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>
(cherry picked from commit b37e1347b991459c38c56ec2476087854a4f720b)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index c587a8efeafcf5e561429d925c2893208908e03f..c17462b4c2ac1930a085eff2256f8642b9ce8830 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4256,7 +4256,12 @@ 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 &&