Currently we're allocating an entire page to serve as our event buffer. Provided our events are 4 bytes long, it's very unlikely we will even trigger 1k events at once. Even in the worst case scenario where every endpoint triggers one event and we still have a couple of error events, that would still be less than 40 events. In order to cope with future versions of the IP which could (or could not) increase the amount of possible events to trigger simultaneously, we're using an arbitrary size of 64 events for our event buffer. We're saving 3840 bytes by doing so. Signed-off-by: Felipe Balbi <balbi@xxxxxx> --- I will send this patch for v3.9 merge window. Please give it a round of test, though there won't be any issues at all. In fact, in normal usage, I have never seen more than 20 or so events trigger simultaneously. drivers/usb/dwc3/core.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 4999563..5f79d9f 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -55,7 +55,9 @@ #define DWC3_ENDPOINTS_NUM 32 #define DWC3_XHCI_RESOURCES_NUM 2 -#define DWC3_EVENT_BUFFERS_SIZE PAGE_SIZE +#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_TYPE_MASK 0xfe #define DWC3_EVENT_TYPE_DEV 0 -- 1.8.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
