[PATCH AUTOSEL 5.18 16/93] drm/amd/display: Fix dpp dto for disabled pipes

Sasha Levin
2022-08-11T15:53:35Z

From: Duncan Ma <duncan.ma@amd.com>

[ Upstream commit d4965c53b95d7533dfc2309d2fc25838bd33220e ]

[Why]
When switching from 1 pipe to 4to1 mpc combine,
DppDtoClk aren't enabled for the disabled pipes
pior to programming the pipes. Upon optimizing
bandwidth, DppDto are enabled causing intermittent
underflow.

[How]
Update dppclk dto whenever pipe are flagged to
enable.

Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Reviewed-by: Hansen Dsouza <Hansen.Dsouza@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Duncan Ma <duncan.ma@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>
---
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index b627c41713cc..76decaed5acd 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -1412,11 +1412,15 @@ static void dcn20_update_dchubp_dpp(
struct hubp *hubp = pipe_ctx->plane_res.hubp;
struct dpp *dpp = pipe_ctx->plane_res.dpp;
struct dc_plane_state *plane_state = pipe_ctx->plane_state;
+ struct dccg *dccg = dc->res_pool->dccg;
bool viewport_changed = false;

if (pipe_ctx->update_flags.bits.dppclk)
dpp->funcs->dpp_dppclk_control(dpp, false, true);

+ if (pipe_ctx->update_flags.bits.enable)
+ dccg->funcs->update_dpp_dto(dccg, dpp->inst, pipe_ctx->plane_res.bw.dppclk_khz);
+
/* TODO: Need input parameter to tell current DCHUB pipe tie to which OTG
* VTG is within DCHUBBUB which is commond block share by each pipe HUBP.
* VTG is 1:1 mapping with OTG. Each pipe HUBP will select which VTG
--
2.35.1