[PATCH AUTOSEL 5.7 127/274] drm/amd/display: Do not disable pipe split if mode is not supported

Sasha Levin
2020-06-09T00:57:00Z

From: Sung Lee <sung.lee@amd.com>

[ Upstream commit 1dfedb39d38f813357885e19badd1971c17f79a7 ]

[WHY]
If mode is not supported, pipe split should not be disabled.
This may cause more modes to fail.

[HOW]
Check for mode support before disabling pipe split.

This commit was previously reverted as it was thought to
have problems, but those issues have been resolved.

Signed-off-by: Sung Lee <sung.lee@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@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_resource.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
index e4348e3b6389..2719cdecc1cb 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
@@ -2597,19 +2597,24 @@ int dcn20_validate_apply_pipe_split_flags(

/* Avoid split loop looks for lowest voltage level that allows most unsplit pipes possible */
if (avoid_split) {
+ int max_mpc_comb = context->bw_ctx.dml.vba.maxMpcComb;
+
for (i = 0, pipe_idx = 0; i < dc->res_pool->pipe_count; i++) {
if (!context->res_ctx.pipe_ctx[i].stream)
continue;

for (vlevel_split = vlevel; vlevel <= context->bw_ctx.dml.soc.num_states; vlevel++)
- if (context->bw_ctx.dml.vba.NoOfDPP[vlevel][0][pipe_idx] == 1)
+ if (context->bw_ctx.dml.vba.NoOfDPP[vlevel][0][pipe_idx] == 1 &&
+ context->bw_ctx.dml.vba.ModeSupport[vlevel][0])
break;
/* Impossible to not split this pipe */
if (vlevel > context->bw_ctx.dml.soc.num_states)
vlevel = vlevel_split;
+ else
+ max_mpc_comb = 0;
pipe_idx++;
}
- context->bw_ctx.dml.vba.maxMpcComb = 0;
+ context->bw_ctx.dml.vba.maxMpcComb = max_mpc_comb;
}

/* Split loop sets which pipe should be split based on dml outputs and dc flags */
--
2.25.1