Ubuntu
lunar package

[Mediatek] mt8195-demo: Fix hardware watchdog reset at boot time around 10 sec.

Bug #2036577 reported by Macpaul Lin on 2023-09-19

This bug report was marked for expiration 214 days ago. (find out why)

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	linux (Ubuntu)	Incomplete	Undecided	Unassigned
	lunar (Ubuntu)	Incomplete	Undecided	Unassigned

Bug Description

[Impact]
hardware reset during boot time.

[Fix]
Compare to generic kernel config for arm64
file: arch/arm64/configs/defconfig
The CONFIG_MEDIATEK_WATCHDOG should be enabled "built-in" in generic kernel settings.

CONFIG_MEDIATEK_WATCHDOG=y

I've discovered that the module mtk_wdt.ko (CONFIG_MEDIATEK_WATCHDOG) must be set as built-in to prevent the system from encountering a hardware reset during the boot process. I've tried building it as a module and installing it into initrd, and I've also attempted to set softdep for it. However, I still can't find it being probed in the initcall debug dump. The system also reboots around 10 seconds into the boot time. After setting CONFIG_MEDIATEK_WATCHDOG=y, the hardware reset issue was resolved and the system was able to boot into the console.

[Other info]
effected kernel (5.19~latest)
ubuntu kernel for lunar, Kinetic, and Mantic.

See original description

Tags:

Revision history for this message

Macpaul Lin (macpaul-lin-mtk) wrote on 2023-09-19:

patch Edit (1.8 KiB, text/plain)

Macpaul Lin (macpaul-lin-mtk) on 2023-09-19

description:

updated

Revision history for this message

Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote on 2023-09-19: Missing required logs.

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 2036577

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status:	New → Incomplete

Revision history for this message

Ubuntu Foundations Team Bug Bot (crichton) wrote on 2023-09-19:

The attachment "patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

tags:

added: patch

Revision history for this message

Macpaul Lin (macpaul-lin-mtk) wrote on 2023-09-20:

According to the log:

1. By searching "wdt|watchdog", 'mtk-wdt' cannot be found even we've installed 'mtk_wdt.ko' into initrd.img.

2. The system will always hardware reset around 9~11 seconds.

3. BL2: TFA will show the "WDT: Last reset was hardware watchdog".

989: WDT: Started watchdog@10007000 with servicing (60s timeout)
2434: [ 0.191906] calling gtdt_sbsa_gwdt_init+0x0/0x128 @ 1
2435: [ 0.191915] initcall gtdt_sbsa_gwdt_init+0x0/0x128 returned 0 after 0 usecs
4657: NOTICE: WDT: Status = 0x80000000
4658: NOTICE: WDT: Last reset was hardware watchdog
4784: [PMIC] [pmic_check_rst] AP Watchdog
4787: [PMIC] [pmic_wdt_set] TOP_RST_MISC=0x225