drm/i915: Add Wa_14011060649

This is a permanent workaround for TGL,RKL,DG1 and ADLS.
Signed-off-by: Swathi Dhanavanthri <swathi.dhanavanthri@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210324200502.1731265-5-lucas.demarchi@intel.com

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

@@ -1084,11 +1084,37 @@ icl_gt_workarounds_init(struct drm_i915_private *i915, struct i915_wa_list *wal)
 			    L3_CLKGATE_DIS | L3_CR2X_CLKGATE_DIS);
 }
 
+/*
+ * Though there are per-engine instances of these registers,
+ * they retain their value through engine resets and should
+ * only be provided on the GT workaround list rather than
+ * the engine-specific workaround list.
+ */
+static void
+wa_14011060649(struct drm_i915_private *i915, struct i915_wa_list *wal)
+{
+	struct intel_engine_cs *engine;
+	struct intel_gt *gt = &i915->gt;
+	int id;
+
+	for_each_engine(engine, gt, id) {
+		if (engine->class != VIDEO_DECODE_CLASS ||
+		    (engine->instance % 2))
+			continue;
+
+		wa_write_or(wal, VDBOX_CGCTL3F10(engine->mmio_base),
+			    IECPUNIT_CLKGATE_DIS);
+	}
+}
+
 static void
 gen12_gt_workarounds_init(struct drm_i915_private *i915,
 			  struct i915_wa_list *wal)
 {
 	wa_init_mcr(i915, wal);
+
+	/* Wa_14011060649:tgl,rkl,dg1,adls */
+	wa_14011060649(i915, wal);
 }
 
 static void

drivers/gpu/drm/i915/i915_reg.h

@@ -2715,6 +2715,9 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define RING_INDIRECT_CTX_OFFSET(base)	_MMIO((base) + 0x1c8) /* gen8+ */
 #define RING_CTX_TIMESTAMP(base)	_MMIO((base) + 0x3a8) /* gen8+ */
 
+#define VDBOX_CGCTL3F10(base)		_MMIO((base) + 0x3f10)
+#define   IECPUNIT_CLKGATE_DIS		REG_BIT(22)
+
 #define ERROR_GEN6	_MMIO(0x40a0)
 #define GEN7_ERR_INT	_MMIO(0x44040)
 #define   ERR_INT_POISON		(1 << 31)