[PATCH v3] drm/radeon,amdgpu,dc: enable ABGR and XBGR formats

[Mauro Rossi]

Sending PATCH v3 series for support of {A,X}RGB pixel formats
in DCE1/R5xx and later, with separated patches for amd dc,
amdgpu and radeon, based on Alexander Deucher comments

Tested and working on R5xx (X1300), R6xx (HD2400), R7xx (HD4830),
Juniper (HD5770), Turks (HD7600M), Tahiti (HD7950), 
Bonaire (HD7790), Tonga (R9 380), Polaris (RX560) and Vega RX

Legacy radeon crtc was left unchanged, because R3xx/R4xx chipsets
do not support {A,X}BGR_8888 pixel formats natively, 
moreover the legacy code path is still based on KMS API

[PATCH v3 1/3] drm/amd/display: enable ABGR and XBGR formats (v4)
[PATCH v3 2/3] drm/amdgpu: enable ABGR and XBGR formats (v2)
[PATCH v3 3/3] drm/radeon: enable ABGR and XBGR formats (v2)