This is a note to let you know that I've just added the patch titled
usb: dwc3: core: avoid Overflow events
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From e71d363d9c611c99fb78f53bfee99616e7fe352c Mon Sep 17 00:00:00 2001
From: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Date: Fri, 23 Dec 2016 14:40:40 +0200
Subject: usb: dwc3: core: avoid Overflow events
Now that we're handling so many transfers at a time
and for some dwc3 revisions LPM events *must* be
enabled, we can fall into a situation where too many
events fire and we start receiving Overflow events.
Let's do what XHCI does and allocate a full page for
the Event Ring, this will avoid any future issues.
Cc: <stable@xxxxxxxxxxxxxxx> # v4.9
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.h | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index de5a8570be04..7bf8016e1182 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -45,9 +45,7 @@
#define DWC3_XHCI_RESOURCES_NUM 2
#define DWC3_SCRATCHBUF_SIZE 4096 /* each buffer is assumed to be 4KiB */
-#define DWC3_EVENT_SIZE 4 /* bytes */
-#define DWC3_EVENT_MAX_NUM 64 /* 2 events/endpoint */
-#define DWC3_EVENT_BUFFERS_SIZE (DWC3_EVENT_SIZE * DWC3_EVENT_MAX_NUM)
+#define DWC3_EVENT_BUFFERS_SIZE 4096
#define DWC3_EVENT_TYPE_MASK 0xfe
#define DWC3_EVENT_TYPE_DEV 0
--
2.11.0
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