linux-kernel - [PATCH net v3 6/9] r8152: disable test IO for RTL8153B

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Date:   Wed, 22 Jan 2020 16:02:10 +0800
From:   Hayes Wang <hayeswang@...ltek.com>
To:     <netdev@...r.kernel.org>
CC:     <nic_swsd@...ltek.com>, <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <pmalani@...omium.org>,
        <grundler@...omium.org>, Hayes Wang <hayeswang@...ltek.com>
Subject: [PATCH net v3 6/9] r8152: disable test IO for RTL8153B

For RTL8153B with QFN32, disable test IO. Otherwise, it may cause
abnormal behavior for the device randomly.

Signed-off-by: Hayes Wang <hayeswang@...ltek.com>
---
 drivers/net/usb/r8152.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 1fb85c79bd33..7efeddad1fc8 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -312,6 +312,7 @@
 /* PLA_PHY_PWR */
 #define TX_10M_IDLE_EN		0x0080
 #define PFM_PWM_SWITCH		0x0040
+#define TEST_IO_OFF		BIT(4)
 
 /* PLA_MAC_PWR_CTRL */
 #define D3_CLK_GATED_EN		0x00004000
@@ -5538,6 +5539,15 @@ static void r8153b_init(struct r8152 *tp)
 	ocp_data &= ~PLA_MCU_SPDWN_EN;
 	ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL3, ocp_data);
 
+	if (tp->version == RTL_VER_09) {
+		/* Disable Test IO for 32QFN */
+		if (ocp_read_byte(tp, MCU_TYPE_PLA, 0xdc00) & BIT(5)) {
+			ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_PHY_PWR);
+			ocp_data |= TEST_IO_OFF;
+			ocp_write_word(tp, MCU_TYPE_PLA, PLA_PHY_PWR, ocp_data);
+		}
+	}
+
 	set_bit(GREEN_ETHERNET, &tp->flags);
 
 	/* rx aggregation */
-- 
2.21.0