[ehl] board does not support soft reboot

[Doug Jacobs]

[Summary]Telling the EHL board to reboot from within Ubuntu causes it to hang, forcing you to do a hard reboot.

[Steps to reproduce]
1. Open terminal window.
2. $ reboot

[Expected result]
System should gracefullyl reboot.

[Actual result]
Screen goes blank except for a cursor. System does not reboot. You must hard reboot (pull the plug)

[Failure rate]100%

[Additional information]
CID: 202105-29063
SKU:
system-manufacturer: Intel Corporation
system-product-name: Elkhart Lake Embedded Platform
bios-version: EHLSFWI1.R00.2091.A00.2002250754
CPU: Genuine Intel(R) CPU 0000 @ 1.90GHz (4x)
GPU: 00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:4571]
kernel-version: 5.11.0-1009-intel

[Doug Jacobs (djacobs98)]

Automatically attached

[Doug Jacobs (djacobs98)]

Automatically attached

[Doug Jacobs (djacobs98)]

Automatically attached

[Doug Jacobs (djacobs98)]

Automatically attached

[Anthony Wong (anthonywong)]

needs to revert "pinctrl: intel: Add Intel Elkhart Lake pin controller support" until there is BIOS fix.

[Sachin Mokashi (sachinmokashi)]

This is a known issue on EHL, please track the solution here:
https://github.com/thesofproject/linux/issues/2828

As mentioned in the link, Please disable CONFIG_PINCTRL_ELKHARTLAKE=y for EHL until MR2 BIOS is released.

[Hsuan-Yu Lin (shanelin)]

Test passed after reverting "pinctrl: intel: Add Intel Elkhart Lake pin controller support"

CID: 202105-29064
BIOS: EHLSFWI1.R00.2091.A00.2002250754

[Hsuan-Yu Lin (shanelin)]

Hi @Doug,

Since the same patch fixed this issue, please use bug 1938413 comment #9 to verify this issue.

Thanks!

[Doug Jacobs (djacobs98)]

Applied the patch as instructed in https://bugs.launchpad.net/bugs/1938413:

Hi @Doug,

Please use this test kernel to verify this issue.

version: 5.11.0-1011-intel #12+lp1938408~lp1938413

[Installation steps]
1. tar -zxvf revert.tgz
2. cd revert
3. sudo dpkg -i *.deb

After the patch was applied, I did a hard reboot.

Once the system finished booting, I brought up a terminal window and typed 'reboot'

The system started to reboot but hung at the splash screen. The keyboard is inactive.

I had to hard reboot the system to get it to boot back into the OS.

[Hsuan-Yu Lin (shanelin)]

Patches are ready and under review.

[Hsuan-Yu Lin (shanelin)]

Hi @Doug,

The same test kernel has been built. Please refer to bug 1938413 comment #17.
Thanks!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Hsuan-Yu Lin (shanelin)]

Test passed (5/5) for:
CID: 202105-29064
BIOS: EHLSFWI1.R00.2091.A00.2002250754
Kernel: $ uname -a
Linux u-Elkhart-Lake-Embedded-Platform 5.11.0-1012-intel #14-Ubuntu SMP Wed Aug 11 08:52:10 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux