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drm: Use a nondestructive mode for output detect when polling

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Destructive load-detection is very expensive and due to failings
elsewhere can trigger system wide stalls of up to 600ms. A simple
first step to correcting this is not to invoke such an expensive
and destructive load-detection operation automatically.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29536
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16265
Reported-by: Bruno Prémont <bonbons@linux-vserver.org>
Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Chris Wilson
2010-09-09 23:51:02 +01:00
committed by Dave Airlie
parent 27849044ca
commit 7b334fcb45
13 changed files with 56 additions and 27 deletions
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8
drivers/gpu/drm/i915/intel_lvds.c
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@ -445,7 +445,9 @@ static void intel_lvds_mode_set(struct drm_encoder *encoder,
* connected and closed means disconnected. We also send hotplug events as
* needed, using lid status notification from the input layer.
*/
static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
static enum drm_connector_status
intel_lvds_detect(struct drm_connector *connector,
bool nondestructive)
{
struct drm_device *dev = connector->dev;
enum drm_connector_status status = connector_status_connected;
@ -540,7 +542,9 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
* the LID nofication event.
*/
if (connector)
connector->status = connector->funcs->detect(connector);
connector->status = connector->funcs->detect(connector,
true);
/* Don't force modeset on machines where it causes a GPU lockup */
if (dmi_check_system(intel_no_modeset_on_lid))
return NOTIFY_OK;