drm/i915/bxt: Add GEN9_CS_DEBUG_MODE1 to HW whitelist

Required for,
WaDisableObjectLevelPreemptionForTrifanOrPolygon:bxt
WaDisableObjectLevelPreemptionForInstancedDraw:bxt
WaDisableObjectLevelPreemtionForInstanceId:bxt

According to WA database these are only applicable for BXT:A0 but since
A0 and A1 shares the same GT these are extended for A1 as well.

These are also required for SKL until B0 but not adding them because they
are pre-production steppings.

This register is added to HW whitelist to support WA required for future
enabling of pre-emptive command execution, WA implementation will be in
userspace and it cannot program this register if it is not on HW whitelist.

v2: use lower case in register defines (Nick)
v3: explain purpose of changes (Chris)

Reviewed-by: Nick Hoath <nicholas.hoath@intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1453412634-29238-5-git-send-email-arun.siluvery@linux.intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ed887cf..c51e7e9 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5998,6 +5998,7 @@ enum skl_disp_power_wells {
 #define FF_SLICE_CS_CHICKEN2                   _MMIO(0x20e4)
 #define  GEN9_TSG_BARRIER_ACK_DISABLE          (1<<8)
 
+#define GEN9_CS_DEBUG_MODE1            _MMIO(0x20ec)
 #define GEN8_CS_CHICKEN1               _MMIO(0x2580)
 
 /* GEN7 chicken */

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 62f535c..a99f834 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1133,6 +1133,15 @@ static int bxt_init_workarounds(struct intel_engine_cs *ring)
                        GEN7_SBE_SS_CACHE_DISPATCH_PORT_SHARING_DISABLE);
        }
 
+       /* WaDisableObjectLevelPreemptionForTrifanOrPolygon:bxt */
+       /* WaDisableObjectLevelPreemptionForInstancedDraw:bxt */
+       /* WaDisableObjectLevelPreemtionForInstanceId:bxt */
+       if (IS_BXT_REVID(dev, 0, BXT_REVID_A1)) {
+               ret = wa_ring_whitelist_reg(ring, GEN9_CS_DEBUG_MODE1);
+               if (ret)
+                       return ret;
+       }
+
        return 0;
 }