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Krishna Kurapati df714c9eb0 usb: typec: ucsi: Fix race between typec_switch and role_switch 
commit f5e9bda03a upstream.

When orientation switch is enabled in ucsi glink, there is a xhci
probe failure seen when booting up in host mode in reverse
orientation.

During bootup the following things happen in multiple drivers:

a) DWC3 controller driver initializes the core in device mode when the
dr_mode is set to DRD. It relies on role_switch call to change role to
host.

b) QMP driver initializes the lanes to TYPEC_ORIENTATION_NORMAL as a
normal routine. It relies on the typec_switch_set call to get notified
of orientation changes.

c) UCSI core reads the UCSI_GET_CONNECTOR_STATUS via the glink and
provides initial role switch to dwc3 controller.

When booting up in host mode with orientation TYPEC_ORIENTATION_REVERSE,
then we see the following things happening in order:

a) UCSI gives initial role as host to dwc3 controller ucsi_register_port.
Upon receiving this notification, the dwc3 core needs to program GCTL from
PRTCAP_DEVICE to PRTCAP_HOST and as part of this change, it asserts GCTL
Core soft reset and waits for it to be  completed before shifting it to
host. Only after the reset is done will the dwc3_host_init be invoked and
xhci is probed. DWC3 controller expects that the usb phy's are stable
during this process i.e., the phy init is already done.

b) During the 100ms wait for GCTL core soft reset, the actual notification
from PPM is received by ucsi_glink via pmic glink for changing role to
host. The pmic_glink_ucsi_notify routine first sends the orientation
change to QMP and then sends role to dwc3 via ucsi framework. This is
happening exactly at the time GCTL core soft reset is being processed.

c) When QMP driver receives typec switch to TYPEC_ORIENTATION_REVERSE, it
then re-programs the phy at the instant GCTL core soft reset has been
asserted by dwc3 controller due to which the QMP PLL lock fails in
qmp_combo_usb_power_on.

d) After the 100ms of GCTL core soft reset is completed, the dwc3 core
goes for initializing the host mode and invokes xhci probe. But at this
point the QMP is non-responsive and as a result, the xhci plat probe fails
during xhci_reset.

Fix this by passing orientation switch to available ucsi instances if
their gpio configuration is available before ucsi_register is invoked so
that by the time, the pmic_glink_ucsi_notify provides typec_switch to QMP,
the lane is already configured and the call would be a NOP thus not racing
with role switch.

Cc: stable@vger.kernel.org
Fixes: c6165ed2f4 ("usb: ucsi: glink: use the connector orientation GPIO to provide switch events")
Suggested-by: Wesley Cheng <quic_wcheng@quicinc.com>
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20240301040914.458492-1-quic_kriskura@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-04-03 15:11:56 +02:00
arch hexagon: vmlinux.lds.S: handle attributes section 2024-04-03 15:11:49 +02:00
block block: Do not force full zone append completion in req_bio_endio() 2024-04-03 15:11:50 +02:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto Revert "crypto: pkcs7 - remove sha1 support" 2024-04-03 15:11:35 +02:00
Documentation x86/Kconfig: Remove CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT 2024-04-03 15:11:42 +02:00
drivers usb: typec: ucsi: Fix race between typec_switch and role_switch 2024-04-03 15:11:56 +02:00
fs exec: Fix NOMMU linux_binprm::exec in transfer_args_to_stack() 2024-04-03 15:11:49 +02:00
include scsi: sd: Fix TCG OPAL unlock on system resume 2024-04-03 15:11:54 +02:00
init init: open /initrd.image with O_LARGEFILE 2024-04-03 15:11:47 +02:00
io_uring io_uring/waitid: always remove waitid entry for cancel all 2024-04-03 15:11:28 +02:00
ipc Many singleton patches against the MM code. The patch series which are 2023-11-02 19:38:47 -10:00
kernel prctl: generalize PR_SET_MDWE support check to be per-arch 2024-04-03 15:11:47 +02:00
lib pci_iounmap(): Fix MMIO mapping leak 2024-04-03 15:11:07 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: cachestat: fix two shmem bugs 2024-04-03 15:11:49 +02:00
net Bluetooth: hci_sync: Fix not checking error on hci_cmd_sync_cancel_sync 2024-04-03 15:11:52 +02:00
rust rust: Ignore preserve-most functions 2024-01-25 15:45:09 -08:00
samples eventfd: simplify eventfd_signal() 2024-04-03 15:11:23 +02:00
scripts kbuild: Move -Wenum-{compare-conditional,enum-conversion} into W=1 2024-04-03 15:11:22 +02:00
security landlock: Warn once if a Landlock action is requested while disabled 2024-04-03 15:11:19 +02:00
sound ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs 2024-04-03 15:11:54 +02:00
tools selftests/mm: fix ARM related issue with fork after pthread_create 2024-04-03 15:11:49 +02:00
usr arch: Remove Itanium (IA-64) architecture 2023-09-11 08:13:17 +00:00
virt eventfd: simplify eventfd_signal() 2024-04-03 15:11:23 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: generate kernel.spec in rpmbuild/SPECS/ 2023-10-03 20:49:09 +09:00
.mailmap 12 hotfixes. 2 are cc:stable and the remainder either address post-6.7 2024-01-05 13:46:18 -08:00
.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 12 hotfixes. 2 are cc:stable and the remainder either address post-6.7 2024-01-05 13:46:18 -08:00
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 12 hotfixes. 2 are cc:stable and the remainder either address post-6.7 2024-01-05 13:46:18 -08:00
Makefile Linux 6.7.11 2024-03-26 18:22:50 -04:00
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.