drm/amd/display: Fix Subvp phantom pipe transition

[Description]
- When transitioning a pipe in use (non-phantom) to become
  a phantom pipe, we must fully disable the pipe first before
  doing any phantom pipe programming
- Move phantom OTG enablement to after "regular" front-end
  programming sequence (including wait for vupdate)
- If a pipe is being transitioned into a phantom pipe,
  fully disable it first

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 18 insertions, 20 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index 64fcb378594f..3f3d4daa6294 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -1310,6 +1310,19 @@ static void dcn20_detect_pipe_changes(struct pipe_ctx *old_pipe, struct pipe_ctx
 {
 	new_pipe->update_flags.raw = 0;
 
+	/* If non-phantom pipe is being transitioned to a phantom pipe,
+	 * set disable and return immediately. This is because the pipe
+	 * that was previously in use must be fully disabled before we
+	 * can "enable" it as a phantom pipe (since the OTG will certainly
+	 * be different). The post_unlock sequence will set the correct
+	 * update flags to enable the phantom pipe.
+	 */
+	if (old_pipe->plane_state && !old_pipe->plane_state->is_phantom &&
+			new_pipe->plane_state && new_pipe->plane_state->is_phantom) {
+		new_pipe->update_flags.bits.disable = 1;
+		return;
+	}
+
 	/* Exit on unchanged, unused pipe */
 	if (!old_pipe->plane_state && !new_pipe->plane_state)
 		return;
@@ -1884,26 +1897,6 @@ void dcn20_post_unlock_program_front_end(
 
 	for (i = 0; i < dc->res_pool->pipe_count; i++) {
 		struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
-		struct pipe_ctx *old_pipe = &dc->current_state->res_ctx.pipe_ctx[i];
-
-		/* If an active, non-phantom pipe is being transitioned into a phantom
-		 * pipe, wait for the double buffer update to complete first before we do
-		 * phantom pipe programming (HUBP_VTG_SEL updates right away so that can
-		 * cause issues).
-		 */
-		if (pipe->stream && pipe->stream->mall_stream_config.type == SUBVP_PHANTOM &&
-				old_pipe->stream && old_pipe->stream->mall_stream_config.type != SUBVP_PHANTOM) {
-			old_pipe->stream_res.tg->funcs->wait_for_state(
-					old_pipe->stream_res.tg,
-					CRTC_STATE_VBLANK);
-			old_pipe->stream_res.tg->funcs->wait_for_state(
-					old_pipe->stream_res.tg,
-					CRTC_STATE_VACTIVE);
-		}
-	}
-
-	for (i = 0; i < dc->res_pool->pipe_count; i++) {
-		struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
 
 		if (pipe->plane_state && !pipe->top_pipe) {
 			/* Program phantom pipe here to prevent a frame of underflow in the MPO transition
@@ -1913,6 +1906,11 @@ void dcn20_post_unlock_program_front_end(
 			 */
 			while (pipe) {
 				if (pipe->stream && pipe->stream->mall_stream_config.type == SUBVP_PHANTOM) {
+					/* When turning on the phantom pipe we want to run through the
+					 * entire enable sequence, so apply all the "enable" flags.
+					 */
+					if (dc->hwss.apply_update_flags_for_phantom)
+						dc->hwss.apply_update_flags_for_phantom(pipe);
 					if (dc->hwss.update_phantom_vp_position)
 						dc->hwss.update_phantom_vp_position(dc, context, pipe);
 					dcn20_program_pipe(dc, pipe, context);