From 9e612a008fa7fe493a473454def56aa321479495 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 31 May 2012 13:08:53 +0100
Subject: [PATCH] drm/i915/crt: Do not rely upon the HPD presence pin
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>
---
drivers/gpu/drm/i915/intel_crt.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 75a70c46ef1b..844e93e1e395 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -453,13 +453,15 @@ intel_crt_detect(struct drm_connector *connector, bool force)
struct intel_load_detect_pipe tmp;
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)) {
DRM_DEBUG_KMS("CRT detected via hotplug\n");
return connector_status_connected;
- } else {
+ } else
DRM_DEBUG_KMS("CRT not detected via hotplug\n");
- return connector_status_disconnected;
- }
}
if (intel_crt_detect_ddc(connector))
--
2.20.1