[Intel-gfx] [PATCH] drm/i915/bdw: Implement WaForceContextSaveRestoreNonCoherent

[Jani Nikula]

On Tue, 27 Jan 2015, Damien Lespiau <damien.lespiau at intel.com> wrote:

Missing commit message. I need some description to decide whether this
is required for fixes/stable or not.

BR,
Jani.


> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h         | 1 +
>  drivers/gpu/drm/i915/intel_ringbuffer.c | 2 ++
>  2 files changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index ae8ea42..47bc4e2 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5253,6 +5253,7 @@ enum punit_power_well {
>  
>  /* GEN8 chicken */
>  #define HDC_CHICKEN0				0x7300
> +#define  HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT	(1<<5)
>  #define  HDC_FORCE_NON_COHERENT			(1<<4)
>  #define  HDC_DONOT_FETCH_MEM_WHEN_MASKED	(1<<11)
>  #define  HDC_FENCE_DEST_SLM_DISABLE		(1<<14)
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 36dad33..d393026 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -790,9 +790,11 @@ static int bdw_init_workarounds(struct intel_engine_cs *ring)
>  	 */
>  	/* WaForceEnableNonCoherent:bdw */
>  	/* WaHdcDisableFetchWhenMasked:bdw */
> +	/* WaForceContextSaveRestoreNonCoherent:bdw */
>  	/* WaDisableFenceDestinationToSLM:bdw (GT3 pre-production) */
>  	WA_SET_BIT_MASKED(HDC_CHICKEN0,
>  			  HDC_FORCE_NON_COHERENT |
> +			  HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT |
>  			  HDC_DONOT_FETCH_MEM_WHEN_MASKED |
>  			  (IS_BDW_GT3(dev) ? HDC_FENCE_DEST_SLM_DISABLE : 0));
>  
> -- 
> 1.8.3.1
>
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-- 
Jani Nikula, Intel Open Source Technology Center