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drm/i915/crt: Do not rely upon the HPD presence pin

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Whilst most monitors do wire up the HPD presence pin, it seems quite a
few KVM do not. Therefore if we simply rely on the HPD pin being
asserted to indicate a connected monitor we fail miserable, so fall back
to performing a DCC query for the EDID.

Reported-and-tested-by: Matthieu LAVIE <boiteamadmax@hotmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50501
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-05-31 13:08:53 +01:00 committed by Daniel Vetter
parent c3b2003792
commit 9e612a008f
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/i915/intel_crt.c
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@ -453,13 +453,15 @@ intel_crt_detect(struct drm_connector *connector, bool force)
struct intel_load_detect_pipe tmp; struct intel_load_detect_pipe tmp;
if (I915_HAS_HOTPLUG(dev)) { if (I915_HAS_HOTPLUG(dev)) {
/* We can not rely on the HPD pin always being correctly wired
* up, for example many KVM do not pass it through, and so
* only trust an assertion that the monitor is connected.
*/
if (intel_crt_detect_hotplug(connector)) { if (intel_crt_detect_hotplug(connector)) {
DRM_DEBUG_KMS("CRT detected via hotplug\n"); DRM_DEBUG_KMS("CRT detected via hotplug\n");
return connector_status_connected; return connector_status_connected;
} else { } else
DRM_DEBUG_KMS("CRT not detected via hotplug\n"); DRM_DEBUG_KMS("CRT not detected via hotplug\n");
return connector_status_disconnected;
}
} }
if (intel_crt_detect_ddc(connector)) if (intel_crt_detect_ddc(connector))