Re: [PATCH 6/9] media: vsp1: Add support for missing 16-bit RGB555 formats

[Jacopo Mondi <jacopo@jmondi.org>]

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Hi Laurent,

On Tue, Apr 23, 2019 at 05:46:51PM +0300, Laurent Pinchart wrote:
> Hi Jacopo,
>
> On Tue, Apr 23, 2019 at 03:55:08PM +0200, Jacopo Mondi wrote:
> > On Thu, Mar 28, 2019 at 09:07:20AM +0200, Laurent Pinchart wrote:
> > > Add support for the V4L2_PIX_FMT_RGBA555, V4L2_PIX_FMT_RGBX555,
> > > V4L2_PIX_FMT_ABGR555, V4L2_PIX_FMT_XBGR555, V4L2_PIX_FMT_BGRA555 and
> > > V4L2_PIX_FMT_BGRX555 formats to the VSP driver.
> > >
> > > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> > > ---
> > >  drivers/media/platform/vsp1/vsp1_pipe.c | 32 +++++++++++++++++++++++++
> > >  1 file changed, 32 insertions(+)
> > >
> > > diff --git a/drivers/media/platform/vsp1/vsp1_pipe.c b/drivers/media/platform/vsp1/vsp1_pipe.c
> > > index f6665871aa11..92f71dec99c5 100644
> > > --- a/drivers/media/platform/vsp1/vsp1_pipe.c
> > > +++ b/drivers/media/platform/vsp1/vsp1_pipe.c
> > > @@ -66,14 +66,46 @@ static const struct vsp1_format_info vsp1_video_formats[] = {
> > >  	  VI6_FMT_BGRA_4444, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > >  	  VI6_RPF_DSWAP_P_WDS,
> > >  	  1, { 16, 0, 0 }, false, false, 1, 1, false },
> > > +#define V4L2_PIX_FMT_ARGB555 v4l2_fourcc('A', 'R', '1', '5') /* 16  ARGB-1-5-5-5  */
> >
> > Why is this here? I see the exact same line in videodev2.h.
> > Is this a leftover?
>
> Oops. It is. I'm sorry, I'll remove that.
>
> > >  	{ V4L2_PIX_FMT_ARGB555, MEDIA_BUS_FMT_ARGB8888_1X32,
> > >  	  VI6_FMT_ARGB_1555, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > >  	  VI6_RPF_DSWAP_P_WDS,
> > >  	  1, { 16, 0, 0 }, false, false, 1, 1, true },
> > > +#define V4L2_PIX_FMT_XRGB555 v4l2_fourcc('X', 'R', '1', '5') /* 16  XRGB-1-5-5-5  */
> >
> > same here and below
> >
> > >  	{ V4L2_PIX_FMT_XRGB555, MEDIA_BUS_FMT_ARGB8888_1X32,
> > >  	  VI6_FMT_XRGB_1555, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > >  	  VI6_RPF_DSWAP_P_WDS,
> > >  	  1, { 16, 0, 0 }, false, false, 1, 1, false },
> > > +#define V4L2_PIX_FMT_RGBA555 v4l2_fourcc('R', 'A', '1', '5') /* 16  RGBA-5-5-5-1  */
> > > +	{ V4L2_PIX_FMT_RGBA555, MEDIA_BUS_FMT_ARGB8888_1X32,
> > > +	  VI6_FMT_RGBA_5551, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > > +	  VI6_RPF_DSWAP_P_WDS,
> > > +	  1, { 16, 0, 0 }, false, false, 1, 1, true },
> > > +#define V4L2_PIX_FMT_RGBX555 v4l2_fourcc('R', 'X', '1', '5') /* 16  RGBX-5-5-5-1  */
> > > +	{ V4L2_PIX_FMT_RGBX555, MEDIA_BUS_FMT_ARGB8888_1X32,
> > > +	  VI6_FMT_RGBX_5551, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > > +	  VI6_RPF_DSWAP_P_WDS,
> > > +	  1, { 16, 0, 0 }, false, false, 1, 1, false },
> > > +#define V4L2_PIX_FMT_ABGR555 v4l2_fourcc('A', 'B', '1', '5') /* 16  ABGR-1-5-5-5  */
> > > +	{ V4L2_PIX_FMT_ABGR555, MEDIA_BUS_FMT_ARGB8888_1X32,
> > > +	  VI6_FMT_ABGR_1555, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > > +	  VI6_RPF_DSWAP_P_WDS,
> > > +	  1, { 16, 0, 0 }, false, false, 1, 1, true },
> > > +#define V4L2_PIX_FMT_XBGR555 v4l2_fourcc('X', 'B', '1', '5') /* 16  XBGR-1-5-5-5  */
> > > +	{ V4L2_PIX_FMT_XBGR555, MEDIA_BUS_FMT_ARGB8888_1X32,
> > > +	  VI6_FMT_ABGR_1555, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > > +	  VI6_RPF_DSWAP_P_WDS,
> > > +	  1, { 16, 0, 0 }, false, false, 1, 1, false },
> >
> > Looks good, additional defines apart
> >
> > > +#define V4L2_PIX_FMT_BGRA555 v4l2_fourcc('B', 'A', '1', '5') /* 16  BGRA-5-5-5-1  */
> > > +	{ V4L2_PIX_FMT_BGRA555, MEDIA_BUS_FMT_ARGB8888_1X32,
> > > +	  VI6_FMT_BGRA_5551, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > > +	  VI6_RPF_DSWAP_P_WDS,
> > > +	  1, { 16, 0, 0 }, false, false, 1, 1, true },
> >
> >
> > As I read this:
> > V4L2_PIX_FMT_BGRA555            VI6_FMT_BGRA_5551        LLS|LWS|WDS
> > gggrrrrr abbbbbgg               bbbbbggg ggrrrrra       ggrrrrra bbbbbggg
>
> Isn't V4L2_PIX_FMT_BGRA555 is defined as
>
> g1 g0 r4 r3 r2 r1 r0 a | b4 b3 b2 b1 b0 g4 g3 g2
>
Ah yes, I got fooled by how it is described in the documentation

    * .. _V4L2-PIX-FMT-BGRA555:

      - ``V4L2_PIX_FMT_BGRA555``
      - 'BA15'

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - a

      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      -

The empty line between 'a' and b4 made me think those were 2 bytes,
but apparently, they're not.

So, it's fine! Thanks for checking!

> ?
>
> > They seems different to me:
> >         gggrrrrr abbbbbgg
> >         ggrrrrra bbbbbggg
> >
> > But I have not find any better combination from table 23.10 that would
> > result in the desired 'gggrrrrr abbbbbgg' ordering.
> >
> > > +#define V4L2_PIX_FMT_BGRX555 v4l2_fourcc('B', 'X', '1', '5') /* 16  BGRX-5-5-5-1  */
> > > +	{ V4L2_PIX_FMT_BGRX555, MEDIA_BUS_FMT_ARGB8888_1X32,
> > > +	  VI6_FMT_BGRA_5551, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > > +	  VI6_RPF_DSWAP_P_WDS,
> > > +	  1, { 16, 0, 0 }, false, false, 1, 1, false },
> >
> > Same as above.
> >
> > The last two entries apart:
> > Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
> >
> > >  	{ V4L2_PIX_FMT_RGB565, MEDIA_BUS_FMT_ARGB8888_1X32,
> > >  	  VI6_FMT_RGB_565, VI6_RPF_DSWAP_P_LLS | VI6_RPF_DSWAP_P_LWS |
> > >  	  VI6_RPF_DSWAP_P_WDS,
>
> --
> Regards,
>
> Laurent Pinchart

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