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Date:   Tue, 12 Sep 2017 09:59:51 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Golle <daniel@...rotopia.org>,
        Stanislaw Gruszka <sgruszka@...hat.com>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.12 16/22] rt2800: fix TX_PIN_CFG setting for non MT7620 chips

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stanislaw Gruszka <sgruszka@...hat.com>

commit 83ec489193894e52bd395eec470f4f7c4286d4a5 upstream.

Since commit 41977e86c984 ("rt2x00: add support for MT7620") we do not
initialize TX_PIN_CFG setting. This cause breakage at least on some
RT3573 devices. To fix the problem patch restores previous behaviour
for non MT7620 chips.

Fixes: 41977e86c984 ("rt2x00: add support for MT7620")
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1480829
Reported-and-tested-by: Jussi Eloranta <jussi.eloranta@...n.edu>
Cc: Daniel Golle <daniel@...rotopia.org>
Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Acked-by: Daniel Golle <daniel@...rotopia.org>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/ralink/rt2x00/rt2800lib.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
@@ -3699,7 +3699,10 @@ static void rt2800_config_channel(struct
 	if (rt2x00_rt(rt2x00dev, RT3572))
 		rt2800_rfcsr_write(rt2x00dev, 8, 0);
 
-	rt2800_register_read(rt2x00dev, TX_PIN_CFG, &tx_pin);
+	if (rt2x00_rt(rt2x00dev, RT6352))
+		rt2800_register_read(rt2x00dev, TX_PIN_CFG, &tx_pin);
+	else
+		tx_pin = 0;
 
 	switch (rt2x00dev->default_ant.tx_chain_num) {
 	case 3:


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