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drm/i915: fix suspend/resume breakage in lid notifier

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We now unconditionally restore the mode at lid open time since some
platforms turn off the panel, pipes or other display elements when the
lid is closed.  There's a problem with doing this at resume time
however.

At resume time, we'll get a lid event, but restoring the mode at that
time may not be safe (e.g. if we get the lid event before global state
has been restored), so check the suspended state and make sure our
restore is locked against other mode updates.

Tested-by: Ben Gamari <bgamari.foss@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Jesse Barnes
2009-09-14 10:58:48 -07:00
parent ba1234d17b
commit 06891e27a9
3 changed files with 9 additions and 1 deletions
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5
drivers/gpu/drm/i915/intel_lvds.c
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@@ -651,8 +651,11 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
container_of(nb, struct drm_i915_private, lid_notifier);
struct drm_device *dev = dev_priv->dev;
if (acpi_lid_open())
if (acpi_lid_open() && !dev_priv->suspended) {
mutex_lock(&dev->mode_config.mutex);
drm_helper_resume_force_mode(dev);
mutex_unlock(&dev->mode_config.mutex);
}
drm_sysfs_hotplug_event(dev_priv->dev);