[Intel-gfx] [PATCH 1/4] drm/i915/mst: Swap TRANSCONF vs. FECSTALL_DIS_DPTSTREAM_DPTTG disable

[Ville Syrjala]

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

The DP modeset sequence asks us to disable TRANSCONF before clearing
the FECSTALL_DIS_DPTSTREAM_DPTTG bit, although we are still asked
to wait for the transcoder to stop only after both steps have
been done.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 28d85e1e858e..a994fc2319a3 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -485,6 +485,8 @@ void intel_disable_transcoder(const struct intel_crtc_state *old_crtc_state)
 	if (!IS_I830(dev_priv))
 		val &= ~TRANSCONF_ENABLE;
 
+	intel_de_write(dev_priv, reg, val);
+
 	if (DISPLAY_VER(dev_priv) >= 14)
 		intel_de_rmw(dev_priv, MTL_CHICKEN_TRANS(cpu_transcoder),
 			     FECSTALL_DIS_DPTSTREAM_DPTTG, 0);
@@ -492,7 +494,6 @@ void intel_disable_transcoder(const struct intel_crtc_state *old_crtc_state)
 		intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder),
 			     FECSTALL_DIS_DPTSTREAM_DPTTG, 0);
 
-	intel_de_write(dev_priv, reg, val);
 	if ((val & TRANSCONF_ENABLE) == 0)
 		intel_wait_for_pipe_off(old_crtc_state);
 }
-- 
2.41.0