drm/amd/display: Compensate for XGMI SS downspread on dprefclk

Browse source

[Why]
When XGMI is enabled, we need to adjust the dprefclk according to the
WAFL link's spread spectrum info. This is for VG20 (DCE121) only.

[How]
dce_clk_mgr already stores SS info, currently being used by audio clock.
Therefore, patch the clk_mgr's SS info with the xGMI SS info, if xGMI
is enabled. For display clock, adjust it during dce12_update_clocks()
before calling set_clock().

Since we rely on a mmhub register to reliably determine if xGMI is
enabled, the patching step needs to happen after resource_construct()
has initialized the hardware sequencer.

Signed-off-by: Leo Li <sunpeng.li@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Leo Li 2018-11-01 11:10:18 -04:00 • committed by Alex Deucher

parent 09f609c34f

commit 508f5fcb54

6 changed files with 198 additions and 10 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

64

drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c

View file

35

drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.h

View file

12

drivers/gpu/drm/amd/display/dc/dce/dce_hwseq.h

View file

15

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

View file

1

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

View file

81

drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c

View file