drm/amd/display: Get fb base and fb offset for DMUB from registers

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[Why]
Under some hardware initialization sequences the fb base/fb offset
provided can be zero or hardwareinit can happen too late.

We want to ensure that we always have the correct fb_base/fb_offset
when performing DMCUB hardware initialization so we can do DMCUB
command table offloading during first dc hardware init.

[How]
Read from the DCN registers. VBIOS already filled these in for us.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Nicholas Kazlauskas 2020-01-06 10:29:13 -05:00 • committed by Alex Deucher

parent 07d4f90532

commit 153ca76021

3 changed files with 27 additions and 4 deletions

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2

drivers/gpu/drm/amd/display/dmub/inc/dmub_srv.h

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21

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.c

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8

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.h

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