]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
drm/i915: fix the SDE irq dmesg warnings properly
authorJani Nikula <jani.nikula@intel.com>
Wed, 25 Nov 2015 14:47:22 +0000 (16:47 +0200)
committerJani Nikula <jani.nikula@intel.com>
Thu, 26 Nov 2015 14:30:46 +0000 (16:30 +0200)
commit6a39d7c986be4fd18eb019e9cdbf774ec36c9f77
treef9f10f76502bac80e80cecc9c7386423e3654073
parent39bfcd5235e07e95ad3e70eab8e0b85db181de9e
drm/i915: fix the SDE irq dmesg warnings properly

We had the "The master control interrupt lied (SDE)!" check and error
message in place for a long time without any problems, until

commit aaf5ec2e51ab1d9c5e962b4728a1107ed3ff7a3e
Author: Sonika Jindal <sonika.jindal@intel.com>
Date:   Wed Jul 8 17:07:47 2015 +0530

    drm/i915: Handle HPD when it has actually occurred

caused the errors to start happening. This was bisected and reported,
but the error message was silenced in

commit 97e5ed1111dcc5300a0f59a55248cd243937a8ab
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Fri Oct 23 10:56:12 2015 +0200

    drm/i915: shut up gen8+ SDE irq dmesg noise

shooting the messenger while the debugging for why Sonika's commit
triggered the errors was still in progress.

It looks like we need to read and acknowledge the PCH_PORT_HOTPLUG
register even though the hotplug trigger indicates there isn't a hotplug
irq to handle. The PCH doesn't seem to really ack the the interrupt to
the CPU unless we touch the hotplug register.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Sonika Jindal <sonika.jindal@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92084
Fixes: aaf5ec2e51ab ("drm/i915: Handle HPD when it has actually occurred")
[Jani: added a comment and amended the commit message while applying]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448462843-32739-1-git-send-email-jani.nikula@intel.com
drivers/gpu/drm/i915/i915_irq.c