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Issue 846526 link

Starred by 3 users
Status: Fixed
Owner:
█ dbehr@chromium.org
Last visit > 30 days ago
Closed: Jun 2018
Cc:
█ intel@chromium.org
█ marc...@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 3
Type: Bug
GPU



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WARN_ON_ONCE(!intel_dp->lane_count) in 3.18 at boot time on Chell

Project Member Reported by dbehr@chromium.org, May 24 2018 
[    2.275008] WARNING: CPU: 3 PID: 295 at /mnt/host/source/src/third_party/kernel/v3.18/drivers/gpu/drm/i915/intel_dp.c:4257 intel_dp_check_link_status+0xd0/0x144()
[    2.275021] WARN_ON_ONCE(!intel_dp->lane_count)
[    2.275026] Modules linked in:
[    2.275032]  joydev
[    2.275037] CPU: 3 PID: 295 Comm: frecon Tainted: G        W      3.18.0 #1
[    2.275049] Hardware name: Hewlett-Packard Chell/Chell, BIOS Google_Chell.7820.315.2 03/09/2018
[    2.275058]  0000000000000000 00000000bb683c86 ffff88046a737b48 ffffffffbbf7bde1
[    2.275069]  0000000000000000 ffff88046a737ba0 ffff88046a737b88 ffffffffbb98bfad
[    2.275080]  ffff88046a737c15 ffff88046b6530e8 0000000000000001 ffff88046b653000
[    2.275091] Call Trace:
[    2.275100]  [<ffffffffbbf7bde1>] dump_stack+0x4e/0x71
[    2.275122]  [<ffffffffbb98bfad>] warn_slowpath_common+0x84/0x9f
[    2.275129]  [<ffffffffbb98c0c1>] warn_slowpath_fmt+0x55/0x6b
[    2.275138]  [<ffffffffbbcbf123>] intel_dp_check_link_status+0xd0/0x144
[    2.275147]  [<ffffffffbbcbf73c>] intel_dp_detect+0x5a5/0x928
[    2.275157]  [<ffffffffbbc164ab>] drm_helper_probe_single_connector_modes_merge_bits+0xd6/0x3e2
[    2.275168]  [<ffffffffbb8c4c10>] ? _object_find+0xa4/0xb0
[    2.275176]  [<ffffffffbbc167c9>] ? drm_helper_probe_single_connector_modes_nomerge+0x12/0x12
[    2.275187]  [<ffffffffbbc167dc>] drm_helper_probe_single_connector_modes+0x13/0x15
[    2.275196]  [<ffffffffbbc2dd59>] drm_mode_getconnector+0x117/0x37c
[    2.275205]  [<ffffffffbb8c3442>] drm_ioctl+0x3fa/0x47b
[    2.275213]  [<ffffffffbbc2dc42>] ? drm_mode_getcrtc+0x119/0x119
[    2.275222]  [<ffffffffbb8683bc>] SyS_ioctl+0x46c/0x4b1
[    2.275230]  [<ffffffffbbf80be4>] system_call_fastpath+0x21/0x26

Looks harmless but annoying. Warning removed upstream in 2dd85aeb5bc99e3763dd192cdb95ff405a102c8a

Comment 1 by dbehr@chromium.org, May 25 2018 

We should probably follow it with
14c562c0cde36e87e69918244cdf51a544580d19
and
1a92c70ed8053855811d5e8c62e6a14e1d06e4ab
and their possible deps
Project Member

Comment 2 by bugdroid1@chromium.org, Jun 7 2018

Labels: merge-merged-chromeos-3.18
The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/kernel/+/91277127d929e4be5869811eab3d775ae988c5d3

commit 91277127d929e4be5869811eab3d775ae988c5d3
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu Jun 07 23:52:37 2018

UPSTREAM: drm/i915: tune down the fast link training vs boot fail

It's been unfixed since a while and no one is immediately working on
this. And we have the FIXME already. And now also a task in the DP
team's backlog.

BUG= chromium:846526 
TEST=boot Chell, examine dmesg.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable@vger.kernel.org
Cc: Ville Syrjl <ville.syrjala@linux.intel.com>
References: https://lists.freedesktop.org/archives/intel-gfx/2016-July/101951.html
Acked-by: Ville Syrjl <ville.syrjala@linux.intel.com>
[danvet: Adjust comment per Ville's feedback.]
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161213195414.28923-1-daniel.vetter@ffwll.ch
(cherry picked from commit 2dd85aeb5bc99e3763dd192cdb95ff405a102c8a)
Signed-off-by: Dominik Behr <dbehr@chromium.org>

Change-Id: Ie9edd136576d42169d6b5648f2112dc0620a9673
Reviewed-on: https://chromium-review.googlesource.com/1072949
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Dominik Behr <dbehr@chromium.org>
Reviewed-by: Ilja H. Friedel <ihf@chromium.org>

[modify] https://crrev.com/91277127d929e4be5869811eab3d775ae988c5d3/drivers/gpu/drm/i915/intel_dp.c

Comment 3 by dbehr@chromium.org, Jun 14 2018

Status: Fixed (was: Started)
►

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