[Intel-gfx] [PATCH 1/2] drm/i915/dg2: Introduce Wa_18018764978

[Wayne Boyer]

On 10/25/22 11:03 AM, Matt Atwood wrote:
> Wa_18018764978 applies to specific steppings of DG2 (G11 C0+,
> G11 and G12 A0+).
> 
> Bspec: 66622
> 
> Signed-off-by: Matt Atwood <matthew.s.atwood at intel.com>

With fixups to commit messages as mentioned by Gustavo,
Reviewed-by: Wayne Boyer <wayne.boyer at intel.com>

> ---
>  drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 3 +++
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 5 +++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> index 36d95b79022c..e8372d4cd548 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> @@ -448,6 +448,9 @@
>  #define GEN8_L3CNTLREG				_MMIO(0x7034)
>  #define   GEN8_ERRDETBCTRL			(1 << 9)
>  
> +#define PSS_MODE2				_MMIO(0x703c)
> +#define   SCOREBOARD_STALL_FLUSH_CONTROL	REG_BIT(5)
> +
>  #define GEN7_SC_INSTDONE			_MMIO(0x7100)
>  #define GEN12_SC_INSTDONE_EXTRA			_MMIO(0x7104)
>  #define GEN12_SC_INSTDONE_EXTRA2		_MMIO(0x7108)
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 63e1e6becf34..ced3a26cf7e7 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -743,6 +743,11 @@ static void dg2_ctx_workarounds_init(struct intel_engine_cs *engine,
>  		IS_DG2_G11(engine->i915) || IS_DG2_G12(engine->i915))
>  		wa_masked_field_set(wal, VF_PREEMPTION, PREEMPTION_VERTEX_COUNT, 0x4000);
>  
> +	/* Wa_18018764978:dg2 */
> +	if (IS_DG2_GRAPHICS_STEP(engine->i915, G10, STEP_C0, STEP_FOREVER) ||
> +		IS_DG2_G11(engine->i915) || IS_DG2_G12(engine->i915))
> +		wa_masked_en(wal, PSS_MODE2, SCOREBOARD_STALL_FLUSH_CONTROL);
> +
>  	/* Wa_15010599737:dg2 */
>  	wa_masked_en(wal, CHICKEN_RASTER_1, DIS_SF_ROUND_NEAREST_EVEN);
>  }

-- 
Wayne Boyer
Graphics Software Engineer
AXG SCSS Platform Enablement