drm/xe: Fix duplicated setting for register 0x6604

The following warning shows up for TGL:

		[drm:xe_reg_sr_add [xe]] *ERROR* Discarding save-restore reg 6604 (clear: 00ff0000, set: 00040000, masked: no): ret=-22
		[drm:xe_reg_sr_add [xe]] *ERROR* Discarding save-restore reg 6604 (clear: 00ff0000, set: 00040000, masked: no): ret=-22

That is because the same register is being set both by the WAs and the
tunings. Like was done in i915, prefer the tuning over the workaround
since that is applicable for more platforms. Also fix the tuning: it
was incorrectly using the MCR version of the register, but that only
became true in XEHP.

References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/233Reported-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://lore.kernel.org/r/20230306212450.803557-1-lucas.demarchi@intel.comSigned-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/regs/xe_gt_regs.h

@@ -70,7 +70,6 @@
 #define XEHP_FLAT_CCS_BASE_ADDR			MCR_REG(0x4910)
 
 #define GEN12_FF_MODE2				_MMIO(0x6604)
-#define XEHP_FF_MODE2				MCR_REG(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)

drivers/gpu/drm/xe/xe_tuning.c

@@ -24,11 +24,12 @@ static const struct xe_rtp_entry gt_tunings[] = {
 };
 
 static const struct xe_rtp_entry lrc_tunings[] = {
-	{ XE_RTP_NAME("1604555607"),
-	  XE_RTP_RULES(GRAPHICS_VERSION(1200)),
-	  XE_RTP_ACTIONS(FIELD_SET_NO_READ_MASK(XEHP_FF_MODE2,
-						FF_MODE2_TDS_TIMER_MASK,
-						FF_MODE2_TDS_TIMER_128))
+	{ XE_RTP_NAME("Tuning: ganged timer, also known as 16011163337"),
+	  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1200, 1210)),
+	  /* read verification is ignored due to 1608008084. */
+	  XE_RTP_ACTIONS(FIELD_SET_NO_READ_MASK(GEN12_FF_MODE2,
+						FF_MODE2_GS_TIMER_MASK,
+						FF_MODE2_GS_TIMER_224))
 	},
 	{}
 };

drivers/gpu/drm/xe/xe_wa.c

@@ -265,13 +265,9 @@ static const struct xe_rtp_entry lrc_was[] = {
 				   GEN9_PREEMPT_GPGPU_THREAD_GROUP_LEVEL,
 				   XE_RTP_ACTION_FLAG(MASKED_REG)))
 	},
-	{ XE_RTP_NAME("16011163337"),
-	  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1200, 1210)),
-	  /* read verification is ignored due to 1608008084. */
-	  XE_RTP_ACTIONS(FIELD_SET_NO_READ_MASK(GEN12_FF_MODE2,
-						FF_MODE2_GS_TIMER_MASK,
-						FF_MODE2_GS_TIMER_224))
-	},
+
+	/* DG1 */
+
 	{ XE_RTP_NAME("1409044764"),
 	  XE_RTP_RULES(PLATFORM(DG1)),
 	  XE_RTP_ACTIONS(CLR(GEN11_COMMON_SLICE_CHICKEN3,