On Tue, 13 Oct 2015 04:04:28 +0200 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx> wrote: > On 19:52 Wed 07 Oct , Peter Mamonov wrote: > > On Wed, 7 Oct 2015 17:40:24 +0200 > > Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx> wrote: > > > > > On 17:40 Wed 07 Oct , Peter Mamonov wrote: > > > > On Wed, 7 Oct 2015 15:47:03 +0200 > > > > Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx> wrote: > > > > > > > > > On 18:58 Tue 22 Sep , Peter Mamonov wrote: > > > > > > Signed-off-by: Peter Mamonov <pmamonov@xxxxxxxxx> > > > > > > --- > > > > > > drivers/usb/host/ehci-hcd.c | 6 +++--- > > > > > > 1 file changed, 3 insertions(+), 3 deletions(-) > > > > > > > > > > > > diff --git a/drivers/usb/host/ehci-hcd.c > > > > > > b/drivers/usb/host/ehci-hcd.c index d6df7b8..03d6150 100644 > > > > > > --- a/drivers/usb/host/ehci-hcd.c > > > > > > +++ b/drivers/usb/host/ehci-hcd.c > > > > > > @@ -684,7 +684,7 @@ ehci_submit_root(struct usb_device *dev, > > > > > > unsigned long pipe, void *buffer, > > > > > > * root > > > > > > */ > > > > > > ehci_powerup_fixup(ehci); > > > > > > - mdelay(50); > > > > > > + mdelay_non_interruptible(50); > > > > > > ehci->portreset |= 1 << port; > > > > > > /* terminate the reset */ > > > > > > ehci_writel(status_reg, reg & > > > > > > ~EHCI_PS_PR); @@ -747,7 +747,7 @@ ehci_submit_root(struct > > > > > > usb_device *dev, unsigned long pipe, void *buffer, goto unknown; > > > > > > } > > > > > > > > > > > > - mdelay(1); > > > > > > + mdelay_non_interruptible(1); > > > > > > len = min3(srclen, (int)le16_to_cpu(req->length), > > > > > > length); if (srcptr != NULL && len > 0) > > > > > > memcpy(buffer, srcptr, len); > > > > > > @@ -889,7 +889,7 @@ static int ehci_init(struct usb_host *host) > > > > > > ehci_writel(&ehci->hcor->or_configflag, cmd); > > > > > > /* unblock posted write */ > > > > > > cmd = ehci_readl(&ehci->hcor->or_usbcmd); > > > > > > - mdelay(5); > > > > > > + mdelay_non_interruptible(5); > > > > > why do you need that much non interruptible delau? > > > > > > > > Non-interruptible delays are needed here to prevent ehci_* functions > > > > re-entrance. The re-entrance occurs during a usb bus scan, after > > > > detection of a usb keyboard. As soon as a USB keyboard is detected, > > > > it's driver starts the poller, which interferes with the process of > > > > usb bus scan. However that last one delay may be interruptible. > > > > > > my problem is as soon as you start a usb control msg you block > > > everything > > > > > > nothing else can run in barebox > > > > > > can slow down barebox boot > > > > > > I do think we need a real mdelay_non_interruptible feature but just > > > forbidden to recall usb control msg. > > > But the rest of barebox can run durring those 5ms > > > > Well, I think it can be done by returning -EAGAIN on re-entrance > > detection in ehci_* functions [1], and skipping the poll in the keyboard > > driver. > > > > By the way, could you clarify: do you really experience > > considerable barebox slowdown or you make an assumtion based on the > > code analysis? > > I've wrote similar code for barebox nearly 1 year ago and did notice it So you have not tested Peter's code. Could you please test latest next branch and sand a word on slowdown? > Best Regards, > J. > > > > [1] > > http://lists.infradead.org/pipermail/barebox/2015-September/024715.html > > > > Regards, > > Peter > > > > > > > > Best Regards, > > > J. > > > > _______________________________________________ > barebox mailing list > barebox@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/barebox -- -- Best regards, Antony Pavlov _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
