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| author |   Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2020-01-27 17:37:42 +0900 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-10 11:15:27 -0800 |
| commit | cc7eac1e4afdd151085be4d0341a155760388653 (patch) | |
| tree | 54e2c6370b59183d71cd3313e5cc26c30679b33a /include/linux/usb | |
| parent | Linux 5.6-rc1 (diff) | |
| download | linux-dev-cc7eac1e4afdd151085be4d0341a155760388653.tar.xz linux-dev-cc7eac1e4afdd151085be4d0341a155760388653.zip | |
usb: host: ehci-platform: add a quirk to avoid stuck
Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to
be getting stuck very rarely after a full/low usb device was
disconnected. To detect/recover from such a situation, the controllers
require a special way which poll the EHCI PORTSC register and changes
the OHCI functional state.
So, this patch adds a polling timer into the ehci-platform driver,
and if the ehci driver detects the issue by the EHCI PORTSC register,
the ehci driver removes a companion device (= the OHCI controller)
to change the OHCI functional state to USB Reset once. And then,
the ehci driver adds the companion device again.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/1580114262-25029-1-git-send-email-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb')
| -rw-r--r-- | include/linux/usb/ehci_def.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/usb/ehci_def.h b/include/linux/usb/ehci_def.h index a15ce99dfc2d..78e006355557 100644 --- a/include/linux/usb/ehci_def.h +++ b/include/linux/usb/ehci_def.h @@ -151,7 +151,7 @@ struct ehci_regs { #define PORT_OWNER (1<<13) /* true: companion hc owns this port */ #define PORT_POWER (1<<12) /* true: has power (see PPC) */ #define PORT_USB11(x) (((x)&(3<<10)) == (1<<10)) /* USB 1.1 device */ -/* 11:10 for detecting lowspeed devices (reset vs release ownership) */ +#define PORT_LS_MASK (3<<10) /* Link status (SE0, K or J */ /* 9 reserved */ #define PORT_LPM (1<<9) /* LPM transaction */ #define PORT_RESET (1<<8) /* reset port */ |