drm/i915/cnl: Introduce Cannonlake platform defition.

Cannonlake is a Intel® Processor containing Intel® HD Graphics
following Kabylake.

It is Gen10.

Let's start by adding the platform definition based on previous
platforms but yet as alpha_support.

On following patches we will start adding PCI IDs and the
platform specific changes.

CNL has an increased DDB size as Damien had previously
noticed and provided a separated patch that got squashed here.

v2: Squash DDB size here per Ander request.

Credits-to: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1496781040-20888-1-git-send-email-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -825,6 +825,7 @@ enum intel_platform {
 	INTEL_BROXTON,
 	INTEL_KABYLAKE,
 	INTEL_GEMINILAKE,
+	INTEL_CANNONLAKE,
 	INTEL_MAX_PLATFORMS
 };
 
@@ -2767,6 +2768,7 @@ intel_info(const struct drm_i915_private *dev_priv)
 #define IS_BROXTON(dev_priv)	((dev_priv)->info.platform == INTEL_BROXTON)
 #define IS_KABYLAKE(dev_priv)	((dev_priv)->info.platform == INTEL_KABYLAKE)
 #define IS_GEMINILAKE(dev_priv)	((dev_priv)->info.platform == INTEL_GEMINILAKE)
+#define IS_CANNONLAKE(dev_priv)	((dev_priv)->info.platform == INTEL_CANNONLAKE)
 #define IS_MOBILE(dev_priv)	((dev_priv)->info.is_mobile)
 #define IS_HSW_EARLY_SDV(dev_priv) (IS_HASWELL(dev_priv) && \
 				    (INTEL_DEVID(dev_priv) & 0xFF00) == 0x0C00)
@@ -2858,6 +2860,7 @@ intel_info(const struct drm_i915_private *dev_priv)
 #define IS_GEN7(dev_priv)	(!!((dev_priv)->info.gen_mask & BIT(6)))
 #define IS_GEN8(dev_priv)	(!!((dev_priv)->info.gen_mask & BIT(7)))
 #define IS_GEN9(dev_priv)	(!!((dev_priv)->info.gen_mask & BIT(8)))
+#define IS_GEN10(dev_priv)	(!!((dev_priv)->info.gen_mask & BIT(9)))
 
 #define IS_LP(dev_priv)	(INTEL_INFO(dev_priv)->is_lp)
 #define IS_GEN9_LP(dev_priv)	(IS_GEN9(dev_priv) && IS_LP(dev_priv))

drivers/gpu/drm/i915/i915_pci.c

@@ -425,6 +425,14 @@ static const struct intel_device_info intel_kabylake_gt3_info = {
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
 };
 
+static const struct intel_device_info intel_cannonlake_info = {
+	BDW_FEATURES,
+	.is_alpha_support = 1,
+	.platform = INTEL_CANNONLAKE,
+	.gen = 10,
+	.ddb_size = 1024,
+};
+
 /*
  * Make sure any device matches here are from most specific to most
  * general.  For example, since the Quanta match is based on the subsystem

drivers/gpu/drm/i915/intel_device_info.c

@@ -51,6 +51,7 @@ static const char * const platform_names[] = {
 	PLATFORM_NAME(BROXTON),
 	PLATFORM_NAME(KABYLAKE),
 	PLATFORM_NAME(GEMINILAKE),
+	PLATFORM_NAME(CANNONLAKE),
 };
 #undef PLATFORM_NAME