On Wed, 8 Feb 2012 13:34:13 +0000 Chris Wilson <ch...@chris-wilson.co.uk> wrote:
> This is a revert of 6aa56062eaba67adfb247cded244fd877329588d. > > This was originally introduced to workaround reads of the ringbuffer > registers returning 0 on SandyBridge causing hangs due to ringbuffer > overflow. The root cause here was reads through the GT powerwell require > the forcewake dance, something we only learnt of later. Now it appears > that reading the reported head position from the HWS is returning > garbage, leading once again to hangs. Sorry meant to apply this early last week... on its way to Dave now. Thanks, -- Jesse Barnes, Intel Open Source Technology Center
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