6ccf50d4d4
Since commit 23d775f12dcd ("net: dsa: mv88e6xxx: Wait for EEPROM done
before HW reset") the following error is seen on a imx8mn board with
a 88E6320 switch:
mv88e6085 30be0000.ethernet-1:00: Timeout waiting for EEPROM done
This board does not have an EEPROM attached to the switch though.
This problem is well explained by Andrew Lunn:
"If there is an EEPROM, and the EEPROM contains a lot of data, it could
be that when we perform a hardware reset towards the end of probe, it
interrupts an I2C bus transaction, leaving the I2C bus in a bad state,
and future reads of the EEPROM do not work.
The work around for this was to poll the EEInt status and wait for it
to go true before performing the hardware reset.
However, we have discovered that for some boards which do not have an
EEPROM, EEInt never indicates complete. As a result,
mv88e6xxx_g1_wait_eeprom_done() spins for a second and then prints a
warning.
We probably need a different solution than calling
mv88e6xxx_g1_wait_eeprom_done(). The datasheet for 6352 documents the
EEPROM Command register:
bit 15 is:
EEPROM Unit Busy. This bit must be set to a one to start an EEPROM
operation (see EEOp below). Only one EEPROM operation can be
executing at one time so this bit must be zero before setting it to
a one. When the requested EEPROM operation completes this bit will
automatically be cleared to a zero. The transition of this bit from
a one to a zero can be used to generate an interrupt (the EEInt in
Global 1, offset 0x00).
and more interesting is bit 11:
Register Loader Running. This bit is set to one whenever the
register loader is busy executing instructions contained in the
EEPROM."
Change to using mv88e6xxx_g2_eeprom_wait() to fix the timeout error
when the EEPROM chip is not present.
Fixes: 23d775f12dcd ("net: dsa: mv88e6xxx: Wait for EEPROM done before HW reset")
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
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
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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.