From: Alvin Lee <Alvin.Lee2@xxxxxxx>
[Description]
- This is a workaround to avoid concurrency issues -- a fast update
creates a shallow copy of the dc current_state, and removes all
subvp/phantom related flags.
- We want to prevent the fast update thread from removing those
flags in case there's another thread running that requires
the info for proper programming
Reviewed-by: Jun Lei <Jun.Lei@xxxxxxx>
Acked-by: Jasdeep Dhillon <jdhillon@xxxxxxx>
Signed-off-by: Alvin Lee <Alvin.Lee2@xxxxxxx>
---
drivers/gpu/drm/amd/display/dc/core/dc.c | 2 +-
.../drm/amd/display/dc/dcn32/dcn32_resource.c | 64 +++++++++++--------
.../drm/amd/display/dc/dcn32/dcn32_resource.h | 2 +-
.../drm/amd/display/dc/dml/dcn32/dcn32_fpu.c | 4 +-
.../gpu/drm/amd/display/dc/inc/core_types.h | 2 +-
5 files changed, 44 insertions(+), 30 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index a7bfe0b6a5f3..87994ae0a397 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -3061,7 +3061,7 @@ static bool update_planes_and_stream_state(struct dc *dc,
* Ensures that we have enough pipes for newly added MPO planes
*/
if (dc->res_pool->funcs->remove_phantom_pipes)
- dc->res_pool->funcs->remove_phantom_pipes(dc, context);
+ dc->res_pool->funcs->remove_phantom_pipes(dc, context, false);
/*remove old surfaces from context */
if (!dc_rem_all_planes_for_stream(dc, stream, context)) {
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
index 06489df85ac1..e4dbc8353ea3 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
@@ -1743,7 +1743,7 @@ void dcn32_retain_phantom_pipes(struct dc *dc, struct dc_state *context)
}
// return true if removed piped from ctx, false otherwise
-bool dcn32_remove_phantom_pipes(struct dc *dc, struct dc_state *context)
+bool dcn32_remove_phantom_pipes(struct dc *dc, struct dc_state *context, bool fast_update)
{
int i;
bool removed_pipe = false;
@@ -1770,14 +1770,23 @@ bool dcn32_remove_phantom_pipes(struct dc *dc, struct dc_state *context)
removed_pipe = true;
}
- // Clear all phantom stream info
- if (pipe->stream) {
- pipe->stream->mall_stream_config.type = SUBVP_NONE;
- pipe->stream->mall_stream_config.paired_stream = NULL;
- }
+ /* For non-full updates, a shallow copy of the current state
+ * is created. In this case we don't want to erase the current
+ * state (there can be 2 HIRQL threads, one in flip, and one in
+ * checkMPO) that can cause a race condition.
+ *
+ * This is just a workaround, needs a proper fix.
+ */
+ if (!fast_update) {
+ // Clear all phantom stream info
+ if (pipe->stream) {
+ pipe->stream->mall_stream_config.type = SUBVP_NONE;
+ pipe->stream->mall_stream_config.paired_stream = NULL;
+ }
- if (pipe->plane_state) {
- pipe->plane_state->is_phantom = false;
+ if (pipe->plane_state) {
+ pipe->plane_state->is_phantom = false;
+ }
}
}
return removed_pipe;
@@ -1950,23 +1959,28 @@ int dcn32_populate_dml_pipes_from_context(
pipes[pipe_cnt].pipe.src.unbounded_req_mode = false;
pipes[pipe_cnt].pipe.scale_ratio_depth.lb_depth = dm_lb_19;
- switch (pipe->stream->mall_stream_config.type) {
- case SUBVP_MAIN:
- pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_sub_viewport;
- subvp_in_use = true;
- break;
- case SUBVP_PHANTOM:
- pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_phantom_pipe;
- pipes[pipe_cnt].pipe.src.use_mall_for_static_screen = dm_use_mall_static_screen_disable;
- // Disallow unbounded req for SubVP according to DCHUB programming guide
- pipes[pipe_cnt].pipe.src.unbounded_req_mode = false;
- break;
- case SUBVP_NONE:
- pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_disable;
- pipes[pipe_cnt].pipe.src.use_mall_for_static_screen = dm_use_mall_static_screen_disable;
- break;
- default:
- break;
+ /* Only populate DML input with subvp info for full updates.
+ * This is just a workaround -- needs a proper fix.
+ */
+ if (!fast_validate) {
+ switch (pipe->stream->mall_stream_config.type) {
+ case SUBVP_MAIN:
+ pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_sub_viewport;
+ subvp_in_use = true;
+ break;
+ case SUBVP_PHANTOM:
+ pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_phantom_pipe;
+ pipes[pipe_cnt].pipe.src.use_mall_for_static_screen = dm_use_mall_static_screen_disable;
+ // Disallow unbounded req for SubVP according to DCHUB programming guide
+ pipes[pipe_cnt].pipe.src.unbounded_req_mode = false;
+ break;
+ case SUBVP_NONE:
+ pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_disable;
+ pipes[pipe_cnt].pipe.src.use_mall_for_static_screen = dm_use_mall_static_screen_disable;
+ break;
+ default:
+ break;
+ }
}
pipes[pipe_cnt].dout.dsc_input_bpc = 0;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
index 4e6b71832187..13fbc574910b 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
@@ -70,7 +70,7 @@ bool dcn32_release_post_bldn_3dlut(
struct dc_transfer_func **shaper);
bool dcn32_remove_phantom_pipes(struct dc *dc,
- struct dc_state *context);
+ struct dc_state *context, bool fast_update);
void dcn32_retain_phantom_pipes(struct dc *dc,
struct dc_state *context);
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
index 3a9b714e7138..5a4cdb559d4e 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
@@ -1203,7 +1203,7 @@ static void dcn32_full_validate_bw_helper(struct dc *dc,
// If SubVP pipe config is unsupported (or cannot be used for UCLK switching)
// remove phantom pipes and repopulate dml pipes
if (!found_supported_config) {
- dc->res_pool->funcs->remove_phantom_pipes(dc, context);
+ dc->res_pool->funcs->remove_phantom_pipes(dc, context, false);
vba->DRAMClockChangeSupport[*vlevel][vba->maxMpcComb] = dm_dram_clock_change_unsupported;
*pipe_cnt = dc->res_pool->funcs->populate_dml_pipes(dc, context, pipes, false);
@@ -1515,7 +1515,7 @@ bool dcn32_internal_validate_bw(struct dc *dc,
return false;
// For each full update, remove all existing phantom pipes first
- dc->res_pool->funcs->remove_phantom_pipes(dc, context);
+ dc->res_pool->funcs->remove_phantom_pipes(dc, context, fast_validate);
dc->res_pool->funcs->update_soc_for_wm_a(dc, context);
diff --git a/drivers/gpu/drm/amd/display/dc/inc/core_types.h b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
index 40a8096a6ccc..525f8f0b8732 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/core_types.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
@@ -240,7 +240,7 @@ struct resource_funcs {
unsigned int pipe_cnt,
unsigned int index);
- bool (*remove_phantom_pipes)(struct dc *dc, struct dc_state *context);
+ bool (*remove_phantom_pipes)(struct dc *dc, struct dc_state *context, bool fast_update);
void (*retain_phantom_pipes)(struct dc *dc, struct dc_state *context);
void (*get_panel_config_defaults)(struct dc_panel_config *panel_config);
void (*save_mall_state)(struct dc *dc, struct dc_state *context, struct mall_temp_config *temp_config);
--
2.34.1
