Merge branch 'master' of git://git.denx.de/u-boot-arm

[karo-tx-uboot.git] / common / usb_hub.c

diff --git a/common/usb_hub.c b/common/usb_hub.c
index 2add4b97920fefedbad4d2cd04b888d294992841..0f1eab448649541a45e674bcfbd599460cc89677 100644 (file)
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -86,49 +86,10 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
        int i;
        struct usb_device *dev;
        unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
-       ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
-       unsigned short portstatus;
-       int ret;
 
        dev = hub->pusb_dev;
 
-       /*
-        * Enable power to the ports:
-        * Here we Power-cycle the ports: aka,
-        * turning them off and turning on again.
-        */
        debug("enabling power on all ports\n");
-       for (i = 0; i < dev->maxchild; i++) {
-               usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
-               debug("port %d returns %lX\n", i + 1, dev->status);
-       }
-
-       /* Wait at least 2*bPwrOn2PwrGood for PP to change */
-       mdelay(pgood_delay);
-
-       for (i = 0; i < dev->maxchild; i++) {
-               ret = usb_get_port_status(dev, i + 1, portsts);
-               if (ret < 0) {
-                       debug("port %d: get_port_status failed\n", i + 1);
-                       continue;
-               }
-
-               /*
-                * Check to confirm the state of Port Power:
-                * xHCI says "After modifying PP, s/w shall read
-                * PP and confirm that it has reached the desired state
-                * before modifying it again, undefined behavior may occur
-                * if this procedure is not followed".
-                * EHCI doesn't say anything like this, but no harm in keeping
-                * this.
-                */
-               portstatus = le16_to_cpu(portsts->wPortStatus);
-               if (portstatus & (USB_PORT_STAT_POWER << 1)) {
-                       debug("port %d: Port power change failed\n", i + 1);
-                       continue;
-               }
-       }
-
        for (i = 0; i < dev->maxchild; i++) {
                usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
                debug("port %d returns %lX\n", i + 1, dev->status);
@@ -209,9 +170,22 @@ int hub_port_reset(struct usb_device *dev, int port,
                      (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
                      (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
 
-               if ((portchange & USB_PORT_STAT_C_CONNECTION) ||
-                   !(portstatus & USB_PORT_STAT_CONNECTION))
-                       return -1;
+               /*
+                * Perhaps we should check for the following here:
+                * - C_CONNECTION hasn't been set.
+                * - CONNECTION is still set.
+                *
+                * Doing so would ensure that the device is still connected
+                * to the bus, and hasn't been unplugged or replaced while the
+                * USB bus reset was going on.
+                *
+                * However, if we do that, then (at least) a San Disk Ultra
+                * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
+                * Tegra Jetson TK1 board. For some reason, the device appears
+                * to briefly drop off the bus when this second bus reset is
+                * executed, yet if we retry this loop, it'll eventually come
+                * back after another reset or two.
+                */
 
                if (portstatus & USB_PORT_STAT_ENABLE)
                        break;