From: Dmitri Epshtein <dima@xxxxxxxxxxx>
This patch fix audio record functionality for some Full speed sound blaster devices.
Issue: Sometimes transaction complete indication is coming from HW one frame later.
Solution: If scan_periodic process now frame or previous frame now-1 and sitd transaction
is not finished yet, exit scan_periodic function and check the same transaction in the next frame.
Signed-off-by: Dimitry Epshtein <dima@xxxxxxxxxxx>
Signed-off-by: Saeed Bishara <saeed@xxxxxxxxxxx>
Cc: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/host/ehci-sched.c | 10 +++++++---
1 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index e7a3b08..39340ae 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -2324,9 +2324,13 @@ restart:
* No need to check for activity unless the
* frame is current.
*/
- if (frame == clock_frame && live &&
- (q.sitd->hw_results &
- SITD_ACTIVE(ehci))) {
+ if (((frame == clock_frame) ||
+ (((frame + 1) % ehci->periodic_size)
+ == clock_frame))
+ && live
+ && (q.sitd->hw_results &
+ SITD_ACTIVE(ehci))) {
+
incomplete = true;
q_p = &q.sitd->sitd_next;
hw_p = &q.sitd->hw_next;
--
1.7.0.1
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