On Tue, Mar 15, 2016 at 8:59 PM, Stefan Roese sr@denx.de wrote:
This patch removes 2 mdelay(200) calls from usb_hub_port_connect_change(). These delays don't seem to be necessary. At least not in my tests. Here the number for a custom x86 Bay Trail board (not in mainline yet) with a quite large and complex USB hub infrastructure.
Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found
time: 28.415 seconds
With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found
time: 24.003 seconds
So ~4.5 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
Changes in v5: None Changes in v4:
- Add Acked-by / Tested-by from Hans and Stephen
Changes in v3: None Changes in v2:
- Make this change unconditional
- Add Acked-by / Tested-by from Hans and Stephen
common/usb_hub.c | 3 --- 1 file changed, 3 deletions(-)
Tested-by: Bin Meng bmeng.cn@gmail.com