From: Li Peng <peng.li@linux.intel.com>
Date: Tue, 15 Sep 2009 05:03:36 +0000 (+0800)
Subject: drm/i915: fix opregion backlight chip detect and range
X-Git-Tag: v2.6.32-rc1~52^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=078a033f45471c44befd72ccacf3f31d75299dba;p=pandora-kernel.git

drm/i915: fix opregion backlight chip detect and range

BLC_PWM_CTL2 is for 965+ only, so add device model check for
legacy backlight control.

For native backlight control, it maps the backlight value (0~255)
in opregion ASLE[BCLP] to backlight duty cycle (0~max_backlight)
and set into control register.

It also add support for IGD device, which follows opregion spec.

Signed-off-by: Li Peng <peng.li@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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