drm/i915: Parameterize PWRCTX_MAXCNT

Rather than having separate definitions for each engine, create a single
parameterized macro that takes the engine base offset.  This will also
ensure we get to the proper offset if we ever need to use these
registers on newer platforms (where the media engine offsets have
changed).

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220111051600.3429104-3-matthew.d.roper@intel.com

drivers/gpu/drm/i915/gt/intel_rc6.c

@@ -442,10 +442,10 @@ static bool bxt_check_bios_rc6_setup(struct intel_rc6 *rc6)
 		enable_rc6 = false;
 	}
 
-	if (!((intel_uncore_read(uncore, PWRCTX_MAXCNT_RCSUNIT) & IDLE_TIME_MASK) > 1 &&
-	      (intel_uncore_read(uncore, PWRCTX_MAXCNT_VCSUNIT0) & IDLE_TIME_MASK) > 1 &&
-	      (intel_uncore_read(uncore, PWRCTX_MAXCNT_BCSUNIT) & IDLE_TIME_MASK) > 1 &&
-	      (intel_uncore_read(uncore, PWRCTX_MAXCNT_VECSUNIT) & IDLE_TIME_MASK) > 1)) {
+	if (!((intel_uncore_read(uncore, PWRCTX_MAXCNT(RENDER_RING_BASE)) & IDLE_TIME_MASK) > 1 &&
+	      (intel_uncore_read(uncore, PWRCTX_MAXCNT(GEN6_BSD_RING_BASE)) & IDLE_TIME_MASK) > 1 &&
+	      (intel_uncore_read(uncore, PWRCTX_MAXCNT(BLT_RING_BASE)) & IDLE_TIME_MASK) > 1 &&
+	      (intel_uncore_read(uncore, PWRCTX_MAXCNT(VEBOX_RING_BASE)) & IDLE_TIME_MASK) > 1)) {
 		drm_dbg(&i915->drm,
 			"Engine Idle wait time not set properly.\n");
 		enable_rc6 = false;

drivers/gpu/drm/i915/i915_reg.h

@@ -8954,11 +8954,7 @@ enum {
 #define	   RC6_CTX_IN_DRAM			(1 << 0)
 #define  RC6_CTX_BASE				_MMIO(0xD48)
 #define    RC6_CTX_BASE_MASK			0xFFFFFFF0
-#define  PWRCTX_MAXCNT_RCSUNIT			_MMIO(0x2054)
-#define  PWRCTX_MAXCNT_VCSUNIT0			_MMIO(0x12054)
-#define  PWRCTX_MAXCNT_BCSUNIT			_MMIO(0x22054)
-#define  PWRCTX_MAXCNT_VECSUNIT			_MMIO(0x1A054)
-#define  PWRCTX_MAXCNT_VCSUNIT1			_MMIO(0x1C054)
+#define  PWRCTX_MAXCNT(base)			_MMIO((base) + 0x54)
 #define    IDLE_TIME_MASK			0xFFFFF
 #define  FORCEWAKE				_MMIO(0xA18C)
 #define  FORCEWAKE_VLV				_MMIO(0x1300b0)