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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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05768918b9
It seems to be getting more common recently for EHCI host controllers to be probed after their companion UHCI or OHCI controllers. This may be caused partly by splitting the ehci-pci driver out from ehci-hcd, or it may be caused by changes in the way the kernel does driver probing. Regardless, it has a tendency to cause problems. When an EHCI controller is initialized, it takes ownership of all the ports away from the companions. In effect, it forcefully disconnects all the USB devices that may already be using a companion controller. This patch (as1672b) tries to make the transition more orderly by deconfiguring the root hubs for all the companion controllers before initializing the EHCI controller, and reconfiguring them afterward. The result is a soft disconnect rather than a hard one. Internally, the patch refactors the code involved in associating EHCI controllers with their companions. The old approach, in which a single function is called with an argument telling it what to do (the companion_action enum), has been replaced with a scheme using multiple callback functions, each performing a single task. This patch won't solve all the problems people encounter when their EHCI controllers start up, but it will at least reduce the number of error messages generated by the unexpected disconnections. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Jenya Y <jy.gerstmaier@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| .. | ||
| buffer.c | ||
| config.c | ||
| devices.c | ||
| devio.c | ||
| driver.c | ||
| endpoint.c | ||
| file.c | ||
| generic.c | ||
| hcd-pci.c | ||
| hcd.c | ||
| hub.c | ||
| hub.h | ||
| Kconfig | ||
| Makefile | ||
| message.c | ||
| notify.c | ||
| otg_whitelist.h | ||
| port.c | ||
| quirks.c | ||
| sysfs.c | ||
| urb.c | ||
| usb-acpi.c | ||
| usb.c | ||
| usb.h | ||