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Filename Latest commit message Latest commit date
Josua Mayer eb1a33195a net: rfkill: gpio: prevent value glitch during probe 
commit b2f750c3a80b285cd60c9346f8c96bd0a2a66cde upstream.

When either reset- or shutdown-gpio have are initially deasserted,
e.g. after a reboot - or when the hardware does not include pull-down,
there will be a short toggle of both IOs to logical 0 and back to 1.

It seems that the rfkill default is unblocked, so the driver should not
glitch to output low during probe.
It can lead e.g. to unexpected lte modem reconnect:

[1] root@localhost:~# dmesg | grep "usb 2-1"
[    2.136124] usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd
[   21.215278] usb 2-1: USB disconnect, device number 2
[   28.833977] usb 2-1: new SuperSpeed USB device number 3 using xhci-hcd

The glitch has been discovered on an arm64 board, now that device-tree
support for the rfkill-gpio driver has finally appeared :).

Change the flags for devm_gpiod_get_optional from GPIOD_OUT_LOW to
GPIOD_ASIS to avoid any glitches.
The rfkill driver will set the intended value during rfkill_sync_work.

Fixes: 7176ba23f8 ("net: rfkill: add generic gpio rfkill driver")
Signed-off-by: Josua Mayer <josua@solid-run.com>
Link: https://lore.kernel.org/r/20231004163928.14609-1-josua@solid-run.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-10-25 11:53:21 +02:00
arch KVM: x86: Mask LVTPC when handling a PMI 2023-10-25 11:53:21 +02:00
block
certs
crypto X.509: if signature is unsupported skip validation 2023-09-23 10:59:55 +02:00
Documentation Documentation: sysctl: align cells in second content column 2023-10-25 11:53:20 +02:00
drivers qed: fix LL2 RX buffer allocation 2023-10-25 11:53:21 +02:00
fs ceph: fix incorrect revoked caps assert in ceph_fill_file_size() 2023-10-25 11:53:19 +02:00
include xfrm: fix a data-race in xfrm_gen_index() 2023-10-25 11:53:21 +02:00
init
ipc
kernel cgroup: Remove duplicates in cgroup v1 tasks file 2023-10-25 11:53:19 +02:00
lib lib/test_meminit: fix off-by-one error in test_pages() 2023-10-25 11:53:17 +02:00
LICENSES
mm tmpfs: verify {g,u}id mount options correctly 2023-09-23 10:59:40 +02:00
net net: rfkill: gpio: prevent value glitch during probe 2023-10-25 11:53:21 +02:00
samples
scripts modpost: add missing else to the "of" check 2023-10-10 21:46:44 +02:00
security ima: rework CONFIG_IMA dependency block 2023-10-10 21:46:46 +02:00
sound ALSA: hda: Disable power save for solving pop issue on Lenovo ThinkCentre M70q 2023-10-10 21:46:41 +02:00
tools cpupower: add Makefile dependencies for install targets 2023-10-10 21:46:45 +02:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
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Kconfig
MAINTAINERS
Makefile Linux 5.4.258 2023-10-10 21:46:46 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.