Re: [PATCH 5.10.y] drm/amd/display: enable cursor degamma for DCN3+ DRM legacy gamma

[Greg KH <greg@kroah.com>]

On Tue, Sep 19, 2023 at 03:59:36PM -0100, Melissa Wen wrote:
> For DRM legacy gamma, AMD display manager applies implicit sRGB degamma
> using a pre-defined sRGB transfer function. It works fine for DCN2
> family where degamma ROM and custom curves go to the same color block.
> But, on DCN3+, degamma is split into two blocks: degamma ROM for
> pre-defined TFs and `gamma correction` for user/custom curves and
> degamma ROM settings doesn't apply to cursor plane. To get DRM legacy
> gamma working as expected, enable cursor degamma ROM for implict sRGB
> degamma on HW with this configuration.
> 
> Cc: stable@vger.kernel.org
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2803
> Fixes: 96b020e2163f ("drm/amd/display: check attr flag before set cursor degamma on DCN3+")
> Signed-off-by: Melissa Wen <mwen@igalia.com>
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> (cherry picked from commit 57a943ebfcdb4a97fbb409640234bdb44bfa1953)
> Signed-off-by: Melissa Wen <mwen@igalia.com>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 

Both now queued up, thanks.

greg k-h