drm/i915: Eliminate has_4tile feature flag

We don't really need a feature flag for has_4tile since there's a
well-defined cutover point (DG2) at which all new platforms started
using Tile4 as their Y-major tiling layout.  The GT side of the code
already handles Tile4 vs legacy TileY with checks on the IP version
rather than looking at the feature flag, and we can simplify the display
code similarly (which will also make it more self-contained for re-use
in the Xe driver).
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Haridhar Kalvala <haridhar.kalvala@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230810234618.3738870-4-matthew.d.roper@intel.com

drivers/gpu/drm/i915/display/intel_display_device.h

@@ -32,6 +32,7 @@ struct drm_printer;
 	func(overlay_needs_physical); \
 	func(supports_tv);
 
+#define HAS_4TILE(i915)			(IS_DG2(i915) || DISPLAY_VER(i915) >= 14)
 #define HAS_ASYNC_FLIPS(i915)		(DISPLAY_VER(i915) >= 5)
 #define HAS_CDCLK_CRAWL(i915)		(DISPLAY_INFO(i915)->has_cdclk_crawl)
 #define HAS_CDCLK_SQUASH(i915)		(DISPLAY_INFO(i915)->has_cdclk_squash)

drivers/gpu/drm/i915/i915_drv.h

@@ -733,7 +733,6 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define CMDPARSER_USES_GGTT(i915) (GRAPHICS_VER(i915) == 7)
 
 #define HAS_LLC(i915)	(INTEL_INFO(i915)->has_llc)
-#define HAS_4TILE(i915)	(INTEL_INFO(i915)->has_4tile)
 #define HAS_SNOOP(i915)	(INTEL_INFO(i915)->has_snoop)
 #define HAS_EDRAM(i915)	((i915)->edram_size_mb)
 #define HAS_SECURE_BATCHES(i915) (GRAPHICS_VER(i915) < 6)

drivers/gpu/drm/i915/i915_pci.c

@@ -713,7 +713,6 @@ static const struct intel_device_info adl_p_info = {
 	.has_3d_pipeline = 1, \
 	.has_64bit_reloc = 1, \
 	.has_flat_ccs = 1, \
-	.has_4tile = 1, \
 	.has_global_mocs = 1, \
 	.has_gt_uc = 1, \
 	.has_llc = 1, \

drivers/gpu/drm/i915/intel_device_info.h

@@ -150,7 +150,6 @@ enum intel_ppgtt_type {
 	func(gpu_reset_clobbers_display); \
 	func(has_reset_engine); \
 	func(has_3d_pipeline); \
-	func(has_4tile); \
 	func(has_flat_ccs); \
 	func(has_global_mocs); \
 	func(has_gmd_id); \