[Intel-gfx] [PATCH 1/2] drm/i915: Remove the MI_FLUSH_ENABLE setting.

[Ben Widawsky]

-------- Original message --------
Subject: Re: [Intel-gfx] [PATCH 1/2] drm/i915: Remove the MI_FLUSH_ENABLE setting. 
From: Eric Anholt <eric at anholt.net> 
To: Ben Widawsky <ben at bwidawsk.net> 
CC: Keith Packard <keithp at keithp.com>,intel-gfx at lists.freedesktop.org 

On Fri, 20 Jan 2012 14:57:44 -0800, Ben Widawsky <ben at bwidawsk.net> wrote:
> On 01/20/2012 11:16 AM, Eric Anholt wrote:
> > On Thu, 19 Jan 2012 10:59:57 -0800, Ben Widawsky <ben at bwidawsk.net> wrote:
> >> On 01/19/2012 10:54 AM, Keith Packard wrote:
> >>> On Thu, 19 Jan 2012 10:50:05 -0800, Eric Anholt <eric at anholt.net> wrote:
> >>>
> >>>> -	 if (IS_GEN6(dev) || IS_GEN7(dev))
> >>>> -	 mode |= MI_FLUSH_ENABLE << 16 | MI_FLUSH_ENABLE;
> >>>
> >>> This seems better than setting random bits that don't do anything but
> >>> annoy the simulator.
> >>
> >> The simulator complains unless both bits are set iirc. I can double
> >> check, but it's been a while since I've run without my patch.
> > 
> > Can you please cite the message you're getting?  I've read a lot of the
> > simulator at this point, particularly pieces relating to flushing, and I
> > can't find what you're talking about.
> > 
> 
> It is not email friendly paste.
> 
> Gen7GT/Render/src/CsMiCommonCatcher.cpp +293
> 
> It links to a power point which shows the workaround is to set both
> bits. The powerpoint is kind enough to crash libreoffice for me.

That block is checking exactly one bit, bit 12, in my tree.

Please read the powerpoint 
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