drm/i915/icp: Add the ID for ICL PCH - ICP

Add the PCI ID for the ICL PCH - ICP.

v2: rebased.
v3: rebased.
v4: fix ICP name.
v5: fix the ID mask (Fei Li).
v6 (from Paulo): bikesheds.

Cc: Li, Fei <fei.li@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180111180010.24357-9-paulo.r.zanoni@intel.com

drivers/gpu/drm/i915/i915_drv.c

@@ -252,6 +252,10 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 				DRM_DEBUG_KMS("Found Cannon Lake LP PCH (CNP-LP)\n");
 				WARN_ON(!IS_CANNONLAKE(dev_priv) &&
 					!IS_COFFEELAKE(dev_priv));
+			} else if (id == INTEL_PCH_ICP_DEVICE_ID_TYPE) {
+				dev_priv->pch_type = PCH_ICP;
+				DRM_DEBUG_KMS("Found Ice Lake PCH\n");
+				WARN_ON(!IS_ICELAKE(dev_priv));
 			} else if (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
 				   id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
 				   (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&

drivers/gpu/drm/i915/i915_drv.h

@@ -2845,6 +2845,7 @@ intel_info(const struct drm_i915_private *dev_priv)
 #define INTEL_PCH_KBP_DEVICE_ID_TYPE		0xA280
 #define INTEL_PCH_CNP_DEVICE_ID_TYPE		0xA300
 #define INTEL_PCH_CNP_LP_DEVICE_ID_TYPE		0x9D80
+#define INTEL_PCH_ICP_DEVICE_ID_TYPE		0x3480
 #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 */