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drm/malidp: Fix writeback in NV12
When we want to writeback to memory in NV12 format we need to program the RGB2YUV coefficients. Currently, we don't program the coefficients and NV12 doesn't work at all. This patchset fixes that by programming a sane default(bt709, limited range) as rgb2yuv coefficients. In the long run, probably we need to think of a way for userspace to be able to program that, but for now I think this is better than not working at all or not advertising NV12 as a supported format for memwrite. Changes since v1: - Write the rgb2yuv coefficients only once, since we don't change them at all, just write them the first time NV12 is programmed, suggested by Brian Starkey, here   https://lists.freedesktop.org/archives/dri-devel/2018-August/186819.html Signed-off-by: Alexandru Gheorghe <email@example.com> Acked-by: Liviu Dudau <firstname.lastname@example.org> Signed-off-by: Liviu Dudau <email@example.com>
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