From a0396af35ca2010a129dda039fdf71358d5035be Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Mon, 27 Nov 2023 16:50:27 +0200 Subject: [PATCH] drm/i915/mst: Reject modes that require the bigjoiner MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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@vger.kernel.org Cc: Stanislav Lisovskiy Fixes: d51f25eb479a ("drm/i915: Add DSC support to MST path") Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20231127145028.4899-3-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula (cherry picked from commit 9c058492b16f90bb772cb0dad567e8acc68e155d) Signed-off-by: Jani Nikula Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/display/intel_dp_mst.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index ccea5ea..7a3d024 100644 --- 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_connector *connector, 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 && -- 2.7.4