[U-Boot] [PATCH 3/4 V2] USB: Drop cache flush bloat in EHCI-HCD

[Anatolij Gustschin]

Hi Marek,

On Mon,  9 Apr 2012 06:47:31 +0200
Marek Vasut <marex at denx.de> wrote:

> Discard the creepy cache flushing mechanisms in ehci-hcd.c and replace them with
> more straightforward flushing. In the new approach, the flushing takes place
> directly in ehci_submit_async() call instead of going through the QH list and
> flushing all members and buffers. This discards a lot of weird bit operations
> on the members of QH and qTD structures.
> 
> NOTE: Certainly, this flushes even qTDs which are possibly unused in some
> transactions, though the overhead of the previous code was much higher than is
> the overhead of flushing two more cache lines (which most probably aren't even
> cached).
> 
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Puneet Saxena <puneets at nvidia.com>
> ---
>  drivers/usb/host/ehci-hcd.c |  127 +++++++++----------------------------------
>  1 files changed, 27 insertions(+), 100 deletions(-)

Unfortunately this patch breaks compiling for many powerpc boards, mpc512x,
mpc83xx, mpc85xx and QorIQ Px based with USB support enabled.

Thanks,
Anatolij