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| author | Eugene Korenevsky <ekorenevsky@astralinux.ru> | 2021-01-10 20:36:09 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-01-12 19:16:37 +0300 |
| commit | 280a9045bb18833db921b316a5527d2b565e9f2e (patch) | |
| tree | 3ba47c9fdf46093bd5ebde9908ed57acfa86ef06 /drivers/usb/host/ehci-tegra.c | |
| parent | 5f8e084026543bc06eb9b2a623de55bb4ab3e60e (diff) | |
| download | linux-280a9045bb18833db921b316a5527d2b565e9f2e.tar.xz | |
ehci: fix EHCI host controller initialization sequence
According to EHCI spec, EHCI HC clears USBSTS.HCHalted whenever
USBCMD.RS=1.
However, it is a good practice to wait some time after setting USBCMD.RS
(approximately 100ms) until USBSTS.HCHalted become zero.
Without this waiting, VirtualBox's EHCI virtual HC accidentally hangs
(see BugLink).
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=211095
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Eugene Korenevsky <ekorenevsky@astralinux.ru>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210110173609.GA17313@himera.home
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ehci-tegra.c')
0 files changed, 0 insertions, 0 deletions