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Claudiu Beznea cb183a586e 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>		2024-01-25 15:27:49 -08:00
arch	s390/pci: fix max size calculation in zpci_memcpy_toio()	2024-01-25 15:27:49 -08:00
block	block: add check that partition length needs to be aligned with block size	2024-01-25 15:27:42 -08:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-02-09 11:28:11 +01:00
crypto	crypto: scomp - fix req->dst buffer overflow	2024-01-25 15:27:23 -08:00
Documentation	PCI/P2PDMA: Remove reference to pci_p2pdma_map_sg()	2024-01-25 15:27:44 -08:00
drivers	net: phy: micrel: populate .soft_reset for KSZ9131	2024-01-25 15:27:49 -08:00
fs	ksmbd: only v2 leases handle the directory	2024-01-25 15:27:41 -08:00
include	iio: adc: ad9467: fix scale setting	2024-01-25 15:27:47 -08:00
init	rootfs: Fix support for rootfstype= when root= is given	2024-01-25 15:27:43 -08:00
io_uring	io_uring/rw: ensure io->bytes_done is always initialized	2024-01-25 15:27:41 -08:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	bpf: Fix re-attachment branch in bpf_tracing_prog_attach	2024-01-25 15:27:43 -08:00
lib	kunit: debugfs: Fix unchecked dereference in debugfs_print_results()	2024-01-25 15:27:21 -08:00
LICENSES
mm	mm: fix unmap_mapping_range high bits shift bug	2024-01-10 17:10:35 +01:00
net	Revert "net: rtnetlink: Enslave device before bringing it up"	2024-01-25 15:27:43 -08:00
rust	rust: allocator: Prevent mis-aligned allocation	2023-08-11 12:08:18 +02:00
samples	fprobe: Pass entry_data to handlers	2023-10-25 12:03:12 +02:00
scripts	powerpc: remove checks for binutils older than 2.25	2024-01-25 15:27:18 -08:00
security	apparmor: avoid crash when parsed profile name is empty	2024-01-25 15:27:48 -08:00
sound	ASoC: mediatek: sof-common: Add NULL check for normal_link string	2024-01-25 15:27:48 -08:00
tools	perf env: Avoid recursively taking env->bpf_progs.lock	2024-01-25 15:27:48 -08:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add()	2023-09-13 09:42:46 +02:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING
CREDITS	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig
MAINTAINERS	genirq/affinity: Move group_cpus_evenly() into lib/	2024-01-10 17:10:33 +01:00
Makefile	Linux 6.1.74	2024-01-20 11:50:11 +01:00
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