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authorNico Huber <nico.huber@secunet.com>2012-11-20 17:49:00 +0100
committerPatrick Georgi <patrick@georgi-clan.de>2012-11-24 08:43:49 +0100
commit8c4d2f36a339ba34c532e29696f2c5b70fb04957 (patch)
tree5b93035eca2db4f38a646d87e92829bab29a1a42 /payloads/libpayload/drivers/usb/uhci.c
parentce407e470d36bd446e7e1f02884c97a98423d5c4 (diff)
downloadcoreboot-8c4d2f36a339ba34c532e29696f2c5b70fb04957.tar.xz
libpayload: Handle underruns in UHCI interrupt queues
If usb_poll() isn't called fast enough, the UHCI controller marks an underrun interrupt queue as done (terminating the queue at the head). We can recover from this situation, when usb_poll() gets called again, and the queue is processed. Change-Id: Id56c9df44d6dbd53cd30ad89dfb5bf5977799829 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: http://review.coreboot.org/1898 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Diffstat (limited to 'payloads/libpayload/drivers/usb/uhci.c')
-rw-r--r--payloads/libpayload/drivers/usb/uhci.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/usb/uhci.c b/payloads/libpayload/drivers/usb/uhci.c
index bfa53f6049..386392b53f 100644
--- a/payloads/libpayload/drivers/usb/uhci.c
+++ b/payloads/libpayload/drivers/usb/uhci.c
@@ -590,6 +590,11 @@ uhci_poll_intr_queue (void *q_)
q->lastread = (q->lastread + 1) % q->total;
return &q->data[current*q->reqsize];
}
+ /* reset queue if we fully processed it after underrun */
+ else if (q->qh->elementlinkptr & FLISTP_TERMINATE) {
+ usb_debug("resetting underrun uhci interrupt queue.\n");
+ q->qh->elementlinkptr = virt_to_phys(q->tds + q->lastread);
+ }
return NULL;
}