drm/i915: protect backlight registers and data with a spinlock

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Backlight data and registers are fiddled through LVDS/eDP modeset
enable/disable hooks, backlight sysfs files, asle interrupts, and register
save/restore. Protect the backlight related registers and driver private
fields using a spinlock.

The locking in register save/restore covers a little more than is strictly
necessary, including non-modeset case, for simplicity.

v2: Cover register access, save/restore, i915_read_blc_pwm_ctl() and code
    paths leading there.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Jani Nikula 2013-04-12 15:18:37 +03:00 • committed by Daniel Vetter

parent d654063273

commit 8ba2d18520

4 changed files with 41 additions and 1 deletions

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1

drivers/gpu/drm/i915/i915_dma.c

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1

drivers/gpu/drm/i915/i915_drv.h

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10

drivers/gpu/drm/i915/i915_suspend.c

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30

drivers/gpu/drm/i915/intel_panel.c

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