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Benson Leung 2433adbe30 usb: typec: ucsi: psy: Fix voltage and current max for non-Fixed PDOs 
[ Upstream commit 6811e0a08b ]

ucsi_psy_get_voltage_max and ucsi_psy_get_current_max are calculated
using whichever pdo is in the last position of the src_pdos array, presuming
it to be a fixed pdo, so the pdo_fixed_voltage or pdo_max_current
helpers are used on that last pdo.

However, non-Fixed PDOs such as Battery PDOs, Augmented PDOs (used for AVS and
for PPS) may exist, and are always at the end of the array if they do.
In the event one of these more advanced chargers are attached the helpers for
fixed return mangled values.

Here's an example case of a Google Pixel Flex Dual Port 67W USB-C Fast Charger
with PPS support:
POWER_SUPPLY_NAME=ucsi-source-psy-cros_ec_ucsi.4.auto2
POWER_SUPPLY_TYPE=USB
POWER_SUPPLY_CHARGE_TYPE=Standard
POWER_SUPPLY_USB_TYPE=C [PD] PD_PPS PD_DRP
POWER_SUPPLY_ONLINE=1
POWER_SUPPLY_VOLTAGE_MIN=5000000
POWER_SUPPLY_VOLTAGE_MAX=13400000
POWER_SUPPLY_VOLTAGE_NOW=20000000
POWER_SUPPLY_CURRENT_MAX=5790000
POWER_SUPPLY_CURRENT_NOW=3250000

Voltage Max is reading as 13.4V, but that's an incorrect decode of the PPS
APDO in the last position. Same goes for CURRENT_MAX. 5.79A is incorrect.

Instead, enumerate through the src_pdos and filter just for Fixed PDOs for
now, and find the one with the highest voltage and current respectively.

After, from the same charger:
POWER_SUPPLY_NAME=ucsi-source-psy-cros_ec_ucsi.4.auto2
POWER_SUPPLY_TYPE=USB
POWER_SUPPLY_CHARGE_TYPE=Standard
POWER_SUPPLY_USB_TYPE=C [PD] PD_PPS PD_DRP
POWER_SUPPLY_ONLINE=1
POWER_SUPPLY_VOLTAGE_MIN=5000000
POWER_SUPPLY_VOLTAGE_MAX=20000000
POWER_SUPPLY_VOLTAGE_NOW=20000000
POWER_SUPPLY_CURRENT_MAX=4000000
POWER_SUPPLY_CURRENT_NOW=3250000

Signed-off-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20251208174918.289394-3-bleung@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:20:32 -05:00
arch m68k: nommu: fix memmove() with differently aligned src and dest for 68000 2026-03-04 07:20:31 -05:00
block block: decouple secure erase size limit from discard size limit 2026-03-04 07:19:38 -05:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-01-30 10:32:12 +01:00
Documentation hwmon: (nct6683) Add customer ID for ASRock Z590 Taichi 2026-03-04 07:20:06 -05:00
drivers usb: typec: ucsi: psy: Fix voltage and current max for non-Fixed PDOs 2026-03-04 07:20:32 -05:00
fs ext4: propagate flags to convert_initialized_extent() 2026-03-04 07:20:21 -05:00
include PCI/bwctrl: Disable BW controller on Intel P45 using a quirk 2026-03-04 07:20:27 -05:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/timeout: annotate data race in io_flush_timeouts() 2026-03-04 07:19:36 -05:00
ipc ipc: don't audit capability check in ipc_permissions() 2026-02-26 14:59:19 -08:00
kernel tracing: Fix false sharing in hwlat get_sample() 2026-03-04 07:20:29 -05:00
lib objpool: fix the overestimation of object pooling metadata size 2026-02-26 14:59:36 -08:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/slab: fix false lockdep warning in __kfree_rcu_sheaf() 2026-02-26 14:59:14 -08:00
net 9p/xen: protect xen_9pfs_front_free against concurrent calls 2026-03-04 07:20:31 -05:00
rust rust: cpufreq: always inline functions using build_assert with arguments 2026-03-04 07:19:37 -05:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts modpost: Amend ppc64 save/restfpr symnames for -Os build 2026-03-04 07:20:07 -05:00
security apparmor: fix aa_label to return state from compount and component match 2026-02-26 14:59:42 -08:00
sound ALSA: usb-audio: Add iface reset and delay quirk for AB13X USB Audio 2026-03-04 07:20:09 -05:00
tools rtla: Fix NULL pointer dereference in actions_parse 2026-03-04 07:20:13 -05:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: Don't clobber irqfd routing type when deassigning irqfd 2026-02-11 13:41:44 +01:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.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 MAINTAINERS: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.15 2026-02-27 16:05:10 -05:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.