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>
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 @@
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 @@
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);
}