drm/i915/ehl: Add ElkhartLake platform

Add ElkhartLake as a unique platform as there are some differences
between it and Icelake.

Signed-off-by: Bob Paauwe <bob.j.paauwe@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190322175847.25707-2-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -2323,6 +2323,7 @@ static inline unsigned int i915_sg_segment_size(void)
 #define IS_COFFEELAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_COFFEELAKE)
 #define IS_CANNONLAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_CANNONLAKE)
 #define IS_ICELAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_ICELAKE)
+#define IS_ELKHARTLAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_ELKHARTLAKE)
 #define IS_MOBILE(dev_priv)	(INTEL_INFO(dev_priv)->is_mobile)
 #define IS_HSW_EARLY_SDV(dev_priv) (IS_HASWELL(dev_priv) && \
 				    (INTEL_DEVID(dev_priv) & 0xFF00) == 0x0C00)

drivers/gpu/drm/i915/i915_pci.c

@@ -732,7 +732,7 @@ static const struct intel_device_info intel_icelake_11_info = {
 
 static const struct intel_device_info intel_elkhartlake_info = {
 	GEN11_FEATURES,
-	PLATFORM(INTEL_ICELAKE),
+	PLATFORM(INTEL_ELKHARTLAKE),
 	.is_alpha_support = 1,
 	.engine_mask = BIT(RCS0) | BIT(BCS0) | BIT(VCS0),
 	.ppgtt_size = 36,

drivers/gpu/drm/i915/intel_device_info.c

@@ -57,6 +57,7 @@ static const char * const platform_names[] = {
 	PLATFORM_NAME(COFFEELAKE),
 	PLATFORM_NAME(CANNONLAKE),
 	PLATFORM_NAME(ICELAKE),
+	PLATFORM_NAME(ELKHARTLAKE),
 };
 #undef PLATFORM_NAME
 

drivers/gpu/drm/i915/intel_device_info.h

@@ -73,6 +73,7 @@ enum intel_platform {
 	INTEL_CANNONLAKE,
 	/* gen11 */
 	INTEL_ICELAKE,
+	INTEL_ELKHARTLAKE,
 	INTEL_MAX_PLATFORMS
 };