From: Aric Cyr aric.cyr@amd.com

[ Upstream commit 8bc3d461d0a95bbcc2a0a908bbadc87e198a86a8 ]

[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 --- .../gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c index b0e9b0509568c..95d883482227e 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c @@ -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)