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Merge "usb: xhci: Support enabling of compliance mode for xhci 1.1"

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Linux Build Service Account 2019-05-08 18:49:37 -07:00 • committed by Gerrit - the friendly Code Review server
commit 64baae1cd9
1 changed files with 34 additions and 0 deletions
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34
drivers/usb/host/xhci-hub.c
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@ -1197,6 +1197,40 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
temp = readl(port_array[wIndex]); temp = readl(port_array[wIndex]);
break; break;
} }
/*
* For xHCI 1.1 according to section 4.19.1.2.4.1 a
* root hub port's transition to compliance mode upon
* detecting LFPS timeout may be controlled by an
* Compliance Transition Enabled (CTE) flag (not
* software visible). This flag is set by writing 0xA
* to PORTSC PLS field which will allow transition to
* compliance mode the next time LFPS timeout is
* encountered. A warm reset will clear it.
*
* The CTE flag is only supported if the HCCPARAMS2 CTC
* flag is set, otherwise, the compliance substate is
* automatically entered as on 1.0 and prior.
*/
if (link_state == USB_SS_PORT_LS_COMP_MOD) {
if (!HCC2_CTC(xhci->hcc_params2)) {
xhci_dbg(xhci, "CTC flag is 0, port already supports entering compliance mode\n");
break;
}
if ((temp & PORT_CONNECT)) {
xhci_warn(xhci, "Can't set compliance mode when port is connected\n");
goto error;
}
xhci_dbg(xhci, "Enable compliance mode transition for port %d\n",
wIndex);
xhci_set_link_state(xhci, port_array, wIndex,
link_state);
temp = readl(port_array[wIndex]);
break;
}
/* Port must be enabled */ /* Port must be enabled */
if (!(temp & PORT_PE)) { if (!(temp & PORT_PE)) {
retval = -ENODEV; retval = -ENODEV;