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xHCI 1.0: Control endpoint average TRB length field set

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xHCI 1.0 specification indicates that software should set Average TRB Length
to '8' for control endpoints.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Andiry Xu 2011-05-05 18:13:58 +08:00 committed by Sarah Sharp
parent b83cdc8f4d
commit 51eb01a746
1 changed files with 8 additions and 1 deletions
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9
drivers/usb/host/xhci-mem.c
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@ -1246,8 +1246,15 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
* including link TRBs, No-op TRBs, and Event data TRBs. Since we don't
* use Event Data TRBs, and we don't chain in a link TRB on short
* transfers, we're basically dividing by 1.
*
* xHCI 1.0 specification indicates that the Average TRB Length should
* be set to 8 for control endpoints.
*/
ep_ctx->tx_info |= cpu_to_le32(AVG_TRB_LENGTH_FOR_EP(max_esit_payload));
if (usb_endpoint_xfer_control(&ep->desc) && xhci->hci_version == 0x100)
ep_ctx->tx_info |= cpu_to_le32(AVG_TRB_LENGTH_FOR_EP(8));
else
ep_ctx->tx_info |=
cpu_to_le32(AVG_TRB_LENGTH_FOR_EP(max_esit_payload));
/* FIXME Debug endpoint context */
return 0;