[U-Boot] [PATCH 2/2] ehci-hcd.c, musb_core, usb.h: Add USB_DMA_MINALIGN define for cache alignment

Marek Vasut
2012-07-15T08:07:05Z

Dear Ilya Yanok,

> Hi,
>
> On Sun, Jul 8, 2012 at 7:08 AM, Marek Vasut <marex@denx.de> wrote:
> > @@ -207,8 +210,8 @@ static int
> >
> > ehci_submit_async(struct usb_device *dev, unsigned long pipe, void
> >
> > *buffer,
> >
> > int length, struct devrequest *req)
> >
> > {
> >
> > - static struct QH qh __attribute__((aligned(32)));
> > - static struct qTD qtd[3] __attribute__((aligned (32)));
> > + ALLOC_CACHE_ALIGN_BUFFER(struct QH, qh, 1);
>
> Somehow this doesn't work being allocated on stack... I assumed that this
> was declared as static just to use __attribute__((aligned))...

Not really ... but then, we have indeed a problem here. It was probably declared
static to preserve the contents of these variables across the the calls of this
function. Sigh, the USB code is really bloody :-/

Ilya, can you try pulling these out of the function?

> but it seems
> that current code doesn't like qh address being changed (I'm getting "Timed
> out on TD" messages). Any ideas? Changing it to DEFINE_... seems to help
> but it looks like hiding another bug.
>
> Regards, Ilya.

Best regards,
Marek Vasut