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drm/i915/mst: Reject modes that require the bigjoiner

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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 <stanislav.lisovskiy@intel.com>
Fixes: d51f25eb47 ("drm/i915: Add DSC support to MST path")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127145028.4899-3-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
(cherry picked from commit 9c058492b16f90bb772cb0dad567e8acc68e155d)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ville Syrjälä
2023-11-27 16:50:27 +02:00
committed by Greg Kroah-Hartman
parent 654748c6fc
commit a0396af35c
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/display/intel_dp_mst.c
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@@ -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 &&