drm/i915: fix opregion backlight chip detect and range

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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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Li Peng 2009-09-15 13:03:36 +08:00 • committed by Jesse Barnes

parent 8dd81a381e

commit 078a033f45

1 changed files with 17 additions and 5 deletions

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drivers/gpu/drm/i915/i915_opregion.c

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