[Intel-gfx] [PATCH] drm/i915: Split a setting of MSA to MST and SST

[Gwan-gyeong Mun]

The setting of MSA is done by the DDI .pre_enable() hook. And when we are
using MST, the MSA is only set to first mst stream by calling of
DDI .pre_eanble() hook. It raies issues to non-first mst streams.
Wrong MSA or missed MSA packets might show scrambled screen or wrong
screen.

This splits a setting of MSA to MST and SST cases. And In the MST case it
will call a setting of MSA after an allocating of Virtual Channel from
MST encoder pre_enable callback.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=112212
Fixes: 0c06fa156006 ("drm/i915/dp: Add support of BT.2020 Colorimetry to DP MSA")
Fixes: d4a415dcda35 ("drm/i915: Fix MST oops due to MSA changes")
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c    | 10 ++++++----
 drivers/gpu/drm/i915/display/intel_dp_mst.c |  3 +++
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index c91521bcf06a..ef41fa0f77f0 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -1794,10 +1794,8 @@ void intel_ddi_set_dp_msa(const struct intel_crtc_state *crtc_state,
 	 * of Color Encoding Format and Content Color Gamut] while sending
 	 * YCBCR 420, HDR BT.2020 signals we should program MSA MISC1 fields
 	 * which indicate VSC SDP for the Pixel Encoding/Colorimetry Format.
-	 *
-	 * FIXME MST doesn't pass in the conn_state
 	 */
-	if (conn_state && intel_dp_needs_vsc_sdp(crtc_state, conn_state))
+	if (intel_dp_needs_vsc_sdp(crtc_state, conn_state))
 		temp |= DP_MSA_MISC_COLOR_VSC_SDP;
 
 	I915_WRITE(TRANS_MSA_MISC(cpu_transcoder), temp);
@@ -3606,7 +3604,11 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
 	else
 		hsw_ddi_pre_enable_dp(encoder, crtc_state, conn_state);
 
-	intel_ddi_set_dp_msa(crtc_state, conn_state);
+	/* MST will call a setting of MSA after an allocating of Virtual Channel
+	 * from MST encoder pre_enable callback.
+	 */
+	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST))
+		intel_ddi_set_dp_msa(crtc_state, conn_state);
 }
 
 static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 5e267c5b4c20..cb77f8072820 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -345,6 +345,9 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 	 */
 	if (INTEL_GEN(dev_priv) < 12 || !first_mst_stream)
 		intel_ddi_enable_pipe_clock(pipe_config);
+
+	intel_ddi_set_dp_msa(pipe_config, conn_state);
+
 }
 
 static void intel_mst_enable_dp(struct intel_encoder *encoder,
-- 
2.23.0