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| author | Chunfeng Yun <chunfeng.yun@mediatek.com> | 2021-08-26 16:36:37 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-26 13:41:52 +0200 |
| commit | d98a30ccdc839947c9233369744341d1fa54439c (patch) | |
| tree | b697f6f128ca3b9c667c70f37834713fe794f34c /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | 50fdcb56c41904c3535687a0e1e1dbd9423a8f9a (diff) | |
usb: mtu3: fix random remote wakeup
Some platforms, e.g. 8183/8192, use low level latch way to keep
wakeup signal, it may latch a wrong signal if debounce more time,
and enable wakeup earlier.
____________________
ip_sleep ____/ \__________
___________________
wakeup_signal ____________/ \______
_______________________________
wakeup_en _______/
^ ^
|(1) |(2)
latch wakeup_signal mistakenly at (1), should latch it at (2);
Workaround: delay about 100us to enable wakeup, meanwhile decrease
debounce time.
Fixes: b1a344589eea ("usb: mtu3: support ip-sleep wakeup for MT8183")
Cc: stable@vger.kernel.org
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20210826083637.33237-2-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions