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SubjectRe: [PATCH v2 1/3] media: vimc: Support multiple media bus codes for each pixelformat
Hi Helen,

thanks for the review.

Some comments below.

On Mon, Mar 30, 2020 at 04:36:45PM -0300, Helen Koike wrote:
>
> Hi Nícolas,
>
> thank you for the patch.
>
> The series looks good in general, just minor comments below.
>
> On 3/26/20 6:47 PM, Nícolas F. R. A. Prado wrote:
> > Change vimc_pix_map_list to allow multiple media bus codes to map to the
> > same pixelformat, making it possible to add media bus codes for which
> > there are no pixelformat.
> >
> > Signed-off-by: Nícolas F. R. A. Prado <nfraprado@protonmail.com>
> > ---
> >
> > Changes in v2:
> > - Fix vimc_mbus_code_by_index not checking code array bounds
> > - Fix array formatting
> > - Rename variables
> > - Change code array size
> > - Add comment about vimc_mbus_code_by_index return value
> >
> > drivers/media/platform/vimc/vimc-common.c | 70 ++++++++++++++---------
> > drivers/media/platform/vimc/vimc-common.h | 11 +++-
> > drivers/media/platform/vimc/vimc-scaler.c | 10 +++-
> > drivers/media/platform/vimc/vimc-sensor.c | 6 +-
> > 4 files changed, 65 insertions(+), 32 deletions(-)
> >
> > diff --git a/drivers/media/platform/vimc/vimc-common.c b/drivers/media/platform/vimc/vimc-common.c
> > index c95c17c048f2..119846f3eaa5 100644
> > --- a/drivers/media/platform/vimc/vimc-common.c
> > +++ b/drivers/media/platform/vimc/vimc-common.c
> > @@ -19,19 +19,19 @@ static const struct vimc_pix_map vimc_pix_map_list[] = {
> >
> > /* RGB formats */
> > {
> > - .code = MEDIA_BUS_FMT_BGR888_1X24,
> > + .code = { MEDIA_BUS_FMT_BGR888_1X24 },
> > .pixelformat = V4L2_PIX_FMT_BGR24,
> > .bpp = 3,
> > .bayer = false,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_RGB888_1X24,
> > + .code = { MEDIA_BUS_FMT_RGB888_1X24 },
> > .pixelformat = V4L2_PIX_FMT_RGB24,
> > .bpp = 3,
> > .bayer = false,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_ARGB8888_1X32,
> > + .code = { MEDIA_BUS_FMT_ARGB8888_1X32 },
> > .pixelformat = V4L2_PIX_FMT_ARGB32,
> > .bpp = 4,
> > .bayer = false,
> > @@ -39,49 +39,49 @@ static const struct vimc_pix_map vimc_pix_map_list[] = {
> >
> > /* Bayer formats */
> > {
> > - .code = MEDIA_BUS_FMT_SBGGR8_1X8,
> > + .code = { MEDIA_BUS_FMT_SBGGR8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SBGGR8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGBRG8_1X8,
> > + .code = { MEDIA_BUS_FMT_SGBRG8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SGBRG8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGRBG8_1X8,
> > + .code = { MEDIA_BUS_FMT_SGRBG8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SGRBG8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SRGGB8_1X8,
> > + .code = { MEDIA_BUS_FMT_SRGGB8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SRGGB8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SBGGR10_1X10,
> > + .code = { MEDIA_BUS_FMT_SBGGR10_1X10 },
> > .pixelformat = V4L2_PIX_FMT_SBGGR10,
> > .bpp = 2,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGBRG10_1X10,
> > + .code = { MEDIA_BUS_FMT_SGBRG10_1X10 },
> > .pixelformat = V4L2_PIX_FMT_SGBRG10,
> > .bpp = 2,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGRBG10_1X10,
> > + .code = { MEDIA_BUS_FMT_SGRBG10_1X10 },
> > .pixelformat = V4L2_PIX_FMT_SGRBG10,
> > .bpp = 2,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SRGGB10_1X10,
> > + .code = { MEDIA_BUS_FMT_SRGGB10_1X10 },
> > .pixelformat = V4L2_PIX_FMT_SRGGB10,
> > .bpp = 2,
> > .bayer = true,
> > @@ -89,25 +89,25 @@ static const struct vimc_pix_map vimc_pix_map_list[] = {
> >
> > /* 10bit raw bayer a-law compressed to 8 bits */
> > {
> > - .code = MEDIA_BUS_FMT_SBGGR10_ALAW8_1X8,
> > + .code = { MEDIA_BUS_FMT_SBGGR10_ALAW8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SBGGR10ALAW8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGBRG10_ALAW8_1X8,
> > + .code = { MEDIA_BUS_FMT_SGBRG10_ALAW8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SGBRG10ALAW8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGRBG10_ALAW8_1X8,
> > + .code = { MEDIA_BUS_FMT_SGRBG10_ALAW8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SGRBG10ALAW8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SRGGB10_ALAW8_1X8,
> > + .code = { MEDIA_BUS_FMT_SRGGB10_ALAW8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SRGGB10ALAW8,
> > .bpp = 1,
> > .bayer = true,
> > @@ -115,49 +115,49 @@ static const struct vimc_pix_map vimc_pix_map_list[] = {
> >
> > /* 10bit raw bayer DPCM compressed to 8 bits */
> > {
> > - .code = MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
> > + .code = { MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SBGGR10DPCM8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
> > + .code = { MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SGBRG10DPCM8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
> > + .code = { MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SGRBG10DPCM8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
> > + .code = { MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8 },
> > .pixelformat = V4L2_PIX_FMT_SRGGB10DPCM8,
> > .bpp = 1,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SBGGR12_1X12,
> > + .code = { MEDIA_BUS_FMT_SBGGR12_1X12 },
> > .pixelformat = V4L2_PIX_FMT_SBGGR12,
> > .bpp = 2,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGBRG12_1X12,
> > + .code = { MEDIA_BUS_FMT_SGBRG12_1X12 },
> > .pixelformat = V4L2_PIX_FMT_SGBRG12,
> > .bpp = 2,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SGRBG12_1X12,
> > + .code = { MEDIA_BUS_FMT_SGRBG12_1X12 },
> > .pixelformat = V4L2_PIX_FMT_SGRBG12,
> > .bpp = 2,
> > .bayer = true,
> > },
> > {
> > - .code = MEDIA_BUS_FMT_SRGGB12_1X12,
> > + .code = { MEDIA_BUS_FMT_SRGGB12_1X12 },
> > .pixelformat = V4L2_PIX_FMT_SRGGB12,
> > .bpp = 2,
> > .bayer = true,
> > @@ -182,13 +182,31 @@ const struct vimc_pix_map *vimc_pix_map_by_index(unsigned int i)
> > return &vimc_pix_map_list[i];
> > }
> >
> > +const u32 vimc_mbus_code_by_index(unsigned int index)
> > +{
> > + unsigned int i, j;
> > +
> > + for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
> > + for (j = 0; j < ARRAY_SIZE(vimc_pix_map_list[i].code); j++) {
> > + if (vimc_pix_map_list[i].code[j]) {
>
> Can this be false?

Actually it can, but after you asked I realized this code could be way clearer.

When vimc_pix_map_list[i].code[j] is 0, it means that this is an unused value of
the array, so we should skip to the next pixelformat.
I think writing it this way instead would be better, what do you think?

for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
for (j = 0; j < ARRAY_SIZE(vimc_pix_map_list[i].code); j++) {
if (!vimc_pix_map_list[i].code[j])
break;

if (!index)
return vimc_pix_map_list[i].code[j];
index--;

>
> > + if (!index)
> > + return vimc_pix_map_list[i].code[j];
> > + index--;
> > + }
> > + }
> > + }
> > + return 0;
> > +}
> > +
> > const struct vimc_pix_map *vimc_pix_map_by_code(u32 code)
> > {
> > - unsigned int i;
> > + unsigned int i, j;
> >
> > for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
> > - if (vimc_pix_map_list[i].code == code)
> > - return &vimc_pix_map_list[i];
> > + for (j = 0; j < ARRAY_SIZE(vimc_pix_map_list[i].code); j++) {
> > + if (vimc_pix_map_list[i].code[j] == code)
> > + return &vimc_pix_map_list[i];
> > + }
> > }
> > return NULL;
> > }
> > diff --git a/drivers/media/platform/vimc/vimc-common.h b/drivers/media/platform/vimc/vimc-common.h
> > index 616d5a6b0754..585441694c86 100644
> > --- a/drivers/media/platform/vimc/vimc-common.h
> > +++ b/drivers/media/platform/vimc/vimc-common.h
> > @@ -69,7 +69,7 @@ do { \
> > * V4L2_PIX_FMT_* fourcc pixelformat and its bytes per pixel (bpp)
> > */
> > struct vimc_pix_map {
> > - unsigned int code;
> > + unsigned int code[1];
> > unsigned int bpp;
> > u32 pixelformat;
> > bool bayer;
> > @@ -172,6 +172,15 @@ void vimc_sen_release(struct vimc_ent_device *ved);
> > */
> > const struct vimc_pix_map *vimc_pix_map_by_index(unsigned int i);
> >
> > +/**
> > + * vimc_mbus_code_by_index - get mbus code by its index
> > + *
> > + * @index: index of the mbus code in vimc_pix_map_list
> > + *
> > + * Returns 0 if no mbus code is found for the given index.
> > + */
> > +const u32 vimc_mbus_code_by_index(unsigned int index);
> > +
> > /**
> > * vimc_pix_map_by_code - get vimc_pix_map struct by media bus code
> > *
> > diff --git a/drivers/media/platform/vimc/vimc-scaler.c b/drivers/media/platform/vimc/vimc-scaler.c
> > index 7521439747c5..6bac1fa65a6f 100644
> > --- a/drivers/media/platform/vimc/vimc-scaler.c
> > +++ b/drivers/media/platform/vimc/vimc-scaler.c
> > @@ -110,13 +110,19 @@ static int vimc_sca_enum_mbus_code(struct v4l2_subdev *sd,
> > struct v4l2_subdev_pad_config *cfg,
> > struct v4l2_subdev_mbus_code_enum *code)
> > {
> > - const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
> > + const u32 mbus_code = vimc_mbus_code_by_index(code->index);
> > + const struct vimc_pix_map *vpix;
> > +
> > + if (!mbus_code)
> > + return -EINVAL;
> > +
> > + vpix = vimc_pix_map_by_code(mbus_code);
> >
> > /* We don't support bayer format */
> > if (!vpix || vpix->bayer)
> > return -EINVAL;
> >
> > - code->code = vpix->code;
> > + code->code = mbus_code;
>
> no need to change this.

This change is actually needed, because after this patch, the code property of
vimc_pix_map_list is an array, so there isn't a 1 to 1 relation between mbus
code and pixmap format anymore.
Since we already got the mbus code by index through
vimc_mbus_code_by_index(code->index), we just use it.

>
> >
> > return 0;
> > }
> > diff --git a/drivers/media/platform/vimc/vimc-sensor.c b/drivers/media/platform/vimc/vimc-sensor.c
> > index 92daee58209e..b8bd430809c1 100644
> > --- a/drivers/media/platform/vimc/vimc-sensor.c
> > +++ b/drivers/media/platform/vimc/vimc-sensor.c
> > @@ -52,12 +52,12 @@ static int vimc_sen_enum_mbus_code(struct v4l2_subdev *sd,
> > struct v4l2_subdev_pad_config *cfg,
> > struct v4l2_subdev_mbus_code_enum *code)
> > {
> > - const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
> > + const u32 mbus_code = vimc_mbus_code_by_index(code->index);
> >
> > - if (!vpix)
> > + if (!mbus_code)
> > return -EINVAL;
> >
> > - code->code = vpix->code;
> > + code->code = mbus_code;
> >
> > return 0;
> > }
> >
>
> With these changes
>
> Acked-by: Helen Koike <helen.koike@collabora.com>
>
> Regards,
> Helen

Thank you,
Nícolas

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