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| author |   Jim Lin <jilin@nvidia.com> | 2019-06-03 18:53:44 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-05 11:54:38 +0200 |
| commit | ef513be0a9057cc6baf5d29566aaaefa214ba344 (patch) | |
| tree | fca99456e1b1c5035288bd1cae7b7212b0bf0a90 /drivers/usb/host/xhci.h | |
| parent | usb: Add devaddr in struct usb_device (diff) | |
| download | linux-dev-ef513be0a9057cc6baf5d29566aaaefa214ba344.tar.xz linux-dev-ef513be0a9057cc6baf5d29566aaaefa214ba344.zip | |
usb: xhci: Add Clear_TT_Buffer
USB 2.0 specification chapter 11.17.5 says "as part of endpoint halt
processing for full-/low-speed endpoints connected via a TT, the host
software must use the Clear_TT_Buffer request to the TT to ensure
that the buffer is not in the busy state".
In our case, a full-speed speaker (ConferenceCam) is behind a high-
speed hub (ConferenceCam Connect), sometimes once we get STALL on a
request we may continue to get STALL with the folllowing requests,
like Set_Interface.
Here we invoke usb_hub_clear_tt_buffer() to send Clear_TT_Buffer
request to the hub of the device for the following Set_Interface
requests to the device to get ACK successfully.
Signed-off-by: Jim Lin <jilin@nvidia.com>
Acked-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 | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 7f8b950d1a73..34789f4db555 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -936,6 +936,8 @@ struct xhci_virt_ep { #define EP_GETTING_NO_STREAMS (1 << 5) #define EP_HARD_CLEAR_TOGGLE (1 << 6) #define EP_SOFT_CLEAR_TOGGLE (1 << 7) +/* usb_hub_clear_tt_buffer is in progress */ +#define EP_CLEARING_TT (1 << 8) /* ---- Related to URB cancellation ---- */ struct list_head cancelled_td_list; /* Watchdog timer for stop endpoint command to cancel URBs */ @@ -2102,6 +2104,9 @@ void xhci_handle_command_timeout(struct work_struct *work); void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index, unsigned int stream_id); +void xhci_ring_doorbell_for_active_rings(struct xhci_hcd *xhci, + unsigned int slot_id, + unsigned int ep_index); void xhci_cleanup_command_queue(struct xhci_hcd *xhci); void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring); unsigned int count_trbs(u64 addr, u64 len); |