This is a note to let you know that I've just added the patch titled
drm/i915: disable sdvo hotplug on i945g/gm
to the 3.3-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-disable-sdvo-hotplug-on-i945g-gm.patch
and it can be found in the queue-3.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 768b107e4b3be0acf6f58e914afe4f337c00932b Mon Sep 17 00:00:00 2001
From: Daniel Vetter <[email protected]>
Date: Fri, 4 May 2012 11:29:56 +0200
Subject: drm/i915: disable sdvo hotplug on i945g/gm
MIME-Version: 1.0
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From: Daniel Vetter <[email protected]>
commit 768b107e4b3be0acf6f58e914afe4f337c00932b upstream.
Chris Wilson dug out a hw erratum saying that there's noise on the
interrupt line on i945G chips. We also have a bug report from a i945GM
chip with an sdvo hotplug interrupt storm (and no apparent cause).
Play it safe and disable sdvo hotplug on all i945 variants.
Note that this is a regression that has been introduced in 3.1,
when we've enabled sdvo hotplug support with
commit cc68c81aed7d892deaf12d720d5455208e94cd0a
Author: Simon Farnsworth <[email protected]>
Date: Wed Sep 21 17:13:30 2011 +0100
drm/i915: Enable SDVO hotplug interrupts for HDMI and DVI
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=38442
Reported-and-tested-by: Dominik Köppl <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Signed-Off-by: Daniel Vetter <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/i915/intel_sdvo.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1221,8 +1221,14 @@ static bool intel_sdvo_get_capabilities(
static int intel_sdvo_supports_hotplug(struct intel_sdvo *intel_sdvo)
{
+ struct drm_device *dev = intel_sdvo->base.base.dev;
u8 response[2];
+ /* HW Erratum: SDVO Hotplug is broken on all i945G chips, there's noise
+ * on the line. */
+ if (IS_I945G(dev) || IS_I945GM(dev))
+ return false;
+
return intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_HOT_PLUG_SUPPORT,
&response, 2) && response[0];
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.3/drm-i915-do-no-set-stencil-cache-eviction-lra-w-a-on-gen7.patch
queue-3.3/drm-i915-enable-dip-before-writing-data-on-gen4.patch
queue-3.3/drm-i915-disable-sdvo-hotplug-on-i945g-gm.patch
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