Enable passing through DSC streams to the sink in last branch devices.
v2:
- Fix the DPCD register address while setting/clearing the passthrough
flag.
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 0cdb4d176a8f9..8bc4faa142a62 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2968,6 +2968,24 @@ intel_dp_sink_set_dsc_decompression(struct intel_connector *connector,
str_enable_disable(enable));
}
+static void
+intel_dp_sink_set_dsc_passthrough(const struct intel_connector *connector,
+ bool enable)
+{
+ struct drm_i915_private *i915 = to_i915(connector->base.dev);
+ struct drm_dp_aux *aux = connector->port ?
+ connector->port->passthrough_aux : NULL;
+
+ if (!aux)
+ return;
+
+ if (write_dsc_decompression_flag(aux,
+ DP_DSC_PASSTHROUGH_EN, enable) < 0)
+ drm_dbg_kms(&i915->drm,
+ "Failed to %s sink compression passthrough state\n",
+ str_enable_disable(enable));
+}
+
/**
* intel_dp_sink_enable_decompression - Enable DSC decompression in sink/last branch device
* @state: atomic state
@@ -2994,7 +3012,7 @@ void intel_dp_sink_enable_decompression(struct intel_atomic_state *state,
!connector->dp.dsc_decompression_aux))
return;
- /* TODO: Enable passthrough in the MST last branch device if needed. */
+ intel_dp_sink_set_dsc_passthrough(connector, true);
intel_dp_sink_set_dsc_decompression(connector, true);
}
@@ -3022,7 +3040,7 @@ void intel_dp_sink_disable_decompression(struct intel_atomic_state *state,
return;
intel_dp_sink_set_dsc_decompression(connector, false);
- /* TODO: Disable passthrough in the MST last branch device if needed. */
+ intel_dp_sink_set_dsc_passthrough(connector, false);
}
static void
--
2.39.2
