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Hugo Villeneuve b34b718a7e serial: sc16is7xx: fix bug when first setting GPIO direction 
commit 9baeea723c upstream.

When configuring a pin as an output pin with a value of logic 0, we
end up as having a value of logic 1 on the output pin. Setting a
logic 0 a second time (or more) after that will correctly output a
logic 0 on the output pin.

By default, all GPIO pins are configured as inputs. When we enter
sc16is7xx_gpio_direction_output() for the first time, we first set the
desired value in IOSTATE, and then we configure the pin as an output.
The datasheet states that writing to IOSTATE register will trigger a
transfer of the value to the I/O pin configured as output, so if the
pin is configured as an input, nothing will be transferred.

Therefore, set the direction first in IODIR, and then set the desired
value in IOSTATE.

This is what is done in NXP application note AN10587.

Fixes: dfeae619d7 ("serial: sc16is7xx")
Cc: stable@vger.kernel.org
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Reviewed-by: Lech Perczak <lech.perczak@camlingroup.com>
Tested-by: Lech Perczak <lech.perczak@camlingroup.com>
Link: https://lore.kernel.org/r/20230807214556.540627-6-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-19 13:37:17 +08:00
arch mmc: au1xmmc: force non-modular build and remove symbol_get usage 2023-09-19 13:37:15 +08:00
block block/partition: fix signedness issue for Amiga partitions 2023-08-20 15:24:51 +08:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2023-04-19 17:50:34 +08:00
crypto KEYS: asymmetric: Copy sig and digest in public_key_verify_signature() 2023-08-20 15:21:12 +08:00
Documentation ACPI: thermal: Drop nocrt parameter 2023-09-05 01:25:15 +08:00
drivers serial: sc16is7xx: fix bug when first setting GPIO direction 2023-09-19 13:37:17 +08:00
fs ksmbd: replace one-element array with flex-array member in struct smb2_ea_info 2023-09-19 13:37:15 +08:00
include module: Expose module_init_layout_section() 2023-09-05 01:25:15 +08:00
init x86/mm: Initialize text poking earlier 2023-08-20 16:01:29 +08:00
io_uring io_uring: correct check for O_TMPFILE 2023-08-20 16:01:40 +08:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2023-04-19 17:56:54 +08:00
kernel modules: only allow symbol_get of EXPORT_SYMBOL_GPL modules 2023-09-19 13:37:15 +08:00
lib radix tree: remove unused variable 2023-09-05 01:25:09 +08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm: memory-failure: fix unexpected return value in soft_offline_page() 2023-09-05 01:25:11 +08:00
net can: raw: add missing refcount for memory leak fix 2023-09-05 01:25:11 +08:00
samples samples: ftrace: Save required argument registers in sample trampolines 2023-08-20 16:01:05 +08:00
scripts kbuild: Disable GCOV for *.mod.o 2023-08-20 15:24:38 +08:00
security selinux: set next pointer before attaching to list 2023-09-05 01:25:08 +08:00
sound ALSA: usb-audio: Fix init call orders for UAC1 2023-09-19 13:37:16 +08:00
tools objtool/x86: Fix SRSO mess 2023-09-05 01:25:02 +08:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2023-04-19 17:44:58 +08:00
virt KVM: Grab a reference to KVM for VM and vCPU stats file descriptors 2023-08-20 16:01:23 +08:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS iio: stx104: Move to addac subdirectory 2023-08-28 23:26:58 +08:00
Makefile Linux 5.15.130 2023-09-05 01:25:16 +08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00
stfsync.txt update sync 2023-09-05 01:29:54 +08:00

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.