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usb: dwc3: decrease event buffer size

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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@ti.com>
This commit is contained in:
Felipe Balbi 2012-12-07 21:42:03 +02:00
parent 7d1f9aeff1
commit 5da9347825
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/dwc3/core.h
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@ -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