[] = {
> >>       {
> >>           .code = MEDIA_BUS_FMT_SBGGR8_1X8,
> >> @@ -125,6 +138,17 @@ static const struct vimc_deb_pix_map *vimc_deb_pix_map_by_code(u32 code)
> >>       return NULL;
> >>   }
> >>   +static int vimc_deb_is_src_code_invalid(u32 code)
> >> +{
> >> +    unsigned int i;
> >> +
> >> +    for (i = 0; i < ARRAY_SIZE(vimc_deb_src_mbus_codes); i++)
> >> +        if (vimc_deb_src_mbus_codes[i] == code)
> >> +            return 0;
> >> +
> >> +    return -EINVAL;
> >> +}
>
> The naming is a bit confusing, since it checks if it is invalid, but returns a negative number if so.
>
> How about renaming to vimc_deb_src_code_is_valid ?

I also don't like that the function is called 'is_invalid', but I gave it that
name because I think it actually is less confusing when calling.
For example, later in this patch I do:

    } else if (vimc_deb_is_src_code_invalid(fse->code)) {
return -EINVAL;

Which to me becomes very clear.

Since the error values evaluate to True, the other alternative that I
see is to call it 'is_valid', but return 0 when invalid and 1 when valid.
But then we no longer return the -EINVAL value, which I think makes the function
less clear.

What do you think?

Thank you,
Nícolas

>
> >> +
> >>   static int vimc_deb_init_cfg(struct v4l2_subdev *sd,
> >>                    struct v4l2_subdev_pad_config *cfg)
> >>   {
> >> @@ -148,14 +172,11 @@ static int vimc_deb_enum_mbus_code(struct v4l2_subdev *sd,
> >>                      struct v4l2_subdev_pad_config *cfg,
> >>                      struct v4l2_subdev_mbus_code_enum *code)
> >>   {
> >> -    /* We only support one format for source pads */
> >>       if (VIMC_IS_SRC(code->pad)) {
> >> -        struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);
> >> -
> >> -        if (code->index)
> >> +        if (code->index >= ARRAY_SIZE(vimc_deb_src_mbus_codes))
> >>               return -EINVAL;
> >>   -        code->code = vdeb->src_code;
> >> +        code->code = vimc_deb_src_mbus_codes[code->index];
> >>       } else {
> >>           if (code->index >= ARRAY_SIZE(vimc_deb_pix_map_list))
> >>               return -EINVAL;
> >> @@ -170,8 +191,6 @@ static int vimc_deb_enum_frame_size(struct v4l2_subdev *sd,
> >>                       struct v4l2_subdev_pad_config *cfg,
> >>                       struct v4l2_subdev_frame_size_enum *fse)
> >>   {
> >> -    struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);
> >> -
> >>       if (fse->index)
> >>           return -EINVAL;
> >>   @@ -181,7 +200,7 @@ static int vimc_deb_enum_frame_size(struct v4l2_subdev *sd,
> >>             if (!vpix)
> >>               return -EINVAL;
> >> -    } else if (fse->code != vdeb->src_code) {
> >> +    } else if (vimc_deb_is_src_code_invalid(fse->code)) {
> >>           return -EINVAL;
> >>       }
> >>   @@ -237,6 +256,7 @@ static int vimc_deb_set_fmt(struct v4l2_subdev *sd,
> >>   {
> >>       struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);
> >>       struct v4l2_mbus_framefmt *sink_fmt;
> >> +    u32 *src_code;
> >>         if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> >>           /* Do not change the format while stream is on */
> >> @@ -244,8 +264,10 @@ static int vimc_deb_set_fmt(struct v4l2_subdev *sd,
> >>               return -EBUSY;
> >>             sink_fmt = &vdeb->sink_fmt;
> >> +        src_code = &vdeb->src_code;
> >>       } else {
> >>           sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> >> +        src_code = &v4l2_subdev_get_try_format(sd, cfg, 1)->code;
> >>       }
> >>         /*
> >> @@ -253,9 +275,14 @@ static int vimc_deb_set_fmt(struct v4l2_subdev *sd,
> >>        * it is propagated from the sink
> >>        */
> >>       if (VIMC_IS_SRC(fmt->pad)) {
> >> +        u32 code = fmt->format.code;
> >> +
> >>           fmt->format = *sink_fmt;
> >> -        /* TODO: Add support for other formats */
> >> -        fmt->format.code = vdeb->src_code;
> >> +
> >> +        if (!vimc_deb_is_src_code_invalid(code))
> >> +            *src_code = code;
> >> +
> >> +        fmt->format.code = *src_code;
> >>       } else {
> >>           /* Set the new format in the sink pad */
> >>           vimc_deb_adjust_sink_fmt(&fmt->format);
> >> @@ -291,11 +318,21 @@ static void vimc_deb_set_rgb_mbus_fmt_rgb888_1x24(struct vimc_deb_device *vdeb,
> >>                             unsigned int col,
> >>                             unsigned int rgb[3])
> >
> > Change this to pass a pointer and size.
>
> Hi Shuah,
>
> Modifying vimc_deb_set_rgb_mbus_fmt_rgb888_1x24() is not part of this patch, or do you mean another part of the code?
>
> Thanks for reviewing
> Helen
>
> >
> >>   {
> >> +    const struct vimc_pix_map *vpix;
> >>       unsigned int i, index;
> >>   +    vpix = vimc_pix_map_by_code(vdeb->src_code);
> >>       index = VIMC_FRAME_INDEX(lin, col, vdeb->sink_fmt.width, 3);
> >> -    for (i = 0; i < 3; i++)
> >> -        vdeb->src_frame[index + i] = rgb[i];
> >> +    for (i = 0; i < 3; i++) {
> >> +        switch (vpix->pixelformat) {
> >> +        case V4L2_PIX_FMT_RGB24:
> >> +            vdeb->src_frame[index + i] = rgb[i];
> >> +            break;
> >> +        case V4L2_PIX_FMT_BGR24:
> >> +            vdeb->src_frame[index + i] = rgb[2-i];
> >> +            break;
> >> +        }
> >> +    }
> >>   }
> >>     static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)
> >>
> >
> > thanks,
> > -- Shuah

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