drm/i915/kbl: Add WaDisableDynamicCreditSharing

Bspec states that we need to turn off dynamic credit
sharing on kbl revid a0 and b0. This happens by writing bit 28
on 0x4ab8.

References: HSD#2225601, HSD#2226938, HSD#2225763
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-15-git-send-email-mika.kuoppala@intel.com
(cherry picked from commit c0b730d572ea00d427f6112b17982c6b9d5e97bb)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3e16b9dadd92..b7cfb38c3fb8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1672,6 +1672,9 @@ enum skl_disp_power_wells {
 
 #define GEN7_TLB_RD_ADDR        _MMIO(0x4700)
 
+#define GAMT_CHKN_BIT_REG       _MMIO(0x4ab8)
+#define   GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING      (1<<28)
+
 #if 0
 #define PRB0_TAIL       _MMIO(0x2030)
 #define PRB0_HEAD       _MMIO(0x2034)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 421e03d99c28..8106a700681a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1202,6 +1202,11 @@ static int kbl_init_workarounds(struct intel_engine_cs *engine)
         I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
                                    GEN9_GAPS_TSV_CREDIT_DISABLE));
 
+        /* WaDisableDynamicCreditSharing:kbl */
+        if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0))
+                WA_SET_BIT(GAMT_CHKN_BIT_REG,
+                           GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING);
+
         /* WaDisableFenceDestinationToSLM:kbl (pre-prod) */
         if (IS_KBL_REVID(dev_priv, KBL_REVID_A0, KBL_REVID_A0))
                 WA_SET_BIT_MASKED(HDC_CHICKEN0,