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Claudiu Beznea 91df6604bb net: phy: micrel: populate .soft_reset for KSZ9131 [ Upstream commit `e398822c47` ] The RZ/G3S SMARC Module has 2 KSZ9131 PHYs. In this setup, the KSZ9131 PHY is used with the ravb Ethernet driver. It has been discovered that when bringing the Ethernet interface down/up continuously, e.g., with the following sh script: $ while :; do ifconfig eth0 down; ifconfig eth0 up; done the link speed and duplex are wrong after interrupting the bring down/up operation even though the Ethernet interface is up. To recover from this state the following configuration sequence is necessary (executed manually): $ ifconfig eth0 down $ ifconfig eth0 up The behavior has been identified also on the Microchip SAMA7G5-EK board which runs the macb driver and uses the same PHY. The order of PHY-related operations in ravb_open() is as follows: ravb_open() -> ravb_phy_start() -> ravb_phy_init() -> of_phy_connect() -> phy_connect_direct() -> phy_attach_direct() -> phy_init_hw() -> phydev->drv->soft_reset() phydev->drv->config_init() phydev->drv->config_intr() phy_resume() kszphy_resume() The order of PHY-related operations in ravb_close is as follows: ravb_close() -> phy_stop() -> phy_suspend() -> kszphy_suspend() -> genphy_suspend() // set BMCR_PDOWN bit in MII_BMCR In genphy_suspend() setting the BMCR_PDWN bit in MII_BMCR switches the PHY to Software Power-Down (SPD) mode (according to the KSZ9131 datasheet). Thus, when opening the interface after it has been previously closed (via ravb_close()), the phydev->drv->config_init() and phydev->drv->config_intr() reach the KSZ9131 PHY driver via the ksz9131_config_init() and kszphy_config_intr() functions. KSZ9131 specifies that the MII management interface remains operational during SPD (Software Power-Down), but (according to manual): - Only access to the standard registers (0 through 31) is supported. - Access to MMD address spaces other than MMD address space 1 is possible if the spd_clock_gate_override bit is set. - Access to MMD address space 1 is not possible. The spd_clock_gate_override bit is not used in the KSZ9131 driver. ksz9131_config_init() configures RGMII delay, pad skews and LEDs by accessesing MMD registers other than those in address space 1. The datasheet for the KSZ9131 does not specify what happens if registers from an unsupported address space are accessed while the PHY is in SPD. To fix the issue the .soft_reset method has been instantiated for KSZ9131, too. This resets the PHY to the default state before doing any configurations to it, thus switching it out of SPD. Fixes: `bff5b4b373` ("net: phy: micrel: add Microchip KSZ9131 initial driver") Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2024-01-25 15:45:26 -08:00
arch	s390/pci: fix max size calculation in zpci_memcpy_toio()	2024-01-25 15:45:26 -08:00
block	block: Remove special-casing of compound pages	2024-01-25 15:45:14 -08:00
certs	This update includes the following changes:	2023-11-02 16:15:30 -10:00
crypto	crypto: scomp - fix req->dst buffer overflow	2024-01-25 15:44:43 -08:00
Documentation	rcu: Restrict access to RCU CPU stall notifiers	2024-01-25 15:45:18 -08:00
drivers	net: phy: micrel: populate .soft_reset for KSZ9131	2024-01-25 15:45:26 -08:00
fs	ceph: select FS_ENCRYPTION_ALGS if FS_ENCRYPTION	2024-01-25 15:45:13 -08:00
include	bus: mhi: ep: Pass mhi_ep_buf_info struct to read/write APIs	2024-01-25 15:45:22 -08:00
init	rootfs: Fix support for rootfstype= when root= is given	2024-01-25 15:45:15 -08:00
io_uring	io_uring: ensure local task_work is run on wait timeout	2024-01-25 15:45:13 -08:00
ipc	Many singleton patches against the MM code. The patch series which are	2023-11-02 19:38:47 -10:00
kernel	rcu: Restrict access to RCU CPU stall notifiers	2024-01-25 15:45:18 -08:00
lib	test_bpf: Rename second ALU64_SMOD_X to ALU64_SMOD_K	2024-01-25 15:44:50 -08:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	mm/memory_hotplug: fix memmap_on_memory sysfs value retrieval	2024-01-20 11:53:02 +01:00
net	rxrpc: Fix use of Don't Fragment flag	2024-01-25 15:45:26 -08:00
rust	rust: Ignore preserve-most functions	2024-01-25 15:45:09 -08:00
samples	Landlock updates for v6.7-rc1	2023-11-03 09:28:53 -10:00
scripts	scripts/decode_stacktrace.sh: optionally use LLVM utilities	2024-01-20 11:53:02 +01:00
security	apparmor: Fix memory leak in unpack_profile()	2024-01-25 15:45:25 -08:00
sound	ALSA: aloop: Introduce a function to get if access is interleaved mode	2024-01-25 15:45:26 -08:00
tools	perf db-export: Fix missing reference count get in call_path_from_sample()	2024-01-25 15:45:25 -08:00
usr	arch: Remove Itanium (IA-64) architecture	2023-09-11 08:13:17 +00:00
virt	KVM/arm64 fixes for 6.7, part #2	2023-12-22 18:03:54 -05:00
.clang-format	iommu: Add for_each_group_device()	2023-05-23 08:15:51 +02:00
.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: 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 6.7.1	2024-01-20 11:53:02 +01:00
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.