This is a note to let you know that I've just added the patch titled
drm/i915: Fake HDMI live status
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-fake-hdmi-live-status.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 60b3143c7cac7e8d2ca65c0b347466c5776395d1 Mon Sep 17 00:00:00 2001
From: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Date: Thu, 21 Apr 2016 16:48:32 +0530
Subject: drm/i915: Fake HDMI live status
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From: Shashank Sharma <shashank.sharma@xxxxxxxxx>
commit 60b3143c7cac7e8d2ca65c0b347466c5776395d1 upstream.
This patch does the following:
- Fakes live status of HDMI as connected (even if that's not).
While testing certain (monitor + cable) combinations with
various intel platforms, it seems that live status register
doesn't work reliably on some older devices. So limit the
live_status check for HDMI detection, only for platforms
from gen7 onwards.
V2: restrict faking live_status to certain platforms
V3: (Ville)
- keep the debug message for !live_status case
- fix indentation of comment
- remove "warning" from the debug message
(Jani)
- Change format of fix details in the commit message
Fixes: 237ed86c693d ("drm/i915: Check live status before reading edid")
Suggested-by: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/1461237606-16491-1-git-send-email-shashank.sharma@xxxxxxxxx
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
(cherry picked from commit 4f4a8185011773f7520d9916c6857db946e7f9d1)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1388,8 +1388,16 @@ intel_hdmi_detect(struct drm_connector *
hdmi_to_dig_port(intel_hdmi));
}
- if (!live_status)
- DRM_DEBUG_KMS("Live status not up!");
+ if (!live_status) {
+ DRM_DEBUG_KMS("HDMI live status down\n");
+ /*
+ * Live status register is not reliable on all intel platforms.
+ * So consider live_status only for certain platforms, for
+ * others, read EDID to determine presence of sink.
+ */
+ if (INTEL_INFO(dev_priv)->gen < 7 || IS_IVYBRIDGE(dev_priv))
+ live_status = true;
+ }
intel_hdmi_unset_edid(connector);
Patches currently in stable-queue which might be from shashank.sharma@xxxxxxxxx are
queue-4.4/drm-i915-fake-hdmi-live-status.patch
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