wl1271: Remove busy-word checking

Remove busy-word checking to work around an SPI bug. To reduce the
chance of chipset-busy scenarios, increment the number of fixed busy
words.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1271.h

@@ -115,9 +115,11 @@ enum {
 /*
  * FIXME: for the wl1271, a busy word count of 1 here will result in a more
  * optimal SPI interface. There is some SPI bug however, causing RXS time outs
- * with this mode occasionally on boot, so lets have two for now.
+ * with this mode occasionally on boot, so lets have three for now. A value of
+ * three should make sure, that the chipset will always be ready, though this
+ * will impact throughput and latencies slightly.
  */
-#define WL1271_BUSY_WORD_CNT 2
+#define WL1271_BUSY_WORD_CNT 3
 #define WL1271_BUSY_WORD_LEN (WL1271_BUSY_WORD_CNT * sizeof(u32))
 
 #define WL1271_ELP_HW_STATE_ASLEEP 0

drivers/net/wireless/wl12xx/wl1271_spi.c

@@ -294,9 +294,9 @@ void wl1271_spi_raw_read(struct wl1271 *wl, int addr, void *buf,
 
 	spi_sync(wl->spi, &m);
 
-	/* Check busy words */
-	if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1))
-		wl1271_spi_read_busy(wl, buf, len);
+	/* FIXME: Check busy words, removed due to SPI bug */
+	/* if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1))
+	   wl1271_spi_read_busy(wl, buf, len); */
 
 	wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
 	wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);