usb: hub: Power-cycle on root-hub ports
XHCI ports are powered on after a H/W reset, however EHCI ports are not. So disabling and re-enabling power on all ports invariably. Signed-off-by: Amar <amarendra.xt@samsung.com> Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
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@ -100,11 +100,45 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
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int i;
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int i;
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struct usb_device *dev;
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struct usb_device *dev;
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unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
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unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
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ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
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unsigned short portstatus;
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int ret;
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dev = hub->pusb_dev;
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dev = hub->pusb_dev;
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/* Enable power to the ports */
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/* Enable power to the ports */
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debug("enabling power on all ports\n");
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debug("enabling power on all ports\n");
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for (i = 0; i < dev->maxchild; i++) {
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for (i = 0; i < dev->maxchild; i++) {
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/*
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* Power-cycle the ports here: aka,
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* turning them off and turning on again.
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*/
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usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
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debug("port %d returns %lX\n", i + 1, dev->status);
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/* Wait at least 2*bPwrOn2PwrGood for PP to change */
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mdelay(pgood_delay);
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ret = usb_get_port_status(dev, i + 1, portsts);
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if (ret < 0) {
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debug("port %d: get_port_status failed\n", i + 1);
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return;
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}
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/*
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* Check to confirm the state of Port Power:
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* xHCI says "After modifying PP, s/w shall read
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* PP and confirm that it has reached the desired state
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* before modifying it again, undefined behavior may occur
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* if this procedure is not followed".
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* EHCI doesn't say anything like this, but no harm in keeping
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* this.
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*/
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portstatus = le16_to_cpu(portsts->wPortStatus);
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if (portstatus & (USB_PORT_STAT_POWER << 1)) {
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debug("port %d: Port power change failed\n", i + 1);
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return;
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}
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usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
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usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
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debug("port %d returns %lX\n", i + 1, dev->status);
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debug("port %d returns %lX\n", i + 1, dev->status);
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}
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}
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