drm/i915/mtl: Add DP AUX support on TypeC ports

On MTL TypeC ports the AUX_CH_CTL and AUX_CH_DATA addresses have
changed wrt. previous platforms, adjust the code accordingly.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220902060342.151824-8-radhakrishna.sripada@intel.com

drivers/gpu/drm/i915/display/intel_dp_aux.c

@@ -637,6 +637,46 @@ static i915_reg_t tgl_aux_data_reg(struct intel_dp *intel_dp, int index)
 	}
 }
 
+static i915_reg_t xelpdp_aux_ctl_reg(struct intel_dp *intel_dp)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	enum aux_ch aux_ch = dig_port->aux_ch;
+
+	switch (aux_ch) {
+	case AUX_CH_A:
+	case AUX_CH_B:
+	case AUX_CH_USBC1:
+	case AUX_CH_USBC2:
+	case AUX_CH_USBC3:
+	case AUX_CH_USBC4:
+		return XELPDP_DP_AUX_CH_CTL(aux_ch);
+	default:
+		MISSING_CASE(aux_ch);
+		return XELPDP_DP_AUX_CH_CTL(AUX_CH_A);
+	}
+}
+
+static i915_reg_t xelpdp_aux_data_reg(struct intel_dp *intel_dp, int index)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	enum aux_ch aux_ch = dig_port->aux_ch;
+
+	switch (aux_ch) {
+	case AUX_CH_A:
+	case AUX_CH_B:
+	case AUX_CH_USBC1:
+	case AUX_CH_USBC2:
+	case AUX_CH_USBC3:
+	case AUX_CH_USBC4:
+		return XELPDP_DP_AUX_CH_DATA(aux_ch, index);
+	default:
+		MISSING_CASE(aux_ch);
+		return XELPDP_DP_AUX_CH_DATA(AUX_CH_A, index);
+	}
+}
+
 void intel_dp_aux_fini(struct intel_dp *intel_dp)
 {
 	if (cpu_latency_qos_request_active(&intel_dp->pm_qos))
@@ -652,7 +692,10 @@ void intel_dp_aux_init(struct intel_dp *intel_dp)
 	struct intel_encoder *encoder = &dig_port->base;
 	enum aux_ch aux_ch = dig_port->aux_ch;
 
-	if (DISPLAY_VER(dev_priv) >= 12) {
+	if (DISPLAY_VER(dev_priv) >= 14) {
+		intel_dp->aux_ch_ctl_reg = xelpdp_aux_ctl_reg;
+		intel_dp->aux_ch_data_reg = xelpdp_aux_data_reg;
+	} else if (DISPLAY_VER(dev_priv) >= 12) {
 		intel_dp->aux_ch_ctl_reg = tgl_aux_ctl_reg;
 		intel_dp->aux_ch_data_reg = tgl_aux_data_reg;
 	} else if (DISPLAY_VER(dev_priv) >= 9) {

drivers/gpu/drm/i915/i915_reg.h

@@ -3465,6 +3465,20 @@
 						       _XELPDP_USBC3_AUX_CH_CTL, \
 						       _XELPDP_USBC4_AUX_CH_CTL))
 
+#define _XELPDP_USBC1_AUX_CH_DATA1      0x16F214
+#define _XELPDP_USBC2_AUX_CH_DATA1      0x16F414
+#define _XELPDP_USBC3_AUX_CH_DATA1      0x16F614
+#define _XELPDP_USBC4_AUX_CH_DATA1      0x16F814
+
+#define XELPDP_DP_AUX_CH_DATA(aux_ch, i)	_MMIO(_PICK(aux_ch, \
+						       _DPA_AUX_CH_DATA1, \
+						       _DPB_AUX_CH_DATA1, \
+						       0, /* port/aux_ch C is non-existent */ \
+						       _XELPDP_USBC1_AUX_CH_DATA1, \
+						       _XELPDP_USBC2_AUX_CH_DATA1, \
+						       _XELPDP_USBC3_AUX_CH_DATA1, \
+						       _XELPDP_USBC4_AUX_CH_DATA1) + (i) * 4)
+
 #define   DP_AUX_CH_CTL_SEND_BUSY	    (1 << 31)
 #define   DP_AUX_CH_CTL_DONE		    (1 << 30)
 #define   DP_AUX_CH_CTL_INTERRUPT	    (1 << 29)