[PATCH 04/12] drm/i915: Document which RING_FAULT bits apply to which platforms

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

The RING_FAULT bits have change a bit over the years. Document
which platforms use which bits.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_regs.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 764424d48a25..1d318993a652 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -326,10 +326,10 @@
 							    _RING_FAULT_REG_VCS, \
 							    _RING_FAULT_REG_VECS, \
 							    _RING_FAULT_REG_BCS))
-#define   RING_FAULT_ENGINE_ID_MASK		REG_GENMASK(16, 12)
-#define   RING_FAULT_GTTSEL_MASK		REG_BIT(11)
+#define   RING_FAULT_ENGINE_ID_MASK		REG_GENMASK(16, 12) /* bdw+ */
+#define   RING_FAULT_GTTSEL_MASK		REG_BIT(11) /* pre-bdw */
 #define   RING_FAULT_SRCID_MASK			REG_GENMASK(10, 3)
-#define   RING_FAULT_FAULT_TYPE_MASK		REG_GENMASK(2, 1)
+#define   RING_FAULT_FAULT_TYPE_MASK		REG_GENMASK(2, 1) /* ivb+ */
 #define   RING_FAULT_VALID			REG_BIT(0)
 
 #define ERROR_GEN6				_MMIO(0x40a0)
-- 
2.45.3