[Intel-gfx] [PATCH] drm/i915/crt: Do not rely upon the HPD presence pin

[Daniel Vetter]

From: Chris Wilson <chris at chris-wilson.co.uk>

VGA hotplug detection "works" by measuring the resistance across
certain pins. A lot of kvm switches fumble this and wire up cheap
resistors with the wrong value or don't bother at all.

To accomodate these, also try to detect a connected monitor by trying
to grab the edid. Contrary to !HAS_HOTPLUG platforms we don't bother
with an actual load-detection cycle when the output is life - that
would be actual work to implement because things moved around. This is
the big difference to Chris Wilson's original approach:

commit 9e612a008fa7fe493a473454def56aa321479495
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu May 31 13:08:53 2012 +0100

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

This blew up on Linus' machine because it errornously detected a vga
screen (without and edid and hence only the default modes), leading to
it's prompt removal:

commit 8f53369b753f5f4c7684c2eb0b592152abb1dd00
Author: Linus Torvalds <torvalds at linux-foundation.org>
Date:   Fri Jun 8 14:53:06 2012 -0700

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

Reported-and-tested-by: Matthieu LAVIE <boiteamadmax at hotmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50501
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_crt.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 75a70c4..7155181 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -453,18 +453,23 @@ 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))
 		return connector_status_connected;
 
+	if (I915_HAS_HOTPLUG(dev))
+		return connector_status_disconnected;
+
 	if (!force)
 		return connector->status;
 
-- 
1.7.10