From 5da93478251cf0dd6b34874c7c1c24a4a52eabc1 Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Fri, 7 Dec 2012 21:42:03 +0200 Subject: [PATCH] usb: dwc3: decrease event buffer size 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 --- 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 -- 2.7.4