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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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6
drivers/gpu/drm/i915/intel_sdvo.c
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@@ -1417,7 +1417,7 @@ intel_analog_is_connected(struct drm_device *dev)
if (!analog_connector)
return false;
if (analog_connector->funcs->detect(analog_connector) ==
if (analog_connector->funcs->detect(analog_connector, true) ==
connector_status_disconnected)
return false;
@@ -1486,7 +1486,9 @@ intel_sdvo_hdmi_sink_detect(struct drm_connector *connector)
return status;
}
static enum drm_connector_status intel_sdvo_detect(struct drm_connector *connector)
static enum drm_connector_status
intel_sdvo_detect(struct drm_connector *connector,
bool nondestructive)
{
uint16_t response;
struct drm_encoder *encoder = intel_attached_encoder(connector);