6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jani Nikula <jani.nikula@xxxxxxxxx>
commit 49cc17967be95d64606d5684416ee51eec35e84a upstream.
It's not possible to use the joiner at the same time with eDP MSO. When
a panel needs MSO, it's not optional, so MSO trumps joiner.
v3: Only change intel_dp_has_joiner(), leave debugfs alone (Ville)
Fixes: bc71194e8897 ("drm/i915/edp: enable eDP MSO during link training")
Cc: <stable@xxxxxxxxxxxxxxx> # v5.13+
Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1668
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240614142311.589089-1-jani.nikula@xxxxxxxxx
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
(cherry picked from commit 8b5a92ca24eb96bb71e2a55e352687487d87687f)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -393,6 +393,10 @@ bool intel_dp_can_bigjoiner(struct intel
struct intel_encoder *encoder = &intel_dig_port->base;
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ /* eDP MSO is not compatible with joiner */
+ if (intel_dp->mso_link_count)
+ return false;
+
return DISPLAY_VER(dev_priv) >= 12 ||
(DISPLAY_VER(dev_priv) == 11 &&
encoder->port != PORT_A);
