drm/i915: Disable port sync when bigjoiner is used

The current modeset sequence can't handle port sync and bigjoiner
at the same time. Refuse port sync when bigjoiner is needed,
at least until we fix the modeset sequence.

v2: Add a FIXME (Vandite)

Cc: stable@vger.kernel.org
Tested-by: Vidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240404213441.17637-4-ville.syrjala@linux.intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 8a4dfd561c34b5509bdc926ff9fd7051972de351..793ef3e387c6cb677bc098e181a5af3c4e30e85f 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4243,7 +4243,12 @@ static bool m_n_equal(const struct intel_link_m_n *m_n_1,
 static bool crtcs_port_sync_compatible(const struct intel_crtc_state *crtc_state1,
                                       const struct intel_crtc_state *crtc_state2)
 {
+       /*
+        * FIXME the modeset sequence is currently wrong and
+        * can't deal with bigjoiner + port sync at the same time.
+        */
        return crtc_state1->hw.active && crtc_state2->hw.active &&
+               !crtc_state1->bigjoiner_pipes && !crtc_state2->bigjoiner_pipes &&
                crtc_state1->output_types == crtc_state2->output_types &&
                crtc_state1->output_format == crtc_state2->output_format &&
                crtc_state1->lane_count == crtc_state2->lane_count &&