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Rajasingh Thavamani b9e298f864 net: phy: Micrel KSZ8061: link failure after cable connect 
[ Upstream commit 232ba3a51c ]

With Micrel KSZ8061 PHY, the link may occasionally not come up after
Ethernet cable connect. The vendor's (Microchip, former Micrel) errata
sheet 80000688A.pdf descripes the problem and possible workarounds in
detail, see below.
The batch implements workaround 1, which permanently fixes the issue.

DESCRIPTION
Link-up may not occur properly when the Ethernet cable is initially
connected. This issue occurs more commonly when the cable is connected
slowly, but it may occur any time a cable is connected. This issue occurs
in the auto-negotiation circuit, and will not occur if auto-negotiation
is disabled (which requires that the two link partners be set to the
same speed and duplex).

END USER IMPLICATIONS
When this issue occurs, link is not established. Subsequent cable
plug/unplaug cycle will not correct the issue.

WORk AROUND
There are four approaches to work around this issue:
1. This issue can be prevented by setting bit 15 in MMD device address 1,
   register 2, prior to connecting the cable or prior to setting the
   Restart Auto-negotiation bit in register 0h. The MMD registers are
   accessed via the indirect access registers Dh and Eh, or via the Micrel
   EthUtil utility as shown here:
   . if using the EthUtil utility (usually with a Micrel KSZ8061
     Evaluation Board), type the following commands:
     > address 1
     > mmd 1
     > iw 2 b61a
   . Alternatively, write the following registers to write to the
     indirect MMD register:
     Write register Dh, data 0001h
     Write register Eh, data 0002h
     Write register Dh, data 4001h
     Write register Eh, data B61Ah
2. The issue can be avoided by disabling auto-negotiation in the KSZ8061,
   either by the strapping option, or by clearing bit 12 in register 0h.
   Care must be taken to ensure that the KSZ8061 and the link partner
   will link with the same speed and duplex. Note that the KSZ8061
   defaults to full-duplex when auto-negotiation is off, but other
   devices may default to half-duplex in the event of failed
   auto-negotiation.
3. The issue can be avoided by connecting the cable prior to powering-up
   or resetting the KSZ8061, and leaving it plugged in thereafter.
4. If the above measures are not taken and the problem occurs, link can
   be recovered by setting the Restart Auto-Negotiation bit in
   register 0h, or by resetting or power cycling the device. Reset may
   be either hardware reset or software reset (register 0h, bit 15).

PLAN
This errata will not be corrected in the future revision.

Fixes: 7ab59dc15e ("drivers/net/phy/micrel_phy: Add support for new PHYs")
Signed-off-by: Alexander Onnasch <alexander.onnasch@landisgyr.com>
Signed-off-by: Rajasingh Thavamani <T.Rajasingh@landisgyr.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-13 14:03:10 -07:00
arch x86/uaccess: Don't leak the AC flag into __put_user() value evaluation 2019-03-05 17:58:03 +01:00
block blk-mq: fix a hung issue when fsync 2019-02-20 10:20:44 +01:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto net: crypto set sk to NULL when af_alg_release. 2019-02-23 09:06:42 +01:00
Documentation dt-bindings: eeprom: at24: add "atmel,24c2048" compatible string 2019-02-20 10:20:44 +01:00
drivers net: phy: Micrel KSZ8061: link failure after cable connect 2019-03-13 14:03:10 -07:00
firmware License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fs writeback: synchronize sync(2) against cgroup writeback membership switches 2019-03-05 17:58:01 +01:00
include net: avoid use IPCB in cipso_v4_error 2019-03-13 14:03:09 -07:00
init init: rename and re-order boot_cpu_state_init() 2018-08-15 18:12:48 +02:00
ipc ipc/sem.c: prevent queue.status tearing in semop 2018-09-05 09:26:30 +02:00
kernel locking/rwsem: Fix (possible) missed wakeup 2019-03-05 17:58:00 +01:00
lib seq_buf: Make seq_buf_puts() null-terminate the buffer 2019-02-12 19:46:08 +01:00
mm mm: enforce min addr even if capable() in expand_downwards() 2019-03-05 17:58:02 +01:00
net mpls: Return error for RTA_GATEWAY attribute 2019-03-13 14:03:09 -07:00
samples samples: mei: use /dev/mei0 instead of /dev/mei 2019-02-15 08:09:12 +01:00
scripts scripts/gdb: fix lx-version string output 2019-02-12 19:46:10 +01:00
security KEYS: always initialize keyring_index_key::desc_len 2019-02-27 10:08:07 +01:00
sound ASoC: imx-audmux: change snprintf to scnprintf for possible overflow 2019-03-05 17:57:59 +01:00
tools selftests: gpio-mockup-chardev: Check asprintf() for error 2019-03-05 17:57:59 +01:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt kvm: fix kvm_ioctl_create_device() reference counting (CVE-2019-6974) 2019-02-12 19:46:13 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS MAINTAINERS: Add Sasha as a stable branch maintainer 2018-12-01 09:42:50 +01:00
Makefile Linux 4.14.105 2019-03-05 17:58:03 +01:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.