[Intel-gfx] [PATCH 05/12] drm/i915: implement WaGTEnableMiFlush on VLV

[Ben Widawsky]

On Tue,  2 Oct 2012 17:43:39 -0500
Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> We don't generally use MI_FLUSH these days, but this bit may affect
> other flushing logic, so set it to be safe.
> 
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/intel_ringbuffer.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 984a0c5..1718c54 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -512,6 +512,9 @@ static int init_render_ring(struct intel_ring_buffer *ring)
>  			I915_WRITE(GFX_MODE_GEN7,
>  				   _MASKED_BIT_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) |
>  				   _MASKED_BIT_ENABLE(GFX_REPLAY_MODE));
> +		if (IS_VALLEYVIEW(dev))
> +			I915_WRITE(MI_MODE, I915_READ(MI_MODE) |
> +				   _MASKED_BIT_ENABLE(MI_FLUSH_ENABLE));
>  	}
>  
>  	if (INTEL_INFO(dev)->gen >= 5) {


The workaround itself calls for this to be set for snb->hsw. Why not do
them all?

-- 
Ben Widawsky, Intel Open Source Technology Center