From f99cd20eda12b1920ffc284a736437c016b3a5a2 Mon Sep 17 00:00:00 2001
From: Hayes Wang <hayeswang@realtek.com>
Date: Wed, 22 Jan 2020 16:02:06 +0800
Subject: [PATCH] r8152: reset flow control patch when linking on for RTL8153B
Git-commit: f99cd20eda12b1920ffc284a736437c016b3a5a2
References: git-fixes
Patch-mainline: v5.5

When linking ON, the patch of flow control has to be reset. This
makes sure the patch works normally.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/net/usb/r8152.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -126,6 +126,7 @@
 #define USB_LPM_CTRL		0xd41a
 #define USB_BMU_RESET		0xd4b0
 #define USB_U1U2_TIMER		0xd4da
+#define USB_FW_TASK		0xd4e8  /* RTL8153B */
 #define USB_UPS_CTRL		0xd800
 #define USB_POWER_CUT		0xd80a
 #define USB_MISC_0		0xd81a
@@ -394,6 +395,9 @@
 #define OWN_UPDATE		BIT(0)
 #define OWN_CLEAR		BIT(1)
 
+/* USB_FW_TASK */
+#define FC_PATCH_TASK		BIT(1)
+
 /* USB_UPS_CTRL */
 #define POWER_CUT		0x0100
 
@@ -2561,6 +2565,17 @@ static int rtl8153_enable(struct r8152 *
 	r8153_set_rx_early_timeout(tp);
 	r8153_set_rx_early_size(tp);
 
+	if (tp->version == RTL_VER_09) {
+		u32 ocp_data;
+
+		ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_FW_TASK);
+		ocp_data &= ~FC_PATCH_TASK;
+		ocp_write_word(tp, MCU_TYPE_USB, USB_FW_TASK, ocp_data);
+		usleep_range(1000, 2000);
+		ocp_data |= FC_PATCH_TASK;
+		ocp_write_word(tp, MCU_TYPE_USB, USB_FW_TASK, ocp_data);
+	}
+
 	return rtl_enable(tp);
 }