Commit e71d363d authored Dec 23, 2016 by Felipe Balbi

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@vger.kernel.org> # v4.9
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

parent d6214592

drivers/usb/dwc3/core.h

+1 −3

Original line number	Diff line number	Diff line
		@@ -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