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USB: relax usbcore reset timings

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Following the corresponding Linux code, this patch relaxes reset timings
waiting at least 100ms after power to the ports. There are some reports
that it helps make enumeration work better on some high speed devices.
Furthermore, the wait is only done once after power has been enabled
on all ports.

CC: Remy Bohmer <linux@bohmer.net>
CC: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Wolfgang Grandegger <wg@denx.de>
This commit is contained in:
Wolfgang Grandegger 2011-12-21 00:01:09 +00:00 committed by Wolfgang Denk
parent f9636e8d38
commit a1a28c6e64
1 changed files with 4 additions and 1 deletions
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5
common/usb_hub.c
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@ -109,6 +109,7 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
{
int i;
struct usb_device *dev;
unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
dev = hub->pusb_dev;
/* Enable power to the ports */
@ -116,8 +117,10 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
for (i = 0; i < dev->maxchild; i++) {
usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
USB_HUB_PRINTF("port %d returns %lX\n", i + 1, dev->status);
wait_ms(hub->desc.bPwrOn2PwrGood * 2);
}
/* Wait at least 100 msec for power to become stable */
wait_ms(max(pgood_delay, (unsigned)100));
}
void usb_hub_reset(void)