drm/i915/mtl: add GSC CS reset support

The GSC CS has its own dedicated bit in the GDRST register.

Bspec: 52549
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221102171047.2787951-5-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/gt/intel_engine_cs.c

@@ -423,6 +423,7 @@ static u32 get_reset_domain(u8 ver, enum intel_engine_id id)
 			[CCS1]  = GEN11_GRDOM_RENDER,
 			[CCS2]  = GEN11_GRDOM_RENDER,
 			[CCS3]  = GEN11_GRDOM_RENDER,
+			[GSC0]  = GEN12_GRDOM_GSC,
 		};
 		GEM_BUG_ON(id >= ARRAY_SIZE(engine_reset_domains) ||
 			   !engine_reset_domains[id]);

drivers/gpu/drm/i915/gt/intel_gt_regs.h

@@ -643,6 +643,7 @@
 #define   XEHPC_GRDOM_BLT3			REG_BIT(26)
 #define   XEHPC_GRDOM_BLT2			REG_BIT(25)
 #define   XEHPC_GRDOM_BLT1			REG_BIT(24)
+#define   GEN12_GRDOM_GSC			REG_BIT(21)
 #define   GEN11_GRDOM_SFC3			REG_BIT(20)
 #define   GEN11_GRDOM_SFC2			REG_BIT(19)
 #define   GEN11_GRDOM_SFC1			REG_BIT(18)