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USB: make usb_kbd obey USB DMA alignment requirements

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Change usb_kbd driver to obey alignment requirements for USB DMA on
the buffer used for data transfer.  This is necessary for
architectures that enable dcache and enable USB DMA.

Signed-off-by: Allen Martin <amartin@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Allen Martin 2012-10-24 08:32:04 +00:00 • committed by Marek Vasut
parent c11ace6b7b
commit d7475386bb
1 changed files with 4 additions and 1 deletions
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5
common/usb_kbd.c
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@ -112,7 +112,7 @@ struct usb_kbd_pdata {
uint32_t usb_out_pointer;
uint8_t usb_kbd_buffer[USB_KBD_BUFFER_LEN];
uint8_t new[8];
uint8_t *new;
uint8_t old[8];
uint8_t flags;
@ -435,6 +435,9 @@ static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
/* Clear private data */
memset(data, 0, sizeof(struct usb_kbd_pdata));
/* allocate input buffer aligned and sized to USB DMA alignment */
data->new = memalign(USB_DMA_MINALIGN, roundup(8, USB_DMA_MINALIGN));
/* Insert private data into USB device structure */
dev->privptr = data;