[Intel-gfx] [PATCH] drm/i915: Reset GMBUS controller after NAK
steve at snewbury.org.uk
Thu Mar 31 08:16:27 PDT 2011
----- Original message -----
> On Wed, 30 Mar 2011 17:07:11 +0100
> Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > Once a NAK has been asserted by the slave, we need to reset the GMBUS
> > controller in order to continue. This is done by asserting the Software
> > Clear Interrupt bit and then clearing it again to restore operations.
> > If we don't clear the NAK, then all future GMBUS xfers will fail,
> > including DDC probes and EDID retrieval.
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35781
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > ---
> This one fixes the issue I was seeing on my HP test machine; LVDS DDC
> probing seems to work ok once this fix is applied.
Could this be related to my inability to successfully probe the ch7036 with the ChromeOS Chrontel driver? Is it worth me testing it again with this patch applied? (I'm currently waiting to hear back from Zotac, my board supplier)
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