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[ Upstream commit b77d2a0a223bc139ee8904991b2922d215d02636 ] Some integrated OHCI controller hubs do not expose all ports of the hub to pins on the SoC. In some cases the unconnected ports generate spurious over-current events. For example the Broadcom 56060/Ranger 2 SoC contains a nominally 3 port hub but only the first port is wired. Default behaviour for ohci-platform driver is to use global over-current protection mode (AKA "ganged"). This leads to the spurious over-current events affecting all ports in the hub. We now alter the default to use per-port over-current protection. This patch results in the following configuration changes depending on quirks: - For quirk OHCI_QUIRK_SUPERIO no changes. These systems remain set up for ganged power switching and no over-current protection. - For quirk OHCI_QUIRK_AMD756 or OHCI_QUIRK_HUB_POWER power switching remains at none, while over-current protection is now guaranteed to be set to per-port rather than the previous behaviour where it was either none or global over-current protection depending on the value at function entry. Suggested-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Hamish Martin <hamish.martin@alliedtelesis.co.nz> Link: https://lore.kernel.org/r/20200910212512.16670-1-hamish.martin@alliedtelesis.co.nz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 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.