linux-kernel - [PATCH 4.8 090/138] rtl8xxxu: Fix rtl8723bu driver reload issue

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Message-Id: <20161109102849.004945257@linuxfoundation.org>
Date:   Wed,  9 Nov 2016 11:46:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jes Sorensen <Jes.Sorensen@...hat.com>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.8 090/138] rtl8xxxu: Fix rtl8723bu driver reload issue

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

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

From: Jes Sorensen <Jes.Sorensen@...hat.com>

commit ab05e5ec81c76f3a852919c22984c885edd2414a upstream.

The generic disable_rf() function clears bits 22 and 23 in
REG_RX_WAIT_CCA, however we did not re-enable them again in
rtl8723b_enable_rf()

This resolves the problem for me with 8723bu devices not working again
after reloading the driver.

Signed-off-by: Jes Sorensen <Jes.Sorensen@...hat.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
@@ -1498,6 +1498,10 @@ static void rtl8723b_enable_rf(struct rt
 	u32 val32;
 	u8 val8;
 
+	val32 = rtl8xxxu_read32(priv, REG_RX_WAIT_CCA);
+	val32 |= (BIT(22) | BIT(23));
+	rtl8xxxu_write32(priv, REG_RX_WAIT_CCA, val32);
+
 	/*
 	 * No indication anywhere as to what 0x0790 does. The 2 antenna
 	 * vendor code preserves bits 6-7 here.