[Intel-gfx] [PATCH] drm/i915: The hw does not support source offsets into a YUV linear fb

[Chris Wilson]

On Tue, 18 Dec 2012 23:57:05 +0100, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Tue, Dec 18, 2012 at 11:51 PM, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > As we can only pass in the base address of the first plane, we can not
> > control the offset into the subsampled chroma planes. This means that we
> > cannot support a source offset into a YUV* linear framebuffer. However,
> > for tiled framebuffers we can tell the hardware which pixels to read
> > from. So if we see a source offset into a linear YUV framebuffer, report
> > the invalid value back to userspace.
> >
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> 
> Aren't all the yuv formats we support packet planar? So I think we
> should be able to support source offsets, as long as x is even ...
> Probably not worth the bother though.

Didn't seem to work, so I opted to just avoid the issue.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre