[PATCH 6.1.y 08/10] drm/amd/display: Retain phantom plane/stream if validation fails

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From: Alvin Lee <Alvin.Lee2@xxxxxxx>

[Description]
- If we fail validation, we should retain the phantom
  stream/planes
- Full updates assume that phantom pipes will be fully
  removed, but if validation fails we keep the phantom
  pipes
- Therefore we have to retain the plane/stream if validation
  fails (since the refcount is decremented before validation,
  and the expectation is that it's fully freed when the  old
  dc_state is released)

Reviewed-by: Jun Lei <Jun.Lei@xxxxxxx>
Acked-by: Brian Chang <Brian.Chang@xxxxxxx>
Signed-off-by: Alvin Lee <Alvin.Lee2@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
(cherry picked from commit 9b216b7e38f5381bcc3ad21c5ac614aa577ab8f2)
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c      | 13 +++++++++++
 .../drm/amd/display/dc/dcn32/dcn32_resource.c | 22 +++++++++++++++++++
 .../drm/amd/display/dc/dcn32/dcn32_resource.h |  3 +++
 .../amd/display/dc/dcn321/dcn321_resource.c   |  1 +
 .../gpu/drm/amd/display/dc/inc/core_types.h   |  1 +
 5 files changed, 40 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index f16a9e410d16..674ab6d9b31e 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -3149,6 +3149,19 @@ static bool update_planes_and_stream_state(struct dc *dc,
 
 	if (update_type == UPDATE_TYPE_FULL) {
 		if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) {
+			/* For phantom pipes we remove and create a new set of phantom pipes
+			 * for each full update (because we don't know if we'll need phantom
+			 * pipes until after the first round of validation). However, if validation
+			 * fails we need to keep the existing phantom pipes (because we don't update
+			 * the dc->current_state).
+			 *
+			 * The phantom stream/plane refcount is decremented for validation because
+			 * we assume it'll be removed (the free comes when the dc_state is freed),
+			 * but if validation fails we have to increment back the refcount so it's
+			 * consistent.
+			 */
+			if (dc->res_pool->funcs->retain_phantom_pipes)
+				dc->res_pool->funcs->retain_phantom_pipes(dc, dc->current_state);
 			BREAK_TO_DEBUGGER();
 			goto fail;
 		}
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 814620e6638f..2b8700b291a4 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
@@ -1719,6 +1719,27 @@ static struct dc_stream_state *dcn32_enable_phantom_stream(struct dc *dc,
 	return phantom_stream;
 }
 
+void dcn32_retain_phantom_pipes(struct dc *dc, struct dc_state *context)
+{
+	int i;
+	struct dc_plane_state *phantom_plane = NULL;
+	struct dc_stream_state *phantom_stream = NULL;
+
+	for (i = 0; i < dc->res_pool->pipe_count; i++) {
+		struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
+
+		if (!pipe->top_pipe && !pipe->prev_odm_pipe &&
+				pipe->plane_state && pipe->stream &&
+				pipe->stream->mall_stream_config.type == SUBVP_PHANTOM) {
+			phantom_plane = pipe->plane_state;
+			phantom_stream = pipe->stream;
+
+			dc_plane_state_retain(phantom_plane);
+			dc_stream_retain(phantom_stream);
+		}
+	}
+}
+
 // return true if removed piped from ctx, false otherwise
 bool dcn32_remove_phantom_pipes(struct dc *dc, struct dc_state *context)
 {
@@ -2035,6 +2056,7 @@ static struct resource_funcs dcn32_res_pool_funcs = {
 	.update_soc_for_wm_a = dcn30_update_soc_for_wm_a,
 	.add_phantom_pipes = dcn32_add_phantom_pipes,
 	.remove_phantom_pipes = dcn32_remove_phantom_pipes,
+	.retain_phantom_pipes = dcn32_retain_phantom_pipes,
 };
 
 static uint32_t read_pipe_fuses(struct dc_context *ctx)
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 615244a1f95d..026cf13d203f 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
@@ -83,6 +83,9 @@ bool dcn32_release_post_bldn_3dlut(
 bool dcn32_remove_phantom_pipes(struct dc *dc,
 		struct dc_state *context);
 
+void dcn32_retain_phantom_pipes(struct dc *dc,
+		struct dc_state *context);
+
 void dcn32_add_phantom_pipes(struct dc *dc,
 		struct dc_state *context,
 		display_e2e_pipe_params_st *pipes,
diff --git a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c
index 213ff3672bd5..aed92ced7b76 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c
@@ -1619,6 +1619,7 @@ static struct resource_funcs dcn321_res_pool_funcs = {
 	.update_soc_for_wm_a = dcn30_update_soc_for_wm_a,
 	.add_phantom_pipes = dcn32_add_phantom_pipes,
 	.remove_phantom_pipes = dcn32_remove_phantom_pipes,
+	.retain_phantom_pipes = dcn32_retain_phantom_pipes,
 };
 
 static uint32_t read_pipe_fuses(struct dc_context *ctx)
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 9498105c98ab..5fa7c4772af4 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/core_types.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
@@ -234,6 +234,7 @@ struct resource_funcs {
             unsigned int index);
 
 	bool (*remove_phantom_pipes)(struct dc *dc, struct dc_state *context);
+	void (*retain_phantom_pipes)(struct dc *dc, struct dc_state *context);
 	void (*get_panel_config_defaults)(struct dc_panel_config *panel_config);
 };
 
-- 
2.34.1




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