From: Mike Dunn <mikedunn@newsguy.com>
Date: Mon, 7 Jan 2013 21:55:12 +0000 (-0800)
Subject: ALSA: pxa27x: fix ac97 cold reset
X-Git-Tag: v3.2.38~102
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=762a4af818aeee9566231ae627694743ec168380;p=pandora-kernel.git

ALSA: pxa27x: fix ac97 cold reset

commit 41b645c8624df6ace020a8863ad1449d69140f7d upstream.

Cold reset on the pxa27x currently fails and

     pxa2xx_ac97_try_cold_reset: cold reset timeout (GSR=0x44)

appears in the kernel log.  Through trial-and-error (the pxa270 developer's
manual is mostly incoherent on the topic of ac97 reset), I got cold reset to
complete by setting the WARM_RST bit in the GCR register (and later noticed that
pxa3xx does this for cold reset as well).  Also, a timeout loop is needed to
wait for the reset to complete.

Tested on a palm treo 680 machine.

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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