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authorVivek Gautam <gautam.vivek@samsung.com>2013-04-24 02:50:11 +0000
committerMarek Vasut <marex@denx.de>2013-05-06 02:16:36 +0200
commit0bf796f7ae22086f0504f3297e9fb4e96aa04161 (patch)
treeda2687cedbb27541feddf631b54ab3f1951614eb
parent158947d276c96a49e0a99a97a61605be1bb5eb7a (diff)
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usb: hub: Parallelize power-cycling of root-hub ports
Untill now we power-cycle (aka: disable power on a port and re-enabling again) one port at a time. Delay of 20ms for Port-power to change multiplies with number of ports in this case. So better we parallelize this process: disable power on all ports, wait for port-power to stabilize and then re-enable the power subsequently. Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
-rw-r--r--common/usb_hub.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/common/usb_hub.c b/common/usb_hub.c
index 1e225e6..4fbfacf 100644
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -105,19 +105,22 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
int ret;
dev = hub->pusb_dev;
- /* Enable power to the ports */
+
+ /*
+ * 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++) {
- /*
- * Power-cycle the ports here: aka,
- * turning them off and turning on again.
- */
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);
+ /* 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);
@@ -138,7 +141,9 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
debug("port %d: Port power change failed\n", i + 1);
return;
}
+ }
+ 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);
}