[U-Boot] [PATCH v5] usb: align buffers at cacheline

[Marek Vasut <marex@denx.de>]

Dear Eric Nelson,

> On 03/05/2012 12:16 AM, Puneet Saxena wrote:
> > As DMA expects the buffers to be equal and larger then
> > cache lines, This aligns buffers at cacheline.
> > 
> > Signed-off-by: Puneet Saxena<puneets@nvidia.com>
> > ---
> > 
> > Changes for V4:
> >      - Added memcpy to copy local descriptor to global descriptor.
> >      
> >        Without that, USB version, class, vendor, product Id...etc is not
> >        configured. This information is useful for loading correct device
> >        driver and possible configuration.
> > 
> > Changes for V5:
> >      - Aligned "usb_device_descriptor" using ARCH_DMA_MINALIGN
> >   
> >   common/cmd_usb.c            |    3 +-
> >   common/usb.c                |   54
> >   ++++++++++++++++++++++----------------- common/usb_storage.c        | 
> >    59 ++++++++++++++++++++---------------------- disk/part_dos.c        
> >       |    2 +-
> >   drivers/usb/host/ehci-hcd.c |    8 ++++++
> >   include/scsi.h              |    4 ++-
> >   include/usb.h               |    6 +++-
> >   7 files changed, 76 insertions(+), 60 deletions(-)
> > 
> > diff --git a/common/cmd_usb.c b/common/cmd_usb.c
> > index 320667f..bca9d94 100644
> > --- a/common/cmd_usb.c
> > +++ b/common/cmd_usb.c
> > @@ -150,7 +150,8 @@ void usb_display_class_sub(unsigned char dclass,
> > unsigned char subclass,
> > 
> >   void usb_display_string(struct usb_device *dev, int index)
> >   {
> > 
> > -	char buffer[256];
> > +	ALLOC_CACHE_ALIGN_BUFFER(char, buffer, 256);
> > +
> > 
> >   	if (index != 0) {
> >   	
> >   		if (usb_string(dev, index,&buffer[0], 256)>  0)
> >   		
> >   			printf("String: \"%s\"", buffer);
> > 
> > diff --git a/common/usb.c b/common/usb.c
> > index 6e21ae2..3005012 100644
> > --- a/common/usb.c
> > +++ b/common/usb.c
> > @@ -73,7 +73,6 @@ static struct usb_device usb_dev[USB_MAX_DEVICE];
> > 
> >   static int dev_index;
> >   static int running;
> >   static int asynch_allowed;
> > 
> > -static struct devrequest setup_packet;
> > 
> >   char usb_started; /* flag for the started/stopped USB status */
> > 
> > @@ -185,23 +184,25 @@ int usb_control_msg(struct usb_device *dev,
> > unsigned int pipe,
> > 
> >   			unsigned short value, unsigned short index,
> >   			void *data, unsigned short size, int timeout)
> >   
> >   {
> > 
> > +	ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet,
> > +		sizeof(struct devrequest));
> 
> sizeof(struct devrequest) should be 1, right?
> 
> See comment for usage:
> 	http://git.denx.de/?p=u-
boot.git;a=blob;f=include/common.h;h=a2c6b27d43cce
> 33d1a00a033e4b33c895c4e1d8d;hb=HEAD#l904

Oh! Nice catch :)

Best regards,
Marek Vasut