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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2020-01-27 17:37:42 +0900
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-02-10 11:15:27 -0800
commitcc7eac1e4afdd151085be4d0341a155760388653 (patch)
tree54e2c6370b59183d71cd3313e5cc26c30679b33a /include/linux/usb
parentbb6d3fb354c5ee8d6bde2d576eb7220ea09862b9 (diff)
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.h2
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 */