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SubjectRe: [PATCH] drm: rcar-du: Remove packed VYUY support
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Hi Kieran,

On Friday, 14 September 2018 16:55:38 EEST Kieran Bingham wrote:
> On 14/09/18 14:51, Laurent Pinchart wrote:
> > On Friday, 14 September 2018 16:21:49 EEST Kieran Bingham wrote:
> >> The Gen3 VSP used by the DU for display does not support packed the VYUY
> >> pixel format. Gen2 VSP hardware is able to process this format, but it
> >> is not officially supported there either and thus it's output can not be
> >> guaranteed.
> >
> > I think we could guarantee proper operation on Gen2, but as DU + VSP
> > operation isn't enabled in the drivers by default, and as the VYUY format
> > isn't a strategic target, I think we can ignore that.
> >
> > How about updating the commit message as follows ?
> >
> > "The Gen3 VSP used by the DU for display does not support packed the VYUY
>
> s/packed the/the packed/
>
> Which was a fault in my original text :)
>
> > pixel format. Gen2 VSP hardware is able to process this format, but DU +
> > VSP operation isn't enabled on Gen2, and VYUY isn't a strategic format,
> > so it can be ignored."
>
> That sounds fine to me, though I don't think we would even need to state
> that 'VYUY isn't a strategic format' once it's simply not available on
> the only platform that is enabled to use the VSP. But I don't object to
> stating it otherwise.

It could be enabled in the drivers (I have out-of-tree patches for testing
purpose), so the fact that we don't need the format is still important I
think.

> >> Remove the format from the capabilities of the DU driver.
> >>
> >> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> >
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> >
> >> ---
> >>
> >> drivers/gpu/drm/rcar-du/rcar_du_vsp.c | 2 --
> >> 1 file changed, 2 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> >> b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c index 4480243813ec..4576119e7777
> >> 100644
> >> --- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> >> +++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> >> @@ -126,7 +126,6 @@ static const u32 formats_kms[] = {
> >> DRM_FORMAT_ARGB8888,
> >> DRM_FORMAT_XRGB8888,
> >> DRM_FORMAT_UYVY,
> >> - DRM_FORMAT_VYUY,
> >> DRM_FORMAT_YUYV,
> >> DRM_FORMAT_YVYU,
> >> DRM_FORMAT_NV12,
> >> @@ -155,7 +154,6 @@ static const u32 formats_v4l2[] = {
> >> V4L2_PIX_FMT_ABGR32,
> >> V4L2_PIX_FMT_XBGR32,
> >> V4L2_PIX_FMT_UYVY,
> >> - V4L2_PIX_FMT_VYUY,
> >> V4L2_PIX_FMT_YUYV,
> >> V4L2_PIX_FMT_YVYU,
> >> V4L2_PIX_FMT_NV12M,

--
Regards,

Laurent Pinchart



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