rsi: Use SGI if configured for fixed rate transmission.

Use SGI if configured while sending data packets at a fixed rate.
Signed-off-by: NJahnavi Meher <jahnavi.meher@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rsi/rsi_91x_pkt.c

@@ -81,6 +81,12 @@ int rsi_send_data_pkt(struct rsi_common *common, struct sk_buff *skb)
 		/* Send fixed rate */
 		frame_desc[3] = cpu_to_le16(RATE_INFO_ENABLE);
 		frame_desc[4] = cpu_to_le16(common->min_rate);
+		if (common->vif_info[0].sgi) {
+			if (common->min_rate & 0x100) /* Only MCS rates */
+				frame_desc[4] |=
+					cpu_to_le16(ENABLE_SHORTGI_RATE);
+		}
+
 	}
 
 	frame_desc[6] |= cpu_to_le16(seq_num & 0xfff);

drivers/net/wireless/rsi/rsi_mgmt.h

@@ -69,6 +69,7 @@
 
 #define RSI_LMAC_CLOCK_80MHZ            0x1
 #define RSI_ENABLE_40MHZ                (0x1 << 3)
+#define ENABLE_SHORTGI_RATE		BIT(9)
 
 #define RX_BA_INDICATION                1
 #define RSI_TBL_SZ                      40