[PATCH 14/24] drm/amd/display: Disable DCN401 UCLK P-State support on full updates

[Tom Chung]

From: Dillon Varone <dillon.var...@amd.com>

[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.l...@amd.com>
Signed-off-by: Dillon Varone <dillon.var...@amd.com>
Signed-off-by: Tom Chung <chiahsuan.ch...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c 
b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
index b604c8886ef4..ac0a21ac318f 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
@@ -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;
        unsigned int compbuf_size_kb = 0;
 
-       /* Any transition into or out of a FAMS config 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) {
+       /* Any transition into P-State support should disable MCLK switching 
first to avoid hangs */
+       if (p_state_change_support) {
                dc->optimized_required = true;
                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);
        }
 
-       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
                 * on the next optimize. */
                context->bw_ctx.bw.dcn.clk.p_state_change_support = 
p_state_change_support;
-- 
2.34.1