On Tue, Mar 15, 2016 at 8:59 PM, Stefan Roese <s...@denx.de> wrote: > 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 <s...@denx.de> > Cc: Simon Glass <s...@chromium.org> > Acked-by: Hans de Goede <hdego...@redhat.com> > Tested-by: Stephen Warren <swar...@nvidia.com> > Cc: Marek Vasut <ma...@denx.de> > > --- > > Changes in v5: None > Changes in v4: > - Minor rewording / fixes of the commit text > - Add Acked-by from Hans > > Changes in v3: None > Changes in v2: > - Make this change unconditional > - Add Tested-by from Stephen > > common/usb.c | 13 +------------ > 1 file changed, 1 insertion(+), 12 deletions(-) >
Tested-by: Bin Meng <bmeng...@gmail.com> _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
