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drm/i915/mst: abstract choosing the MST mode to use

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Clarify the conditions for choosing the MST mode to use by adding a new
function intel_dp_mst_mode_choose(). This also prepares for being able
to extend the MST modes to single-stream sideband messaging.

Cc: Arun R Murthy <arun.r.murthy@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f626144f10b03d4609ff38a29bac013ecf3aca4e.1710839496.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Jani Nikula 2024-03-19 11:12:50 +02:00
parent 20fbb14b08
commit d4e16b8b03
1 changed files with 19 additions and 6 deletions
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25
drivers/gpu/drm/i915/display/intel_dp.c
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@ -4049,6 +4049,24 @@ static const char *intel_dp_mst_mode_str(enum drm_dp_mst_mode mst_mode)
return "SST";
}
static enum drm_dp_mst_mode
intel_dp_mst_mode_choose(struct intel_dp *intel_dp,
enum drm_dp_mst_mode sink_mst_mode)
{
struct drm_i915_private *i915 = dp_to_i915(intel_dp);
if (!i915->display.params.enable_dp_mst)
return DRM_DP_SST;
if (!intel_dp_mst_source_support(intel_dp))
return DRM_DP_SST;
if (sink_mst_mode == DRM_DP_SST_SIDEBAND_MSG)
return DRM_DP_SST;
return sink_mst_mode;
}
static enum drm_dp_mst_mode
intel_dp_mst_detect(struct intel_dp *intel_dp)
{
@ -4059,12 +4077,7 @@ intel_dp_mst_detect(struct intel_dp *intel_dp)
sink_mst_mode = drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd);
if (i915->display.params.enable_dp_mst &&
intel_dp_mst_source_support(intel_dp) &&
sink_mst_mode == DRM_DP_MST)
mst_detect = DRM_DP_MST;
else
mst_detect = DRM_DP_SST;
mst_detect = intel_dp_mst_mode_choose(intel_dp, sink_mst_mode);
drm_dbg_kms(&i915->drm,
"[ENCODER:%d:%s] MST support: port: %s, sink: %s, modparam: %s -> enable: %s\n",