drm/i915/mtl: Add TC port lockdep assert to AUX power well enabling

Similarly to earlier platforms, assert in the MTL AUX power well
enabling handler for TC AUX CH power wells that the TC port using the
AUX CH is locked.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230830140421.2031111-2-imre.deak@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.c b/drivers/gpu/drm/i915/display/intel_display_power_well.c
index 916009894d89c7fe20c1489736d036a1f7a9b7a7..820b7d41a0a8f9c3f78043ad0d41e2bbd8b604ca 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
@@ -1794,6 +1794,11 @@ static void xelpdp_aux_power_well_enable(struct drm_i915_private *dev_priv,
                                         struct i915_power_well *power_well)
 {
        enum aux_ch aux_ch = i915_power_well_instance(power_well)->xelpdp.aux_ch;
+       enum phy phy = icl_aux_pw_to_phy(dev_priv, power_well);
+
+       if (intel_phy_is_tc(dev_priv, phy))
+               icl_tc_port_assert_ref_held(dev_priv, power_well,
+                                           aux_ch_to_digital_port(dev_priv, aux_ch));
 
        intel_de_rmw(dev_priv, XELPDP_DP_AUX_CH_CTL(aux_ch),
                     XELPDP_DP_AUX_CH_CTL_POWER_REQUEST,