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fsl_usb2_udc: Add a wmb before priming endpoint. 

Add a wmb to fsl_queue_td before priming the endpoint. This ensures that the
modifications to the QH are seen by the hardware.

Added comment as suggested by Felipe Balbi.

Signed-off-by: Will Newton <will.newton@gmail.com>
Acked-by: Li Yang <leoli@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Will Newton 2008-08-12 15:39:16 +01:00 committed by Greg Kroah-Hartman
parent 224b503901
commit 59097fb73c
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/gadget/fsl_usb2_udc.c
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@ -643,6 +643,9 @@ static void fsl_queue_td(struct fsl_ep *ep, struct fsl_req *req)
| EP_QUEUE_HEAD_STATUS_HALT));
dQH->size_ioc_int_sts &= temp;
/* Ensure that updates to the QH will occure before priming. */
wmb();
/* Prime endpoint by writing 1 to ENDPTPRIME */
temp = ep_is_in(ep)
? (1 << (ep_index(ep) + 16))