On Sat, Feb 02, 2013 at 01:56:08PM +0100, Jesse Barnes 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 2bd074a..5a9e26a 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -511,6 +511,9 @@ 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));
Include a comment with the WA name?
Also this WA seems to be present since SNB. So should the check be for
'gen>=6' instead of VLV? Hmm. It seems that used to be the case actually
and then the WA was removed in commit:
commit 8d79c3490aecfe6e51f0ba6f9780746fb1434954
Author: Eric Anholt <eric at anholt.net>
Date: Thu Jan 19 10:50:05 2012 -0800
drm/i915: Remove the MI_FLUSH_ENABLE setting.
We have always been using the wrong bit -- it's bit 12. However, the
bit also doesn't do anything -- hardware has always accepted the
MI_FLUSH command even when it was specced not to.
Given that there is only one MI_FLUSH emitted in all of the driver
stack on gen6+ (in i965_video.c of the 2d driver, and it should be
using other code to do its flush instead), just remove the MI_FLUSH
enable instead of trying to fix it.
Signed-off-by: Eric Anholt <eric at anholt.net>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Ben Widawsky <ben at bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Looks like the wrong bit part was fixed at some point.
This patch needs to be refreshed anyway since the code was shuffled
around a bit.
> }
>
> if (INTEL_INFO(dev)->gen >= 5) {
> --
> 1.7.9.5
>
> _______________________________________________
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> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrj?l?
Intel OTC
