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drm/amd/display: Use DTBCLK as refclk instead of DPREFCLK

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[ Upstream commit 4a30cc2bd281fa176a68b5305cd3695d636152ad ]

[Why]
Flash of corruption observed when UCLK switching after transitioning
from DTBCLK to DPREFCLK on subVP(DP) + subVP(HDMI) config
Scenario where DPREFCLK is required instead of DTBCLK is not expected

[How]
Always set the DTBCLK source as DTBCLK0

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Austin Zheng <austin.zheng@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Austin Zheng 2023-07-26 10:40:48 -04:00 committed by Greg Kroah-Hartman
parent 2d027da82a
commit 506d2ee72a
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c
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@ -290,7 +290,8 @@ static void dccg32_set_dpstreamclk(
struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg);
/* set the dtbclk_p source */
dccg32_set_dtbclk_p_src(dccg, src, otg_inst);
/* always program refclk as DTBCLK. No use-case expected to require DPREFCLK as refclk */
dccg32_set_dtbclk_p_src(dccg, DTBCLK0, otg_inst);
/* enabled to select one of the DTBCLKs for pipe */
switch (dp_hpo_inst) {