From: Andiry Xu <andiry.xu@xxxxxxx> xHCI 1.0 specification indicates that software should set Average TRB Length to '8' for control endpoints. Signed-off-by: Andiry Xu <andiry.xu@xxxxxxx> Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> --- drivers/usb/host/xhci-mem.c | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-) diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index a4fc4d9..543833b 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -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; -- 1.7.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
