From: Stefan Roese Date: Tue, 15 Mar 2016 12:59:14 +0000 (+0100) Subject: usb: Don't reset the USB hub a 2nd time X-Git-Tag: v2016.05-rc1~237 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=3ed9eb93c2c7d8e09ac0b5a047f58c3aae201516;p=u-boot usb: Don't reset the USB hub a 2nd time Debugging has shown, that all USB hubs are being reset twice while USB scanning. This introduces additional delays and makes USB scanning even more slow. Testing has shown that this 2nd USB hub reset doesn't seem to be necessary. This patch now removes this 2nd USB hub reset. Resulting in faster USB scan time. Here the current numbers: Without this patch: => time usb start starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 24.003 seconds With this patch: => time usb start starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.392 seconds So ~3.6 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese Cc: Simon Glass Acked-by: Hans de Goede Tested-by: Stephen Warren Cc: Marek Vasut --- diff --git a/common/usb.c b/common/usb.c index c7b8b0ee5a..45a5a0f9c7 100644 --- a/common/usb.c +++ b/common/usb.c @@ -919,19 +919,8 @@ __weak int usb_alloc_device(struct usb_device *udev) static int usb_hub_port_reset(struct usb_device *dev, struct usb_device *hub) { - if (hub) { - unsigned short portstatus; - int err; - - /* reset the port for the second time */ - err = legacy_hub_port_reset(hub, dev->portnr - 1, &portstatus); - if (err < 0) { - printf("\n Couldn't reset port %i\n", dev->portnr); - return err; - } - } else { + if (!hub) usb_reset_root_port(dev); - } return 0; }