From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1755855AbcIFJPw (ORCPT <rfc822;w@1wt.eu>);
        Tue, 6 Sep 2016 05:15:52 -0400
Received: from mga06.intel.com ([134.134.136.31]:26589 "EHLO mga06.intel.com"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S933091AbcIFJOk (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 6 Sep 2016 05:14:40 -0400
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.30,291,1470726000"; 
   d="scan'208";a="1051944419"
From: Jani Nikula <jani.nikula@linux.intel.com>
To: Meelis Roos <mroos@linux.ee>,
        Linux Kernel list <linux-kernel@vger.kernel.org>,
        dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
        Lyude <cpaul@redhat.com>
Subject: Re: i915 WARNING: Missing switch case (16) in gen6_check_mailbox_status
In-Reply-To: <alpine.LRH.2.20.1608291237230.19679@math.ut.ee>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
References: <alpine.LRH.2.20.1608291237230.19679@math.ut.ee>
User-Agent: Notmuch/0.22.1+63~g648dcc7 (https://notmuchmail.org) Emacs/24.4.1 (x86_64-pc-linux-gnu)
Date: Tue, 06 Sep 2016 12:14:10 +0300
Message-ID: <87shtdxue5.fsf@intel.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


Lyude, this is due to

commit 87660502f1a4d51fb043e89a45d30c9917787c22
Author: Lyude <cpaul@redhat.com>
Date:   Wed Aug 17 15:55:53 2016 -0400

    drm/i915/gen6+: Interpret mailbox error flags

and on its way to stable.

BR,
Jani.


On Mon, 29 Aug 2016, Meelis Roos <mroos@linux.ee> wrote:
> Tried 4.8-rc4 on my i5-2400 PC, got this warning:
>
> [   14.579557] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
> [   15.847321] ------------[ cut here ]------------
> [   15.847346] WARNING: CPU: 0 PID: 208 at drivers/gpu/drm/i915/intel_pm.c:7866 sandybridge_pcode_write+0x109/0x1f0 [i915]
> [   15.847348] Missing switch case (16) in gen6_check_mailbox_status
> [   15.847349] Modules linked in: cpufreq_powersave cpufreq_userspace cpufreq_conservative joydev hid_generic usbhid hid x86_pkg_temp_thermal kvm_intel kvm irqbypass crc32c_intel aesni_intel snd_hda_codec_realtek snd_hda_codec_generic iTCO_wdt i915 aes_x86_64 iTCO_vendor_support glue_helper lrw ablk_helper cryptd video i2c_algo_bit drm_kms_helper psmouse pcspkr syscopyarea sysfillrect sysimgblt fb_sys_fops ehci_pci ehci_hcd snd_hda_intel xhci_pci xhci_hcd e1000e snd_hda_codec snd_hwdep usbcore drm snd_hda_core usb_common i2c_i801 ptp pps_core i2c_smbus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer evdev snd tpm_tis lpc_ich parport_pc tpm_tis_core mfd_core parport nuvoton_cir rc_core tpm soundcore floppy w83627ehf hwmon_vid coretemp hwmon eeprom i2c_core loop ip_tables x_tables autofs4
> [   15.847395] CPU: 0 PID: 208 Comm: kworker/0:2 Not tainted 4.8.0-rc4 #213
> [   15.847396] Hardware name:                  /DQ67OW, BIOS SWQ6710H.86A.0066.2012.1105.1504 11/05/2012
> [   15.847412] Workqueue: events intel_gen6_powersave_work [i915]
> [   15.847414]  0000000000000000 ffffffff812d8198 ffff88023191fd70 0000000000000000
> [   15.847417]  ffffffff81056d1e ffff88022ea40000 ffff88023191fdc0 0000000000000000
> [   15.847419]  ffff88022ea4a3c8 ffff88022ea487c0 0ffff88023e21ba0 ffffffff81056d8f
> [   15.847422] Call Trace:
> [   15.847427]  [<ffffffff812d8198>] ? dump_stack+0x46/0x5e
> [   15.847429]  [<ffffffff81056d1e>] ? __warn+0xbe/0xe0
> [   15.847431]  [<ffffffff81056d8f>] ? warn_slowpath_fmt+0x4f/0x60
> [   15.847446]  [<ffffffffa0311a09>] ? sandybridge_pcode_write+0x109/0x1f0 [i915]
> [   15.847459]  [<ffffffffa0313308>] ? intel_gen6_powersave_work+0x2a8/0x1400 [i915]
> [   15.847462]  [<ffffffff8106e4db>] ? process_one_work+0x1eb/0x480
> [   15.847465]  [<ffffffff8106e7b7>] ? worker_thread+0x47/0x4c0
> [   15.847467]  [<ffffffff815649f7>] ? __schedule+0x1d7/0x660
> [   15.847469]  [<ffffffff8106e770>] ? process_one_work+0x480/0x480
> [   15.847472]  [<ffffffff8107398d>] ? kthread+0xbd/0xe0
> [   15.847475]  [<ffffffff8156903f>] ? ret_from_fork+0x1f/0x40
> [   15.847478]  [<ffffffff810738d0>] ? kthread_worker_fn+0x160/0x160
> [   15.847487] ---[ end trace ad9e991297d99be1 ]---

-- 
Jani Nikula, Intel Open Source Technology Center