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i915: fix intel graphics suspend breakage due to resume/lid event confusion

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In commit c1c7af6089 ("drm/i915: force
mode set at lid open time") the intel graphics driver was taught to
restore the LVDS mode on lid open.

That caused problems with interaction with the suspend/resume code,
which commonly runs at the same time (suspend is often caused by the lid
close event, while lid open is commonly a resume event), which was
worked around with in commit 06891e27a9
("drm/i915: fix suspend/resume breakage in lid notifier").

However, in the meantime the lid event code had also grown a user event
notifier (commit 06324194ee: "drm/i915:
generate a KMS uevent at lid open/close time"), and now _that_ causes
problems with suspend/resume and some versions of Xorg reacting to those
uevents by setting the mode.

So this effectively reverts that commit 06324194ee, and makes the lid
open protection logic against suspend/resume more explicit.  This fixes
at least one laptop. See

	http://bugzilla.kernel.org/show_bug.cgi?id=14484

for more details.

Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
Cc: Eric Anholt <eric@anholt.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2009-11-02 09:29:55 -08:00
parent b6727b12dd
commit c9354c85c1
3 changed files with 24 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/i915/i915_drv.c
View File

@ -89,7 +89,8 @@ static int i915_suspend(struct drm_device *dev, pm_message_t state)
pci_set_power_state(dev->pdev, PCI_D3hot);
}
dev_priv->suspended = 1;
/* Modeset on resume, not lid events */
dev_priv->modeset_on_lid = 0;
return 0;
}
@ -124,7 +125,7 @@ static int i915_resume(struct drm_device *dev)
drm_helper_resume_force_mode(dev);
}
dev_priv->suspended = 0;
dev_priv->modeset_on_lid = 0;
return ret;
}

2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -274,7 +274,7 @@ typedef struct drm_i915_private {
struct drm_i915_display_funcs display;
/* Register state */
bool suspended;
bool modeset_on_lid;
u8 saveLBB;
u32 saveDSPACNTR;
u32 saveDSPBCNTR;

25
drivers/gpu/drm/i915/intel_lvds.c
View File

@ -656,6 +656,15 @@ static int intel_lvds_get_modes(struct drm_connector *connector)
return 0;
}
/*
* Lid events. Note the use of 'modeset_on_lid':
* - we set it on lid close, and reset it on open
* - we use it as a "only once" bit (ie we ignore
* duplicate events where it was already properly
* set/reset)
* - the suspend/resume paths will also set it to
* zero, since they restore the mode ("lid open").
*/
static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
void *unused)
{
@ -663,13 +672,19 @@ 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() && !dev_priv->suspended) {
mutex_lock(&dev->mode_config.mutex);
drm_helper_resume_force_mode(dev);
mutex_unlock(&dev->mode_config.mutex);
if (!acpi_lid_open()) {
dev_priv->modeset_on_lid = 1;
return NOTIFY_OK;
}
drm_sysfs_hotplug_event(dev_priv->dev);
if (!dev_priv->modeset_on_lid)
return NOTIFY_OK;
dev_priv->modeset_on_lid = 0;
mutex_lock(&dev->mode_config.mutex);
drm_helper_resume_force_mode(dev);
mutex_unlock(&dev->mode_config.mutex);
return NOTIFY_OK;
}