Re: [PATCH 0/4] Enable FBC on SKL, v3

["Zanoni, Paulo R" <paulo.r.zanoni@intel.com>]

Em Qua, 2016-04-06 às 10:36 +0530, Thulasimani, Sivakumar escreveu:
> dont want to hijack thread but wanted to point out a possible
> regression 
> in the
> previous patches of this series.
> 
> intel_fbc_can_choose: returns true for gen 4/5/6/7. (possible bug)

How? It will check for i915.enable_fbc, which will have been sanitized
to zero on these platforms. Aren't you explicitly enabling FBC on these
platforms by using i915.enable_fbc=1?

> 
> so intel_crtc_state->enable_fbc = true; will be executed for first
> crtc
> everytime intel_fbc_choose_crtc is called. Although there is check to
> handle fbc already enabled, it may fail when we fbc is disabled and
> we are working on non supported panel.
> 
> regards,
> Sivakumar
> 
> On 4/5/2016 2:47 AM, Paulo Zanoni wrote:
> > 
> > Now with the suggestion from Chris instead of the old workaround.
> > We don't need
> > new DDX patches anymore, but now we need new IGT patches.
> > 
> > Chris Wilson (1):
> >    drm/i915: use ORIGIN_CPU for frontbuffer invalidation on WC
> > mmaps
> > 
> > Paulo Zanoni (3):
> >    drm/i915/fbc: update busy_bits even for GTT and flip flushes
> >    drm/i915/fbc: sanitize i915.enable_fbc during FBC init
> >    drm/i915/fbc: enable FBC on gen 9+ too
> > 
> >   drivers/gpu/drm/i915/i915_drv.h  |  1 +
> >   drivers/gpu/drm/i915/i915_gem.c  | 14 +++++++++++---
> >   drivers/gpu/drm/i915/intel_fbc.c | 27 ++++++++++++++++-----------
> >   3 files changed, 28 insertions(+), 14 deletions(-)
> > 
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