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

[ 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>

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 b0e9b05..95d8834 100644 (file)
--- 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)