Re: [PATCH] drm/i915: Flush writes to GMBUS registers

From: Chris Wilson
Date: Mon Mar 18 2013 - 08:49:17 EST

On Mon, Mar 18, 2013 at 12:51:45PM +0100, Jiri Kosina wrote:
> On Mon, 18 Mar 2013, Chris Wilson wrote:
> > If we do not complete the writes to the GMBUS registers, they remain
> > active for an indefinite period of time afterwards, even causing
> > spurious interrupts on gm45.
> >
> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > Link:
> > Cc: Shawn Starr <shawn.starr@xxxxxxxxxx>
> > Cc: Jiri Kosina <jkosina@xxxxxxx>
> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Unfortunately I can't provide my Tested-by or Acked-by for this, as I am
> still seeing the "nobody cared" for irq 16 with this patch applied.

The message reappeared on the third reboot. Perhaps an indicator that it
is a timing issue. I guess the sensible approach then is to exclude gen4
from the whitelist for gmbus irqs.

Chris Wilson, Intel Open Source Technology Centre
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