diff options
| author | Vivek Gautam <gautam.vivek@samsung.com> | 2013-04-24 02:50:11 +0000 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2013-05-06 02:16:36 +0200 |
| commit | 0bf796f7ae22086f0504f3297e9fb4e96aa04161 (patch) | |
| tree | da2687cedbb27541feddf631b54ab3f1951614eb /common | |
| parent | 158947d276c96a49e0a99a97a61605be1bb5eb7a (diff) | |
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>
Diffstat (limited to 'common')
| -rw-r--r-- | common/usb_hub.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/common/usb_hub.c b/common/usb_hub.c index 1e225e6b37..4fbfacf249 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); } |