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Pali Rohár b01d622d76 phy: marvell: phy-mvebu-a3700-comphy: Reset COMPHY registers before USB 3.0 power on 
Turris MOX board with older ARM Trusted Firmware version v1.5 is not able
to detect any USB 3.0 device connected to USB-A port on Mox-A module after
commit 0a6fc70d76 ("phy: marvell: phy-mvebu-a3700-comphy: Remove broken
reset support"). On the other hand USB 2.0 devices connected to the same
USB-A port are working fine.

It looks as if the older firmware configures COMPHY registers for USB 3.0
somehow incompatibly for kernel driver. Experiments show that resetting
COMPHY registers via setting SFT_RST auto-clearing bit in COMPHY_SFT_RESET
register fixes this issue.

Reset the COMPHY in mvebu_a3700_comphy_usb3_power_on() function as a first
step after selecting COMPHY lane and USB 3.0 function. With this change
Turris MOX board can successfully detect USB 3.0 devices again.

Before the above mentioned commit this reset was implemented in PHY reset
method, so this is the reason why there was no issue with older firmware
version then.

Fixes: 0a6fc70d76 ("phy: marvell: phy-mvebu-a3700-comphy: Remove broken reset support")
Reported-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Pali Rohár <pali@kernel.org>
Tested-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Link: https://lore.kernel.org/r/20220920121154.30115-1-pali@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
History 2022-10-17 11:09:34 +05:30
arch Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
block Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
certs certs: make system keyring depend on built-in x509 parser 2022-09-24 04:31:18 +09:00
crypto treewide: use get_random_bytes() when possible 2022-10-11 17:42:58 -06:00
Documentation dt-binding: phy: Add i.MX8MP PCIe PHY binding 2022-10-17 11:01:02 +05:30
drivers phy: marvell: phy-mvebu-a3700-comphy: Reset COMPHY registers before USB 3.0 power on 2022-10-17 11:09:34 +05:30
fs Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
include Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
init - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
io_uring io_uring/rw: ensure kiocb_end_write() is always called 2022-10-12 16:30:56 -06:00
ipc - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
kernel Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
lib Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
net Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
rust Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
samples VFIO updates for v6.1-rc1 2022-10-12 14:46:48 -07:00
scripts Kbuild fixes for v6.1 2022-10-16 11:12:22 -07:00
security - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in 2022-10-10 17:53:04 -07:00
sound sound fixes for 6.1-rc1 2022-10-14 13:22:14 -07:00
tools perf tools changes for v6.1: 2nd batch 2022-10-16 15:14:29 -07:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt VFIO updates for v6.1-rc1 2022-10-12 14:46:48 -07:00
.clang-format PCI/DOE: Add DOE mailbox support functions 2022-07-19 15:38:04 -07:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS drm for 5.20/6.0 2022-08-03 19:52:08 -07:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS OpenRISC 6.1 Updates 2022-10-15 16:47:33 -07:00
Makefile Linux 6.1-rc1 2022-10-16 15:36:24 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.