From: Yihan Zhu <Yihan.Zhu@xxxxxxx>
[Why]
No check on head pipe during the dml to dc hw mapping will allow illegal
pipe usage. This will result in a wrong pipe topology to cause mpcc tree
totally mess up then cause a display hang.
[How]
Avoid to use the pipe is head in all check and avoid ODM slice during
preferred pipe check.
v2: Added pipe type check for DPP pipe type before executing head pipe
check in the pipe selection logic in DML2 to avoid NULL pointer
de-reference.
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Signed-off-by: Yihan Zhu <Yihan.Zhu@xxxxxxx>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
---
.../display/dc/dml2/dml2_dc_resource_mgmt.c | 23 ++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c b/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c
index 6eccf0241d85..1ed21c1b86a5 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c
@@ -258,12 +258,25 @@ static unsigned int find_preferred_pipe_candidates(const struct dc_state *existi
* However this condition comes with a caveat. We need to ignore pipes that will
* require a change in OPP but still have the same stream id. For example during
* an MPC to ODM transiton.
+ *
+ * Adding check to avoid pipe select on the head pipe by utilizing dc resource
+ * helper function resource_get_primary_dpp_pipe and comparing the pipe index.
*/
if (existing_state) {
for (i = 0; i < pipe_count; i++) {
if (existing_state->res_ctx.pipe_ctx[i].stream && existing_state->res_ctx.pipe_ctx[i].stream->stream_id == stream_id) {
+ struct pipe_ctx *head_pipe =
+ resource_is_pipe_type(&existing_state->res_ctx.pipe_ctx[i], DPP_PIPE) ?
+ resource_get_primary_dpp_pipe(&existing_state->res_ctx.pipe_ctx[i]) :
+ NULL;
+
+ // we should always respect the head pipe from selection
+ if (head_pipe && head_pipe->pipe_idx == i)
+ continue;
if (existing_state->res_ctx.pipe_ctx[i].plane_res.hubp &&
- existing_state->res_ctx.pipe_ctx[i].plane_res.hubp->opp_id != i)
+ existing_state->res_ctx.pipe_ctx[i].plane_res.hubp->opp_id != i &&
+ (existing_state->res_ctx.pipe_ctx[i].prev_odm_pipe ||
+ existing_state->res_ctx.pipe_ctx[i].next_odm_pipe))
continue;
preferred_pipe_candidates[num_preferred_candidates++] = i;
@@ -292,6 +305,14 @@ static unsigned int find_last_resort_pipe_candidates(const struct dc_state *exis
*/
if (existing_state) {
for (i = 0; i < pipe_count; i++) {
+ struct pipe_ctx *head_pipe =
+ resource_is_pipe_type(&existing_state->res_ctx.pipe_ctx[i], DPP_PIPE) ?
+ resource_get_primary_dpp_pipe(&existing_state->res_ctx.pipe_ctx[i]) :
+ NULL;
+
+ // we should always respect the head pipe from selection
+ if (head_pipe && head_pipe->pipe_idx == i)
+ continue;
if ((existing_state->res_ctx.pipe_ctx[i].plane_res.hubp &&
existing_state->res_ctx.pipe_ctx[i].plane_res.hubp->opp_id != i) ||
existing_state->res_ctx.pipe_ctx[i].stream_res.tg)
--
2.46.1
