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drm/amd/display: Allow PSTATE chnage when no displays are enabled

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[ Upstream commit 8bc3d461d0 ]

[Why]
When no displays are currently enabled, display driver should not
disallow PSTATE switching.

[How]
Allow PSTATE switching if either the active configuration supports it,
or there are no active displays.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <anson.jacob@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Aric Cyr
2020-10-29 17:45:19 -04:00
committed by Greg Kroah-Hartman
parent af2fc0f4ac
commit a2245a9955
1 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c
View File

@@ -239,6 +239,7 @@ static void dcn3_update_clocks(struct clk_mgr *clk_mgr_base,
struct dmcu *dmcu = clk_mgr_base->ctx->dc->res_pool->dmcu;
bool force_reset = false;
bool update_uclk = false;
bool p_state_change_support;
if (dc->work_arounds.skip_clock_update || !clk_mgr->smu_present)
return;
@@ -279,8 +280,9 @@ static void dcn3_update_clocks(struct clk_mgr *clk_mgr_base,
clk_mgr_base->clks.socclk_khz = new_clocks->socclk_khz;
clk_mgr_base->clks.prev_p_state_change_support = clk_mgr_base->clks.p_state_change_support;
if (should_update_pstate_support(safe_to_lower, new_clocks->p_state_change_support, clk_mgr_base->clks.p_state_change_support)) {
clk_mgr_base->clks.p_state_change_support = new_clocks->p_state_change_support;
p_state_change_support = new_clocks->p_state_change_support || (display_count == 0);
if (should_update_pstate_support(safe_to_lower, p_state_change_support, clk_mgr_base->clks.p_state_change_support)) {
clk_mgr_base->clks.p_state_change_support = p_state_change_support;
/* to disable P-State switching, set UCLK min = max */
if (!clk_mgr_base->clks.p_state_change_support)