[PATCH AUTOSEL 5.7 116/274] drm/amd/display: Correct updating logic of dcn21's pipe VM flags

Sasha Levin
2020-06-09T00:58:58Z

From: Dale Zhao <dale.zhao@amd.com>

[ Upstream commit 2a28fe92220a116735ef45939b7edcfee83cc6b0 ]

[Why]:
Renoir's pipe VM flags are not correctly updated if pipe strategy has
changed during some scenarios. It will result in watermarks mistakenly
calculation, thus underflow and garbage appear.

[How]:
Correctly update pipe VM flags to pipes which have been populated.

Signed-off-by: Dale Zhao <dale.zhao@amd.com>
Signed-off-by: Sung Lee <sung.lee@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@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/dcn21/dcn21_resource.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
index a721bb401ef0..6d1736cf5c12 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
@@ -1694,12 +1694,8 @@ static int dcn21_populate_dml_pipes_from_context(
{
uint32_t pipe_cnt = dcn20_populate_dml_pipes_from_context(dc, context, pipes);
int i;
- struct resource_context *res_ctx = &context->res_ctx;

- for (i = 0; i < dc->res_pool->pipe_count; i++) {
-
- if (!res_ctx->pipe_ctx[i].stream)
- continue;
+ for (i = 0; i < pipe_cnt; i++) {

pipes[i].pipe.src.hostvm = 1;
pipes[i].pipe.src.gpuvm = 1;
--
2.25.1