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From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Wed, 6 Nov 2013 15:32:37 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r257748 - head/sys/dev/usb/wlan
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Author: hselasky
Date: Wed Nov  6 15:32:37 2013
New Revision: 257748
URL: http://svnweb.freebsd.org/changeset/base/257748

Log:
  Implement a working write region function to speed up loading of the
  firmware. You can test this change by switching the "#if 1" statement
  right above in the patched code to "#if 0" !
  
  MFC after:	1 week

Modified:
  head/sys/dev/usb/wlan/if_run.c

Modified: head/sys/dev/usb/wlan/if_run.c
==============================================================================
--- head/sys/dev/usb/wlan/if_run.c	Wed Nov  6 14:38:53 2013	(r257747)
+++ head/sys/dev/usb/wlan/if_run.c	Wed Nov  6 15:32:37 2013	(r257748)
@@ -1170,13 +1170,32 @@ run_write_region_1(struct run_softc *sc,
 	return (error);
 #else
 	usb_device_request_t req;
+	int error = 0;
 
-	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
-	req.bRequest = RT2870_WRITE_REGION_1;
-	USETW(req.wValue, 0);
-	USETW(req.wIndex, reg);
-	USETW(req.wLength, len);
-	return (run_do_request(sc, &req, buf));
+	/*
+	 * NOTE: It appears the WRITE_REGION_1 command cannot be
+	 * passed a huge amount of data, which will crash the
+	 * firmware. Limit amount of data passed to 64-bytes at a
+	 * time:
+	 */
+	while (len > 0) {
+		int delta = 64;
+		if (delta > len)
+			delta = len;
+
+		req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
+		req.bRequest = RT2870_WRITE_REGION_1;
+		USETW(req.wValue, 0);
+		USETW(req.wIndex, reg);
+		USETW(req.wLength, delta);
+		error = run_do_request(sc, &req, __DECONST(uint8_t *, buf));
+		if (error != 0)
+			break;
+		reg += delta;
+		buf += delta;
+		len -= delta;
+	}
+	return (error);
 #endif
 }