drm/amd/display: Fix 6x4K displays light-up on Vega20 (v2)

BugLink: https://bugs.launchpad.net/bugs/1837257
[ Upstream commit c6888879fd55b1ba903c2a770127edbf6aef6f27 ]

[Why]
More than 4x4K didn't lightup on Vega20 due to low dcfclk value.
Powerplay expects valid min requirement for dcfclk from DC.

[How]
Update min_dcfclock_khz based on min_engine_clock value.

v2: backport to 4.20 (Alex)

Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index b01764c9453f5fa564aad4a4ca764613725c514f..e590c87651d1ecc4e095d3df92dd1ee11fe005ce 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -2684,6 +2684,8 @@ static void pplib_apply_display_requirements(
                        dc,
                        context->bw.dce.sclk_khz);
 
+       pp_display_cfg->min_dcfclock_khz = pp_display_cfg->min_engine_clock_khz;
+
        pp_display_cfg->min_engine_clock_deep_sleep_khz
                        = context->bw.dce.sclk_deep_sleep_khz;