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| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2018-09-20 19:13:37 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-28 15:04:45 +0200 |
| commit | f8f80be501aa2f10669585c3e328fad079d8cb3a (patch) | |
| tree | 6ac1f3f37e5bee6f359519d2ed1978c58a69cecc /drivers/usb/host/xhci.h | |
| parent | c94d41e9dd1ba3f95ca958ff04adeb64e3d6a9be (diff) | |
| download | linux-stable-f8f80be501aa2f10669585c3e328fad079d8cb3a.tar.gz | |
xhci: Use soft retry to recover faster from transaction errors
Use soft retry to recover from a USB Transaction Errors that are caused by
temporary error conditions. The USB device is not aware that the xHC
has halted the endpoint, and will be waiting for another retry
A Soft Retry perform additional retries and recover from an error which has
caused the xHC to halt an endpoint.
Soft retry has some limitations:
Soft Retry attempts shall not be performed on Isoch endpoints
Soft Retry attempts shall not be performed if the device is behind a TT in
a HS Hub
Software shall limit the number of unsuccessful Soft Retry attempts to
prevent an infinite loop.
For more details on Soft retry see xhci specs 4.6.8.1
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci.h')
| -rw-r--r-- | drivers/usb/host/xhci.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 6230a578324c..b63578548bef 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1496,6 +1496,7 @@ static inline const char *xhci_trb_type_string(u8 type) /* How much data is left before the 64KB boundary? */ #define TRB_BUFF_LEN_UP_TO_BOUNDARY(addr) (TRB_MAX_BUFF_SIZE - \ (addr & (TRB_MAX_BUFF_SIZE - 1))) +#define MAX_SOFT_RETRY 3 struct xhci_segment { union xhci_trb *trbs; @@ -1583,6 +1584,7 @@ struct xhci_ring { * if we own the TRB (if we are the consumer). See section 4.9.1. */ u32 cycle_state; + unsigned int err_count; unsigned int stream_id; unsigned int num_segs; unsigned int num_trbs_free; |