drm/i915/adl-n: Add PCH Support for Alder Lake N

Add the PCH ID for ADL-N.
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220127103520.348015-1-tejaskumarx.surendrakumar.upadhyay@intel.com

drivers/gpu/drm/i915/intel_pch.c

@@ -130,6 +130,7 @@ intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id)
 	case INTEL_PCH_ADP_DEVICE_ID_TYPE:
 	case INTEL_PCH_ADP2_DEVICE_ID_TYPE:
 	case INTEL_PCH_ADP3_DEVICE_ID_TYPE:
+	case INTEL_PCH_ADP4_DEVICE_ID_TYPE:
 		drm_dbg_kms(&dev_priv->drm, "Found Alder Lake PCH\n");
 		drm_WARN_ON(&dev_priv->drm, !IS_ALDERLAKE_S(dev_priv) &&
 			    !IS_ALDERLAKE_P(dev_priv));

drivers/gpu/drm/i915/intel_pch.h

@@ -58,6 +58,7 @@ enum intel_pch {
 #define INTEL_PCH_ADP_DEVICE_ID_TYPE		0x7A80
 #define INTEL_PCH_ADP2_DEVICE_ID_TYPE		0x5180
 #define INTEL_PCH_ADP3_DEVICE_ID_TYPE		0x7A00
+#define INTEL_PCH_ADP4_DEVICE_ID_TYPE		0x5480
 #define INTEL_PCH_P2X_DEVICE_ID_TYPE		0x7100
 #define INTEL_PCH_P3X_DEVICE_ID_TYPE		0x7000
 #define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35 has 2918 */