diff options
author | Nicolas Dumazet <ndumazet@google.com> | 2022-11-09 15:29:46 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-09 16:07:47 +0300 |
commit | 181135bb20dcb184edd89817831b888eb8132741 (patch) | |
tree | c8e46bddef3f6ce2a3c0741e8f832df107de75c7 /drivers/cpufreq/ti-cpufreq.c | |
parent | 9d5333c931347005352d5b8beaa43528c94cfc9c (diff) | |
download | linux-181135bb20dcb184edd89817831b888eb8132741.tar.xz |
usb: add NO_LPM quirk for Realforce 87U Keyboard
Before adding this quirk, this (mechanical keyboard) device would not be
recognized, logging:
new full-speed USB device number 56 using xhci_hcd
unable to read config index 0 descriptor/start: -32
chopping to 0 config(s)
It would take dozens of plugging/unpuggling cycles for the keyboard to
be recognized. Keyboard seems to simply work after applying this quirk.
This issue had been reported by users in two places already ([1], [2])
but nobody tried upstreaming a patch yet. After testing I believe their
suggested fix (DELAY_INIT + NO_LPM + DEVICE_QUALIFIER) was probably a
little overkill. I assume this particular combination was tested because
it had been previously suggested in [3], but only NO_LPM seems
sufficient for this device.
[1]: https://qiita.com/float168/items/fed43d540c8e2201b543
[2]: https://blog.kostic.dev/posts/making-the-realforce-87ub-work-with-usb30-on-Ubuntu/
[3]: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678477
Cc: stable@vger.kernel.org
Signed-off-by: Nicolas Dumazet <ndumazet@google.com>
Link: https://lore.kernel.org/r/20221109122946.706036-1-ndumazet@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/cpufreq/ti-cpufreq.c')
0 files changed, 0 insertions, 0 deletions