Public bug reported:
[Impact]
Encounter BT command timeout issue when doing reboot test, and BT becomes
unusable.
Mar 15 22:04:44 u-Inspiron-15-3525 kernel: [ 463.633675] usb 3-4: reset
high-speed USB device number 3 using xhci_hcd
Mar 15 22:04:45 u-Inspiron-15-3525 kernel: [ 465.027012] Bluetooth: hci0:
command 0x2005 tx timeout
Mar 15 22:04:47 u-Inspiron-15-3525 kernel: [ 467.043176] Bluetooth: hci0:
command 0x2041 tx timeout
[Fix]
Backport below 2 commit from v5.15-rc1 fix this issue
e947802657cb Bluetooth: btusb: Support Bluetooth Reset for Mediatek Chip(MT7921)
0b10c8c84c0c Bluetooth: btusb: Record debug log for Mediatek Chip.
[Test]
Verified on the problem machine, and confirmed it works
[Where problems could occur]
It adds a new function to cmd_timeout callback, so it won't affect old
behaviors. This only affects the chip which has command timeout issue, and
could reset the chip when encounter the issue.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux-oem-5.14 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-5.14 (Ubuntu Focal)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress
** Tags: oem-priority originate-from-1965199 somerville
** Also affects: linux-oem-5.14 (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux-oem-5.14 (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux-oem-5.14 (Ubuntu Focal)
Assignee: (unassigned) => AceLan Kao (acelankao)
** Changed in: linux-oem-5.14 (Ubuntu)
Status: New => Invalid
** Tags added: oem-priority originate-from-1965199 somerville
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https://bugs.launchpad.net/bugs/1965467
Title:
Need to reset MT7921 BT when the firmware hang or command no response
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