@@ -487,6 +487,9 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define GAB_CTL _MMIO(0x24000)
#define GAB_CTL_CONT_AFTER_PAGEFAULT (1 << 8)
+#define GU_CNTL _MMIO(0x101010)
+#define LMEM_INIT REG_BIT(7)
+
#define GEN6_STOLEN_RESERVED _MMIO(0x1082C0)
#define GEN6_STOLEN_RESERVED_ADDR_MASK (0xFFF << 20)
#define GEN7_STOLEN_RESERVED_ADDR_MASK (0x3FFF << 18)
@@ -1917,6 +1917,18 @@ int intel_uncore_init_mmio(struct intel_uncore *uncore)
if (ret)
return ret;
+ /*
+ * The boot firmware initializes local memory and assesses its health.
+ * If memory training fails, the punit will have been instructed to
+ * keep the GT powered down; we won't be able to communicate with it
+ * and we should not continue with driver initialization.
+ */
+ if (IS_DGFX(i915) &&
+ !(__raw_uncore_read32(uncore, GU_CNTL) & LMEM_INIT)) {
+ drm_err(&i915->drm, "LMEM not initialized by firmware\n");
+ return -ENODEV;
+ }
+
if (INTEL_GEN(i915) > 5 && !intel_vgpu_active(i915))
uncore->flags |= UNCORE_HAS_FORCEWAKE;