drm/i915/tgl: Implement WA_16011163337

Set GS Timer to 224. Combine with Wa_1604555607 due to register FF_MODE2
not being able to be read.

V2: Math issue fixed

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Caz Yokoyama <caz.yokoyama@intel.com>
Cc: Matt Atwood <matthew.s.atwood@intel.com>
Signed-off-by: Clint Taylor <clinton.a.taylor@intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200603221150.14745-1-clinton.a.taylor@intel.com

Author: cataylox

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

@@ -609,11 +609,14 @@ static void tgl_ctx_workarounds_init(struct intel_engine_cs *engine,
 	 * Wa_1604555607:gen12 and Wa_1608008084:gen12
 	 * FF_MODE2 register will return the wrong value when read. The default
 	 * value for this register is zero for all fields and there are no bit
-	 * masks. So instead of doing a RMW we should just write the TDS timer
-	 * value for Wa_1604555607.
+	 * masks. So instead of doing a RMW we should just write the GS Timer
+	 * and TDS timer values for Wa_1604555607 and Wa_16011163337.
 	 */
-	wa_add(wal, FF_MODE2, FF_MODE2_TDS_TIMER_MASK,
-	       FF_MODE2_TDS_TIMER_128, 0);
+	wa_add(wal,
+	       FF_MODE2,
+	       FF_MODE2_GS_TIMER_MASK | FF_MODE2_TDS_TIMER_MASK,
+	       FF_MODE2_GS_TIMER_224  | FF_MODE2_TDS_TIMER_128,
+	       0);
 
 	/* WaDisableGPGPUMidThreadPreemption:tgl */
 	WA_SET_FIELD_MASKED(GEN8_CS_CHICKEN1,

drivers/gpu/drm/i915/i915_reg.h

@@ -8004,6 +8004,8 @@ enum {
 #define   PER_PIXEL_ALPHA_BYPASS_EN		(1 << 7)
 
 #define FF_MODE2			_MMIO(0x6604)
+#define   FF_MODE2_GS_TIMER_MASK	REG_GENMASK(31, 24)
+#define   FF_MODE2_GS_TIMER_224		REG_FIELD_PREP(FF_MODE2_GS_TIMER_MASK, 224)
 #define   FF_MODE2_TDS_TIMER_MASK	REG_GENMASK(23, 16)
 #define   FF_MODE2_TDS_TIMER_128	REG_FIELD_PREP(FF_MODE2_TDS_TIMER_MASK, 4)