Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx> writes:
> Shader feature to prefetch binding tables does not support 16:6 18:8 BTP
> formats. Enabling fault handling could result in hangs with faults.
> Disabling demand prefetch would disable binding table prefetch.
>
> V2: Fix the stepping rivision to B0(Mika)
>
> References: HSDES#1406609255, HSDES#1406573985
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 3 +++
> drivers/gpu/drm/i915/intel_workarounds.c | 6 ++++++
> 2 files changed, 9 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index c8a187d8db0f..fa020425754f 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7413,6 +7413,9 @@ enum {
> #define GEN9_SLICE_COMMON_ECO_CHICKEN1 _MMIO(0x731c)
> #define GEN11_STATE_CACHE_REDIRECT_TO_CS (1 << 11)
>
> +#define GEN7_SARCHKMD _MMIO(0xB000)
> +#define GEN7_DISABLE_DEMAND_PREFETCH (1 << 31)
> +
> #define GEN7_L3SQCREG1 _MMIO(0xB010)
> #define VLV_B0_WA_L3SQCREG1_VALUE 0x00D30000
>
> diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
> index 65cd36cd2957..cf4f4c1f86ab 100644
> --- a/drivers/gpu/drm/i915/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/intel_workarounds.c
> @@ -905,6 +905,12 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
> I915_WRITE(GAMT_CHKN_BIT_REG,
> I915_READ(GAMT_CHKN_BIT_REG) |
> GAMT_CHKN_DISABLE_L3_COH_PIPE);
> +
> + /* Wa_1406609255:icl (pre-prod) */
> + if (IS_ICL_REVID(dev_priv, ICL_REVID_A0, ICL_REVID_B0))
> + I915_WRITE(GEN7_SARCHKMD,
> + I915_READ(GEN7_SARCHKMD) |
> + GEN7_DISABLE_DEMAND_PREFETCH);
> }
>
> void intel_gt_workarounds_apply(struct drm_i915_private *dev_priv)
> --
> 2.9.3
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