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| author | Stefan Roese <sr@denx.de> | 2016-03-15 13:59:14 +0100 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2016-03-20 18:00:45 +0100 |
| commit | 3ed9eb93c2c7d8e09ac0b5a047f58c3aae201516 (patch) | |
| tree | f4ef07d1f4320cefe706625674cc8ed63ecffbfd /common/usb.c | |
| parent | 2ef117fe4fce4e1af282ac2bbb0be36c41d15e2b (diff) | |
| download | u-boot-3ed9eb93c2c7d8e09ac0b5a047f58c3aae201516.tar.gz u-boot-3ed9eb93c2c7d8e09ac0b5a047f58c3aae201516.tar.bz2 u-boot-3ed9eb93c2c7d8e09ac0b5a047f58c3aae201516.zip | |
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 <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Cc: Marek Vasut <marex@denx.de>
Diffstat (limited to 'common/usb.c')
| -rw-r--r-- | common/usb.c | 13 |
1 files changed, 1 insertions, 12 deletions
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; } |