drm/amd/display: add get primary dpp pipe resource interface

[why]
Need to have a helper function to find the primary dp pipe of the plane
associated with a dpp pipe

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 8a8f8560605a..5a6f458b2942 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -1807,6 +1807,20 @@ struct pipe_ctx *resource_get_opp_head(const struct pipe_ctx *pipe_ctx)
 	return opp_head;
 }
 
+struct pipe_ctx *resource_get_primary_dpp_pipe(const struct pipe_ctx *dpp_pipe)
+{
+	struct pipe_ctx *pri_dpp_pipe = (struct pipe_ctx *) dpp_pipe;
+
+	ASSERT(resource_is_pipe_type(dpp_pipe, DPP_PIPE));
+	while (pri_dpp_pipe->prev_odm_pipe)
+		pri_dpp_pipe = pri_dpp_pipe->prev_odm_pipe;
+	while (pri_dpp_pipe->top_pipe &&
+			pri_dpp_pipe->top_pipe->plane_state == pri_dpp_pipe->plane_state)
+		pri_dpp_pipe = pri_dpp_pipe->top_pipe;
+	return pri_dpp_pipe;
+}
+
+
 int resource_get_mpc_slice_index(const struct pipe_ctx *pipe_ctx)
 {
 	struct pipe_ctx *split_pipe = pipe_ctx->top_pipe;