[Bug 108511] [CI][BAT] igt at pm_rpm@module-reload - dmesg-fail - Failed assertion: c1->mmWidth == c2->mmWidth

Wed Nov 28 13:35:11 UTC 2018

https://bugs.freedesktop.org/show_bug.cgi?id=108511

--- Comment #5 from Anshuman Gupta <anshuman.gupta at intel.com> ---
(In reply to Martin Peres from comment #3)
> (In reply to Anshuman Gupta from comment #2)
> > It is not reproducible anymore, i have tested it on drm-tip 4.19.0-rc8 and
> > on drm internal latest.
> > 
> > sudo ./tests/pm_rpm --run-subtest module-reload
> > IGT-Version: 1.23-gea37f9c (x86_64) (Linux: 4.19.0-rc8-custom x86_64)
> > Runtime PM support: 1
> > PC8 residency support: 0
> > DMC: fw loaded: yes
> > Starting subtest: module-reload
> > Reloading i915 with disable_display=1 mmio_debug=-1
> > 
> > Runtime PM support: 1
> > PC8 residency support: 0
> > DMC: fw loaded: yes
> > Reloading i915 with mmio_debug=-1
> > 
> > Runtime PM support: 1
> > PC8 residency support: 0
> > 
> > PS: When tested on latest drm-tip, test is getting killed due to "unable to
> > handle kernel paging request" at kernel, which doesn't look like a similar
> > issue.
> > 
> > [  246.498589] BUG: unable to handle kernel paging request at
> > ffffffffc03802f8
> > [  246.498594] PGD 17440c067 P4D 17440c067 PUD 17440e067 PMD 177950067 PTE 0
> > [  246.498599] Oops: 0000 [#1] SMP PTI
> > [  246.498603] CPU: 1 PID: 2429 Comm: pm_rpm Tainted: G  R              
> > 4.20.0-rc1+ #1
> 
> The reproduction rate has been low, to say the least. So don't assume this
> is fixed :s
> 
> I would say there are easier bugs to get started with:
> https://intel-gfx-ci.01.org/cibuglog/ <-- order by reproduction rate and
> pick one you like!

I have tried to reproduced the issue, but not get any luck  to reproduce it.

However, i had analyzed the logs and able to conclude it logically from the
logs.

After resuming there is hot plug event from hdmi and it is reading the invalid
EDID and tries to read EDID after enabling GPIO bit banging, there also it has
failed to read EDID and  HDMI connector status changed from connected to
disconnected.

<7> [343.557663] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:125:HDMI-A-2]
<7> [343.557756] [drm:intel_hdmi_detect [i915]] [CONNECTOR:125:HDMI-A-2]
<7> [343.569930] [drm:intel_runtime_resume [i915]] Resuming device
--------------------------------------------------------------------------
<4> [343.632835] i915 0000:00:02.0: HDMI-A-2: EDID is invalid:
<4> [343.632841] \x09[00] BAD  00 ff ff ff ff ff ff 00 05 e3 79 28 2b 09 00 00
<4> [343.632844] \x09[00] BAD  32 1b 01 03 80 3e 22 78 2a 08 a5 a2 57 4f a2 28
<4> [343.632847] \x09[00] BAD  0f 50 54 bf ef 00 d1 c0 b3 00 95 00 81 80 80 40
<4> [343.632849] \x09[00] BAD  81 c0 01 01 01 01 4d d0 00 a0 f0 70 3e 80 30 20
<4> [343.632852] \x09[00] BAD  20 00 2d 55 21 00 00 1a a3 66 00 a0 f0 70 1f 80
<4> [343.632854] \x09[00] BAD  30 20 35 00 6d 55 21 00 00 1a 00 00 00 fc 00 55
<4> [343.632857] \x09[00] BAD  32 38 37 39 47 36 0a 20 20 20 20 20 00 00 00 fd
<4> [343.632859] \x09[00] BAD  00 17 50 1e 8c 3c 00 0a 20 20 20 20 20 20 01 88
<7> [343.632933] [drm:intel_hdmi_set_edid [i915]] HDMI GMBUS EDID read failed,
retry using GPIO bit-banging
<7> [343.632989] [drm:intel_gmbus_force_bit [i915]] enabling bit-banging on
i915 gmbus dpb. force bit now 1
<7> [343.704493] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter
i915 gmbus dpb
<7> [343.704595] [drm:intel_gmbus_force_bit [i915]] disabling bit-banging on
i915 gmbus dpb. force bit now 0
<7> [343.705207] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for
addr: 0040 w(1)
<7> [343.705259] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first
message, retry
<7> [343.705817] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for
addr: 0040 w(1)
--------------------------------------------------------------------------------
<7> [343.710557] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:125:HDMI-A-2] status updated from connected to disconnected
<7> [343.710563] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:125:HDMI-A-2] disconnected

HDMI EDID read may get failed due to poor device or poor hdmi cable while
resuming, which caused mismatch in connector presuspend width and during
suspend.  

I had a discussion with Shashank,  this is really specific to HDMI DRM policy
to continue with modeset despite an Invalid EDID.

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