Quoting Mika Kuoppala (2019-10-11 14:39:10)
> Add hdc pipeline flush to ensure memory state is coherent
> in L3 when we are done.
> 
> Signed-off-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_gpu_commands.h | 1 +
>  drivers/gpu/drm/i915/gt/intel_lrc.c          | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h 
> b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> index 8c8e6bf824a9..696b6495b0da 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> @@ -232,6 +232,7 @@
>  #define   PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE                (1<<10) /* 
> GM45+ only */
>  #define   PIPE_CONTROL_L3_RO_CACHE_INVALIDATE          (1<<10) /* gen12 */
>  #define   PIPE_CONTROL_INDIRECT_STATE_DISABLE          (1<<9)
> +#define   PIPE_CONTROL_HDC_PIPELINE_FLUSH              (1<<9)  /* gen 12 */

Ack. Just need to tweak usage.
-Chris
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