On Wed, 8 Feb 2012 13:34:13 +0000, Chris Wilson <chris at 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. Tested-by: Eric Anholt <eric at anholt.net> (on top of de67cba65944f26c0f147035bd62e30c5f456b96, this fixes rendering failures and GPU hangs on gen7). -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 197 bytes Desc: not available URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20120221/2e12caae/attachment.pgp>
