6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ville Syrjälä ville.syrjala@linux.intel.com
commit 0653d501409eeb9f1deb7e4c12e4d0d2c9f1cba1 upstream.
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.s... Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com (cherry picked from commit b37e1347b991459c38c56ec2476087854a4f720b) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/display/intel_ddi.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -4111,7 +4111,12 @@ static bool m_n_equal(const struct intel 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 &&