linux-kernel - Regression: hang on BYT with new pstate support

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Message-ID: <20131206105656.4c4b1e5e@jbarnes-desktop>
Date:	Fri, 6 Dec 2013 10:56:56 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	linux-kernel@...r.kernel.org,
	Dirk Brandewie <dirk.j.brandewie@...el.com>
Subject: Regression: hang on BYT with new pstate support

The drm-intel tree just updated to 3.13-rc, and I started seeing early
hard hangs on my BYT system.  I bisected it down to this commit:

commit 19e77c28dbf1972305da0dfeb92a62f83df3a91d
Author: Dirk Brandewie <dirk.j.brandewie@...el.com>
Date:   Mon Oct 21 09:20:35 2013 -0700

    intel_pstate: Add Baytrail support
    
    Add support for the Baytrail processor.

The hangs occur at different times, so unless the get/set functions
aren't called until we change the state, the problem may be in the
core_set_pstate function instead?  Maybe it's not suited to BYT somehow?

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center
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