drm/amd/display: Fix Vega10 black screen after mode change

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[Why]
The sequence is slightly changed when bring .set_bandwidth out
from the end of programming backend to the end of programming
surface. Vega10 doesn't like to get clocks updated if
stream_count is zero in the current context (Atomic Reset).

[How]
Do not update clocks if no stream is showing up in the context.

Fixes 1b2b130192 "dc: Remove 300Mhz minimum disp clk limit."

Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Jerry (Fangzhi) Zuo 2018-07-17 11:53:54 -04:00 • committed by Alex Deucher

parent 65c78961b3

commit f358b39d18

3 changed files with 16 additions and 1 deletions

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2

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

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5

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.h

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10

drivers/gpu/drm/amd/display/dc/dce120/dce120_hw_sequencer.c

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