[Intel-gfx] [PATCH 3/4] drm/i915/vrr: Reorder transcoder vs. vrr enable/disable

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

On mtl it looks like disabling VRR after the transcoder has
been disabled can cause the pipe/transcoder to get stuck
when re-enabled in non-vrr mode. Reversing the order seems to
help.

Bspec is extremely confused about the VRR enable/disable sequence
anyway, and this now more closely matches the non-modeset VRR
sequence, whereas the full modeset sequence still claims that
the original order is fine. But since we eventually want to toggle
VRR without a full modeset anyway this seems like the better order
to follow.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 5f9a2410fc4c..69595cbb2766 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -2726,10 +2726,10 @@ static void intel_ddi_post_disable(struct intel_atomic_state *state,
 	if (!intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_DP_MST)) {
 		intel_crtc_vblank_off(old_crtc_state);
 
-		intel_disable_transcoder(old_crtc_state);
-
 		intel_vrr_disable(old_crtc_state);
 
+		intel_disable_transcoder(old_crtc_state);
+
 		intel_ddi_disable_transcoder_func(old_crtc_state);
 
 		intel_dsc_disable(old_crtc_state);
@@ -2946,13 +2946,13 @@ static void intel_enable_ddi(struct intel_atomic_state *state,
 	if (!intel_crtc_is_bigjoiner_slave(crtc_state))
 		intel_ddi_enable_transcoder_func(encoder, crtc_state);
 
-	intel_vrr_enable(encoder, crtc_state);
-
 	/* Enable/Disable DP2.0 SDP split config before transcoder */
 	intel_audio_sdp_split_update(encoder, crtc_state);
 
 	intel_enable_transcoder(crtc_state);
 
+	intel_vrr_enable(encoder, crtc_state);
+
 	intel_crtc_vblank_on(crtc_state);
 
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
-- 
2.37.4