AuxXxilium/linux_dsm_epyc7002
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USB: MUSB: upgrade the isochronous API

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This patch attempts to fix the isochonour API in the musb host
driver.  In particular, the urb->start_frame field should always be
set by the driver; it isn't an input parameter.

The simplest way to accomplish this is to treat all URBs as though the
URB_ISO_ASAP flag was set.  This won't give the right behavior when an
underrun occurs, but I don't know enough about the musb driver to
handle that case.

Unfortunately, I have no way to test this change.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2013-05-29 13:21:01 -04:00 committed by Greg Kroah-Hartman
parent e6b0166f21
commit 8a1ea51f87
1 changed files with 1 additions and 2 deletions
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3
drivers/usb/musb/musb_host.c
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@ -269,8 +269,7 @@ musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
/* FIXME this doesn't implement that scheduling policy ...
* or handle framecounter wrapping
*/
if ((urb->transfer_flags & URB_ISO_ASAP)
|| (frame >= urb->start_frame)) {
if (1) { /* Always assume URB_ISO_ASAP */
/* REVISIT the SOF irq handler shouldn't duplicate
* this code; and we don't init urb->start_frame...
*/