[U-Boot] [PATCH v4 1/3] USB: make usb_kbd obey USB DMA alignment requirements

[Allen Martin]

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 at nvidia.com>
---
v4: dynamically allocate xfer buffer, add alignment and roundup to buffer
    instead of entire pdata struct
v3: add comment about alignemnt requirement
v2: use memalign instead of __align()
---
 common/usb_kbd.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/common/usb_kbd.c b/common/usb_kbd.c
index 19f01db..24467ce 100644
--- a/common/usb_kbd.c
+++ b/common/usb_kbd.c
@@ -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;
 
-- 
1.7.10.4