linux-kernel - Re: [Intel-gfx] Linux 3.16-rc2

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Date:	Mon, 7 Jul 2014 17:04:02 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Thomas Meyer <thomas@...3r.de>, jikos@...e.cz,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [Intel-gfx] Linux 3.16-rc2

On Mon, Jul 07, 2014 at 05:16:13PM +0200, Daniel Vetter wrote:
> On Wed, Jul 02, 2014 at 06:18:41PM +0200, Thomas Meyer wrote:
> > Hi,
> > 
> > this patch on top of v3.16-rc3-62-gd92a333 makes the resume from ram
> > regression go away on my machine:
> 
> Hm, we could conditionalize this hack on IS_G4X ... Chris, thoughts?

As different machines favour different w/a, I think the issue is mostly
timing related. It could be sequence of register writes, but we tried
different orders early on. The next experiment I guess would be to
insert small delays between each write to see if that helps. Or to write
each register twice.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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