[Intel-gfx] [PATCH] drm/i915/skl: Implement WaBarrierPerformanceFixDisable (again)
Ben Widawsky
ben at bwidawsk.net
Wed Jun 3 00:04:45 PDT 2015
On Wed, 03 Jun 2015 09:49:43 +0300
Jani Nikula <jani.nikula at linux.intel.com> wrote:
> On Wed, 03 Jun 2015, Ben Widawsky <benjamin.widawsky at intel.com> wrote:
> > in
> > commit 65ca7514e21adbee25b8175fc909759c735d00ff
> > Author: Damien Lespiau <damien.lespiau at intel.com>
> > Date: Mon Feb 9 19:33:22 2015 +0000
> >
> > drm/i915/skl: Implement WaBarrierPerformanceFixDisable
> >
> > The workaround ended up in the chv workarounds. Not sure what the
> > reason or history of that is, but it /seems/ wrong. Don't know if
> > this fixes anything since I have many other problems with my
> > platform.
> >
> > Cc: Damien Lespiau <damien.lespiau at intel.com>
> > Cc: Nick Hoath <nicholas.hoath at intel.com>
> > Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
>
> Ville beat you to it [1]. However he put it in skl workarounds, not
> gen9, so I'm presuming this does not apply to bxt.
>
> BR,
> Jani.
>
>
Anyone who will talk to us and tells you they know the answer to that
definitively is lying.
My patch is wrong though. Checking only the REVID without checking
IS_SKYLAKE is not the right thing to do.
Consider Ville's patch
Reviewed-by: Ben Widawsky <ben at bwidawsk.net>
(I no longer subscribe to intel-gfx, so actually adding my review is
kind of a pain).
> [1]
> http://mid.gmane.org/1433248657-4509-1-git-send-email-ville.syrjala@linux.intel.com
>
>
> > ---
> > drivers/gpu/drm/i915/intel_ringbuffer.c | 14 +++++++-------
> > 1 file changed, 7 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
> > b/drivers/gpu/drm/i915/intel_ringbuffer.c index d934f85..0fd6033d
> > 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> > +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> > @@ -901,13 +901,6 @@ static int chv_init_workarounds(struct
> > intel_engine_cs *ring) GEN6_WIZ_HASHING_MASK,
> > GEN6_WIZ_HASHING_16x4);
> >
> > - if (INTEL_REVID(dev) == SKL_REVID_C0 ||
> > - INTEL_REVID(dev) == SKL_REVID_D0)
> > - /* WaBarrierPerformanceFixDisable:skl */
> > - WA_SET_BIT_MASKED(HDC_CHICKEN0,
> > - HDC_FENCE_DEST_SLM_DISABLE |
> > - HDC_BARRIER_PERFORMANCE_DISABLE);
> > -
> > return 0;
> > }
> >
> > @@ -972,6 +965,13 @@ static int gen9_init_workarounds(struct
> > intel_engine_cs *ring) tmp |=
> > HDC_FORCE_CSR_NON_COHERENT_OVR_DISABLE;
> > WA_SET_BIT_MASKED(HDC_CHICKEN0, tmp);
> > + if (INTEL_REVID(dev) == SKL_REVID_C0 ||
> > + INTEL_REVID(dev) == SKL_REVID_D0)
> > + /* WaBarrierPerformanceFixDisable:skl */
> > + WA_SET_BIT_MASKED(HDC_CHICKEN0,
> > + HDC_FENCE_DEST_SLM_DISABLE |
> > + HDC_BARRIER_PERFORMANCE_DISABLE);
> > +
> > return 0;
> > }
> >
> > --
> > 2.4.2
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
More information about the Intel-gfx
mailing list