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 <amar...@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
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