[Intel-gfx] [PATCH 7/7] drm/i915/icl: Add Wa_1406609255

[Anuj Phogat]

On Fri, Sep 28, 2018 at 9:50 AM Radhakrishna Sripada
<radhakrishna.sripada at intel.com> wrote:
>
> 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.
>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> ---
>  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 4b472bc2d26d..117ae5bf647c 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7411,6 +7411,9 @@ 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 54a63c9b694f..9d5f48b98803 100644
> --- a/drivers/gpu/drm/i915/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/intel_workarounds.c
> @@ -909,6 +909,12 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
>         /* WaEnable32PlaneMode:icl */
>         I915_WRITE(GEN9_CSFE_CHICKEN1_RCS,
>                    _MASKED_BIT_ENABLE(GEN11_ENABLE_32_PLANE_MODE));
> +
> +       /* Wa_1406609255:icl (pre-prod) */
> +       if (IS_ICL_REVID(dev_priv, ICL_REVID_A0, ICL_REVID_C0))
> +               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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Tested and Reviewed-by: Anuj Phogat <anuj.phogat at gmail.com>