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drm/amd/display: Disable DCN401 UCLK P-State support on full updates

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[WHY&HOW]
It is not guaranteed even for HW exclusive P-State methods (like
VActive) that P-state will be supported properly until optimize
bandwidth is called, so unconditionally disable it on full updates.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dillon Varone 2024-08-01 15:35:51 -04:00 • committed by Alex Deucher
parent cc2991203c
commit 67ea53a4bd
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
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@ -1401,8 +1401,8 @@ void dcn401_prepare_bandwidth(struct dc *dc,
bool p_state_change_support = context->bw_ctx.bw.dcn.clk.p_state_change_support; bool p_state_change_support = context->bw_ctx.bw.dcn.clk.p_state_change_support;
unsigned int compbuf_size_kb = 0; unsigned int compbuf_size_kb = 0;
/* Any transition into or out of a FAMS config should disable MCLK switching first to avoid hangs */ /* Any transition into P-State support should disable MCLK switching first to avoid hangs */
if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching || dc->clk_mgr->clks.fw_based_mclk_switching) { if (p_state_change_support) {
dc->optimized_required = true; dc->optimized_required = true;
context->bw_ctx.bw.dcn.clk.p_state_change_support = false; context->bw_ctx.bw.dcn.clk.p_state_change_support = false;
} }
@ -1441,7 +1441,7 @@ void dcn401_prepare_bandwidth(struct dc *dc,
dcn401_fams2_global_control_lock(dc, context, false); dcn401_fams2_global_control_lock(dc, context, false);
} }
if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching || dc->clk_mgr->clks.fw_based_mclk_switching) { if (p_state_change_support != context->bw_ctx.bw.dcn.clk.p_state_change_support) {
/* After disabling P-State, restore the original value to ensure we get the correct P-State /* After disabling P-State, restore the original value to ensure we get the correct P-State
* on the next optimize. */ * on the next optimize. */
context->bw_ctx.bw.dcn.clk.p_state_change_support = p_state_change_support; context->bw_ctx.bw.dcn.clk.p_state_change_support = p_state_change_support;