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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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4
drivers/gpu/drm/drm_crtc_helper.c
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@@ -103,7 +103,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
if (connector->funcs->force)
connector->funcs->force(connector);
} else {
connector->status = connector->funcs->detect(connector);
connector->status = connector->funcs->detect(connector, false);
drm_kms_helper_poll_enable(dev);
}
@@ -866,7 +866,7 @@ static void output_poll_execute(struct work_struct *work)
!(connector->polled & DRM_CONNECTOR_POLL_HPD))
continue;
status = connector->funcs->detect(connector);
status = connector->funcs->detect(connector, true);
if (old_status != status)
changed = true;
}