On Mon, Jan 21, 2013 at 10:25:36PM +0200, Imre Deak wrote: > On Sun, 2013-01-20 at 16:11 +0000, Chris Wilson wrote: > > This is a required workarounds for all products, especially on gen6+ > > where it causes the command streamer to fail to parse instructions > > following a WAIT_FOR_EVENT. We use WAIT_FOR_EVENT for synchronising > > between the GPU and the display engines, and so this bit being unset may > > cause hangs. > > > > References: https://bugzilla.kernel.org/show_bug.cgi?id=52311 > > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk> > > Cc: stable at vger.kernel.org > > Reviewed-by: Imre Deak <imre.deak at intel.com> Picked up for -fixes, thanks for the patch. -Daniel > > > --- > > drivers/gpu/drm/i915/i915_reg.h | 1 + > > drivers/gpu/drm/i915/intel_ringbuffer.c | 19 +++++++++++++------ > > 2 files changed, 14 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > > index 8b81052..db1c034 100644 > > --- a/drivers/gpu/drm/i915/i915_reg.h > > +++ b/drivers/gpu/drm/i915/i915_reg.h > > @@ -536,6 +536,7 @@ > > #define MI_MODE 0x0209c > > # define VS_TIMER_DISPATCH (1 << 6) > > # define MI_FLUSH_ENABLE (1 << 12) > > +# define ASYNC_FLIP_PERF_DISABLE (1 << 14) > > > > #define GEN6_GT_MODE 0x20d0 > > #define GEN6_GT_MODE_HI (1 << 9) > > diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c > > index ef68037..af7adb0 100644 > > --- a/drivers/gpu/drm/i915/intel_ringbuffer.c > > +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c > > @@ -503,13 +503,20 @@ static int init_render_ring(struct intel_ring_buffer *ring) > > struct drm_i915_private *dev_priv = dev->dev_private; > > int ret = init_ring_common(ring); > > > > - if (INTEL_INFO(dev)->gen > 3) { > > + if (INTEL_INFO(dev)->gen > 3) > > I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(VS_TIMER_DISPATCH)); > > - if (IS_GEN7(dev)) > > - I915_WRITE(GFX_MODE_GEN7, > > - _MASKED_BIT_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) | > > - _MASKED_BIT_ENABLE(GFX_REPLAY_MODE)); > > - } > > + > > + /* We need to disable the AsyncFlip performance optimisations in order > > + * to use MI_WAIT_FOR_EVENT within the CS. It should already be > > + * programmed to '1' on all products. > > + */ > > + if (INTEL_INFO(dev)->gen >= 6) > > + I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE)); > > + > > + if (IS_GEN7(dev)) > > + I915_WRITE(GFX_MODE_GEN7, > > + _MASKED_BIT_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) | > > + _MASKED_BIT_ENABLE(GFX_REPLAY_MODE)); > > > > if (INTEL_INFO(dev)->gen >= 5) { > > ret = init_pipe_control(ring); > > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
