diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2017-09-18 06:40:50 -0700 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2017-10-01 16:32:55 +0200 |
| commit | fae35857e1c38776854442f59d6b56c17e93fc39 (patch) | |
| tree | f0933df6d43620dff9251ce337ba7140cf5c1d6e /drivers/usb/host/xhci.c | |
| parent | ab2b727dc03113fe35d6a9c937911055be3d3990 (diff) | |
usb: xhci: Set 'Average TRB Length' to 8 for control endpoints
Update the codes to conform with xHCI spec chapter 6.2.3.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -rw-r--r-- | drivers/usb/host/xhci.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 93737b083c..4673738d1e 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -601,6 +601,12 @@ static int xhci_set_configuration(struct usb_device *udev) ep_ctx[ep_index]->deq = cpu_to_le64(trb_64 | virt_dev->eps[ep_index].ring->cycle_state); + /* + * xHCI spec 6.2.3: + * 'Average TRB Length' should be 8 for control endpoints. + */ + if (usb_endpoint_xfer_control(endpt_desc)) + avg_trb_len = 8; ep_ctx[ep_index]->tx_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_LO(max_esit_payload) | EP_AVG_TRB_LENGTH(avg_trb_len)); |