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[ Upstream commit b95e86d846b63b02ecdc94802ddbeaf9005fb6d9 ] We currently match clause 45 PHYs using any ID read from a MMD marked as present in the "Devices in package" registers 5 and 6. However, this is incorrect. 45.2 says: "The definition of the term package is vendor specific and could be a chip, module, or other similar entity." so a package could be more or less than the whole PHY - a PHY could be made up of several modules instantiated onto a single chip such as the Marvell 88x3310, or some of the MMDs could be disabled according to chip configuration, such as the Broadcom 84881. In the case of Broadcom 84881, the "Devices in package" registers contain 0xc000009b, meaning that there is a PHYXS present in the package, but all registers in MMD 4 return 0xffff. This leads to our matching code incorrectly binding this PHY to one of our generic PHY drivers. This patch changes the way we determine whether to attempt to match a MMD identifier, or use it to request a module - if the identifier is all-ones, then we skip over it. When reading the identifiers, we initialise phydev->c45_ids.device_ids to all-ones, only reading the device ID if the "Devices in package" registers indicates we should. This avoids the generic drivers incorrectly matching on a PHY ID of 0xffffffff. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.