drm/i915/adl_p: enable MSO on pipe B

On ADL-P, it's possible to enable the stream splitter on pipe B in
addition to pipe A.

Bspec: 50174
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210526082903.26395-1-jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 3d89186..4d6f1a2 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4729,9 +4729,12 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 
                dig_port->hpd_pulse = intel_dp_hpd_pulse;
 
-               /* Splitter enable for eDP MSO is supported for pipe A only. */
-               if (dig_port->dp.mso_link_count)
+               /* Splitter enable for eDP MSO is limited to certain pipes. */
+               if (dig_port->dp.mso_link_count) {
                        encoder->pipe_mask = BIT(PIPE_A);
+                       if (IS_ALDERLAKE_P(dev_priv))
+                               encoder->pipe_mask |= BIT(PIPE_B);
+               }
        }
 
        /* In theory we don't need the encoder->type check, but leave it just in