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Message-ID: <20200420210135.bmca5qw5ilaavuo6@ArchWay.local>
Date: Mon, 20 Apr 2020 21:01:44 +0000
From: Nícolas F. R. A. Prado
<nfraprado@...tonmail.com>
To: Helen Koike <helen.koike@...labora.com>
Cc: Shuah Khan <skhan@...uxfoundation.org>,
linux-media@...r.kernel.org,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Hans Verkuil <hverkuil@...all.nl>,
linux-kernel@...r.kernel.org, lkcamp@...ts.libreplanetbr.org
Subject: Re: [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@...saru.org>
> >> Signed-off-by: Vitor Massaru Iha <vitor@...saru.org>
> >> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...tonmail.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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