From: Jani Nikula <jani.nikula@intel.com>
Date: Fri, 4 Jul 2014 02:00:37 +0000 (+0800)
Subject: drm/i915: provide interface for audio driver to query cdclk
X-Git-Tag: omap-for-v3.16/fixes-rc4~18^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c149dcb5c60bfea8871f16dfcc0690255eeb825f;p=pandora-kernel.git

drm/i915: provide interface for audio driver to query cdclk

For Haswell and Broadwell, if the display power well has been disabled,
the display audio controller divider values EM4 M VALUE and EM5 N VALUE
will have been lost. The CDCLK frequency is required for reprogramming them
to generate 24MHz HD-A link BCLK. So provide a private interface for the
audio driver to query CDCLK.

This is a stopgap solution until a more generic interface between audio
and display drivers has been implemented.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

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