[Intel-gfx] Framebuffer compression with 2.6.32-rc

[Jesse Barnes]

On Thu, 15 Oct 2009 12:41:09 +0200
Florian Mickler <florian at mickler.org> wrote:

> On Wed, 14 Oct 2009 15:24:37 -0700
> Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> 
> > 
> > It should be checking the enable bit instead, the compressing bit
> > will be turning on & off a lot.
> > 
> > But we have a register dumper for this, so I don't think we need a
> > debugfs file...
> > 
> 
> On Thu, 15 Oct 2009 07:06:50 +0200
> Tino Keitel <tino.keitel+xorg at tikei.de> wrote:
> > 
> > I already asked, but no reply yet: how do I actually use this
> > register dumper, and how do I see if FBC is enabled?
> > 
> > Regards,
> > Tino
> 
> hm... good question... i get this:
> 
> # ./intel_reg_dumper  | grep FBC
> (II):         FBC_CFB_BASE: 0x7f800000
> (II):          FBC_LL_BASE: 0x7e082000
> (II):          FBC_CONTROL: 0x00000000
> (II):          FBC_COMMAND: 0x00000000
> (II):           FBC_STATUS: 0x20000000
> (II):         FBC_CONTROL2: 0x00000000
> (II):        FBC_FENCE_OFF: 0x00000000
> (II):          FBC_MOD_NUM: 0x00000000
> 
> 
> looking in drivers/gpu/drm/i915/i915_reg.h i only see one enable bit
> regarding fbc and it is in the control register 
> (  #define   FBC_CTL_EN            (1<<31) ) 
> 
> as FBC_CONTROL is 0x0 i'm pretty shure in my case it is off.. ? 
> 
> hth,
> Florian
> 
> p.s. is this in the intel hardware manuals?

Yeah, it's in the manuals.  The high bit of FBC_CONTROL will be set if
it's enabled.

-- 
Jesse Barnes, Intel Open Source Technology Center