The HCD_BOUNCE_BUFFERS USB host controller driver flag can be enabled
to instruct the USB stack to always bounce USB buffers to/from coherent
memory buffers _just_ before/after a host controller transmission.
This setting allows overcoming some platform-specific limitations.
For example, the Nint
On Wed, Feb 03, 2010 at 07:30:39PM +0100, Albert Herranz wrote:
> +/**
> + * hcd_memcpy32_to_coherent - copy data to a bounce buffer
> + * @dst: destination dma bounce buffer
> + * @src: source buffer
> + * @len: number of bytes to copy
> + *
> + * This function copies @len bytes from @src to @dst
On Wed, 3 Feb 2010, Albert Herranz wrote:
> The HCD_BOUNCE_BUFFERS USB host controller driver flag can be enabled
> to instruct the USB stack to always bounce USB buffers to/from coherent
> memory buffers _just_ before/after a host controller transmission.
>
> This setting allows overcoming some
Hi Alan,
Alan Stern wrote:
> This description sounds hopelessly confused. Maybe you're just
> misusing the term "coherent". The patch itself doesn't affect the
> coherent DMA mappings anyway; it affects the streaming mappings. Or to
> put it another way, what's the justification for replacing a
On Thu, 4 Feb 2010, Albert Herranz wrote:
> Hi Alan,
>
> Alan Stern wrote:
> > This description sounds hopelessly confused. Maybe you're just
> > misusing the term "coherent". The patch itself doesn't affect the
> > coherent DMA mappings anyway; it affects the streaming mappings. Or to
> > put
Alan Stern wrote:
>On a 64-bit processor, some of the accesses will be 64 bits wide
>instead of 32. Does that matter for your purposes?
>
The wii uses a 32-bit processor, so this is safe in this case.
>What about ohci-hcd and uhci-hcd? They both use non-32-bit accesses to
>structures in cohere
On Sun, 7 Feb 2010, Albert Herranz wrote:
> The wii has no uhci, but has 2 ohci controllers.
> For ohci we need a similar approach as done for ehci.
So you'll need to write a patch splitting up the OHCI data structures
in the same way the EHCI qh was split up.
> >If you do it as described above
Alan Stern wrote:
> On Sun, 7 Feb 2010, Albert Herranz wrote:
>
>> The wii has no uhci, but has 2 ohci controllers.
>> For ohci we need a similar approach as done for ehci.
>
> So you'll need to write a patch splitting up the OHCI data structures
> in the same way the EHCI qh was split up.
>
Y
