6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
commit dd7eb65c493615fda7d459501c3d4a46e00ea5ba upstream.
We have no bigjoiner support in the MST code, so .mode_valid()
pretending otherwise is just going to result black screens for
users. Reject any mode that needs the joiner.
Cc: stable@xxxxxxxxxxxxxxx
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Fixes: d51f25eb479a ("drm/i915: Add DSC support to MST path")
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127145028.4899-3-ville.syrjala@xxxxxxxxxxxxxxx
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
(cherry picked from commit 9c058492b16f90bb772cb0dad567e8acc68e155d)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -955,6 +955,10 @@ intel_dp_mst_mode_valid_ctx(struct drm_c
if (intel_dp_need_bigjoiner(intel_dp, mode->hdisplay, target_clock)) {
bigjoiner = true;
max_dotclk *= 2;
+
+ /* TODO: add support for bigjoiner */
+ *status = MODE_CLOCK_HIGH;
+ return 0;
}
if (DISPLAY_VER(dev_priv) >= 10 &&
