From 211280356d9487bf322bb7707beadec915b121fa Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Fri, 29 Mar 2013 17:02:24 -0300
Subject: [PATCH] atusb/fw/mac.c: check CRC and auto-discard bad frames

---
 atusb/fw/mac.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/atusb/fw/mac.c b/atusb/fw/mac.c
index 38c0cf6..63c2fdc 100644
--- a/atusb/fw/mac.c
+++ b/atusb/fw/mac.c
@@ -90,7 +90,10 @@ static int handle_irq(void)
 		return 1;
 
 	spi_begin();
-	spi_send(AT86RF230_BUF_READ);
+	if (!(spi_io(AT86RF230_BUF_READ) & RX_CRC_VALID)) {
+		spi_end();
+		return 1;
+	}
 	size = spi_recv();
 	if (!size || (size & 0x80)) {
 		spi_end();
@@ -181,4 +184,8 @@ void mac_reset(void)
 	mac_irq = NULL;
 	txing = 0;
 	queued_tx_ack = 0;
+
+	/* enable CRC and PHY_RSSI (with RX_CRC_VALID) in SPI status return */
+	reg_write(REG_TRX_CTRL_1,
+	    TX_AUTO_CRC_ON | SPI_CMD_MODE_PHY_RSSI << SPI_CMD_MODE_SHIFT);
 }