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drm/i915/cnl: WaDisableI2mCycleOnWRPort

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On CNL B0 stepping GAM is not able to detect some deadlock
condition and then rise the rise the gam_coh_flush.

WA database and spec both mentions to set 4AB8[24]=1 as
workaround. Although register offset 0x4AB8 is not
documented for any platform.

References: HSD#1945815, BSID#1112

Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170829230751.21047-1-rodrigo.vivi@intel.com
This commit is contained in:
Rodrigo Vivi 2017-08-29 16:07:51 -07:00
parent 392572feb0
commit 86ebb015fa
2 changed files with 6 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
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@ -2373,6 +2373,7 @@ enum i915_power_well_id {
#define GAMT_CHKN_BIT_REG _MMIO(0x4ab8)
#define GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING (1<<28)
#define GAMT_CHKN_DISABLE_I2M_CYCLE_ON_WR_PORT (1<<24)
#if 0
#define PRB0_TAIL _MMIO(0x2030)

5
drivers/gpu/drm/i915/intel_engine_cs.c
View File

@ -1070,6 +1070,11 @@ static int cnl_init_workarounds(struct intel_engine_cs *engine)
struct drm_i915_private *dev_priv = engine->i915;
int ret;
/* WaDisableI2mCycleOnWRPort: cnl (pre-prod) */
if (IS_CNL_REVID(dev_priv, CNL_REVID_B0, CNL_REVID_B0))
WA_SET_BIT(GAMT_CHKN_BIT_REG,
GAMT_CHKN_DISABLE_I2M_CYCLE_ON_WR_PORT);
/* WaForceContextSaveRestoreNonCoherent:cnl */
WA_SET_BIT_MASKED(CNL_HDC_CHICKEN0,
HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT);