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authorDaniel Vetter <daniel.vetter@ffwll.ch>2012-05-04 11:29:56 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-12 09:32:04 -0700
commitfc737b6c5fb5e3d9f5562c1db8c8a73af2304cd4 (patch)
parent381c2fc9d4012983065c39f0fc50cac9ec32b0be (diff)
drm/i915: disable sdvo hotplug on i945g/gm
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 <simon.farnsworth@onelan.co.uk> 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 <dominik@devwork.org> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 0a877dd47475..8eddccaf1f10 100644
--- 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(struct intel_sdvo *intel_sdvo, struct in
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];