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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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2
drivers/gpu/drm/drm_sysfs.c
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@@ -159,7 +159,7 @@ static ssize_t status_show(struct device *device,
struct drm_connector *connector = to_drm_connector(device);
enum drm_connector_status status;
status = connector->funcs->detect(connector);
status = connector->funcs->detect(connector, true);
return snprintf(buf, PAGE_SIZE, "%s\n",
drm_get_connector_status_name(status));
}