rt2x00: Fix rt2400pci signal

After sampling hundreds of RX frame descriptors,
the results were conclusive:
- The Ralink documentation regarding the SIGNAL and RSSI are wrong.

It turns out that of the 5 BBR registers, we should not use BBR0 and BBR1
for SIGNAL and RSSI respectively, but actually BBR1 and BBR2.
BBR0 does show values, but the exact meaning remains unclear,
but they cannot be translated into a SIGNAL or RSSI field.
BBR3, BBR4 and BBR5 are always 0, so their meaning is unknown.

As it turns out, the reported SIGNAL is the PLCP value, this
in contradiction to what was expected looking at rt2500pci which
only reported the PLCP values for OFDM rates and bitrate values
for CCK rates.

This means we should let the driver raise the flag about the contents
of the SIGNAL field so rt2x00lib can always do the right thing based
on what the driver reports.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index eb2d21c4e8e9..a885254d2e85 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -574,19 +574,21 @@ void rt2x00lib_rxdone(struct queue_entry *entry,
 	u16 fc;
 
 	/*
+	 * If the signal is the plcp value,
+	 * we need to strip the preamble bit (0x08).
+	 */
+	if (rxdesc->signal_plcp)
+		rxdesc->signal &= ~0x08;
+
+	/*
 	 * Update RX statistics.
 	 */
 	sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 	for (i = 0; i < sband->n_bitrates; i++) {
 		rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 
-		/*
-		 * When frame was received with an OFDM bitrate,
-		 * the signal is the PLCP value. If it was received with
-		 * a CCK bitrate the signal is the rate in 100kbit/s.
-		 */
-		if ((rxdesc->ofdm && rate->plcp == rxdesc->signal) ||
-		    (!rxdesc->ofdm && rate->bitrate == rxdesc->signal)) {
+		if ((rxdesc->signal_plcp && rate->plcp == rxdesc->signal) ||
+		    (!rxdesc->signal_plcp && rate->bitrate == rxdesc->signal)) {
 			idx = i;
 			break;
 		}