[Intel-gfx] [PATCH 2/2] drm/i915: Document the multi-threaded FORCEWAKE bits

[Daniel Vetter]

On Wed, Oct 17, 2012 at 10:05:15AM -0700, Jesse Barnes wrote:
> On Wed, 17 Oct 2012 09:27:24 -0700
> Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> 
> > On Wed, 17 Oct 2012 12:09:55 +0100
> > Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > 
> > > No functional change, but reserves 0x2 for use by userspace.
> > > 
> > > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > > ---
> > >  drivers/gpu/drm/i915/i915_reg.h |    2 ++
> > >  drivers/gpu/drm/i915/intel_pm.c |   10 +++++-----
> > >  2 files changed, 7 insertions(+), 5 deletions(-)
> > 
> > Each of the bits in this reg correspond to a specific agent that may
> > need to wake the GT.  Unfortunately I don't have docs about which bits
> > are used by which agents.  IIRC the BIOS uses one as does the AMT
> > engine if present.
> > 
> > I'll try to find out who owns each and maybe we can reserve our own for
> > userspace.
> 
> Ok we're in the clear here.  I was afraid there might be other system
> components that would do sneaky things behind our back.  But once the
> driver loads, we own the GT, so we can make these bits whatever we want.

I guess that counts for an ack - patch merged to dinq.

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch