[Intel-gfx] [PATCH] drm/i915/mtl: Add Wa_14017856879

[Gustavo Sousa]

Quoting Haridhar Kalvala (2023-04-04 14:32:20)
> Wa_14017856879 implementation for mtl.
> 
> Bspec: 46046
> 
> Signed-off-by: Haridhar Kalvala <haridhar.kalvala at intel.com>

Reviewed-by: Gustavo Sousa <gustavo.sousa at intel.com>

> ---
>  drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 2 ++
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 5 +++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> index 35a4cfac2d20..492b3de6678d 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> @@ -1177,7 +1177,9 @@
>  #define   THREAD_EX_ARB_MODE_RR_AFTER_DEP      REG_FIELD_PREP(THREAD_EX_ARB_MODE, 0x2)
>  
>  #define HSW_ROW_CHICKEN3                       _MMIO(0xe49c)
> +#define GEN9_ROW_CHICKEN3                      MCR_REG(0xe49c)
>  #define   HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE   (1 << 6)
> +#define   MTL_DISABLE_FIX_FOR_EOT_FLUSH                REG_BIT(9)
>  
>  #define GEN8_ROW_CHICKEN                       MCR_REG(0xe4f0)
>  #define   FLOW_CONTROL_ENABLE                  REG_BIT(15)
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 1c8e0e91a2fe..6ea453ddd011 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -2971,6 +2971,11 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
>  
>         add_render_compute_tuning_settings(i915, wal);
>  
> +       if (IS_MTL_GRAPHICS_STEP(i915, M, STEP_B0, STEP_FOREVER) ||
> +           IS_MTL_GRAPHICS_STEP(i915, P, STEP_B0, STEP_FOREVER))
> +               /* Wa_14017856879 */
> +               wa_mcr_masked_en(wal, GEN9_ROW_CHICKEN3, MTL_DISABLE_FIX_FOR_EOT_FLUSH);
> +
>         if (IS_MTL_GRAPHICS_STEP(i915, M, STEP_A0, STEP_B0) ||
>             IS_MTL_GRAPHICS_STEP(i915, P, STEP_A0, STEP_B0))
>                 /*
> -- 
> 2.25.1
>