r8169: add rtl_disable_rxdvgate()

rtl_disable_rxdvgate() is used for disable RXDV_GATE. It is opposite function
of rtl_enable_rxdvgate().

Disable RXDV_GATE does not have to delay. So in this patch, also remove the
delay after disale RXDV_GATE.
Signed-off-by: Chunhao Lin <hau@realtek.com>
Link: https://lore.kernel.org/r/20220928171356.3951-1-hau@realtek.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/realtek/r8169_main.c

@@ -2443,6 +2443,11 @@ static void rtl_wait_txrx_fifo_empty(struct rtl8169_private *tp)
 	}
 }
 
+static void rtl_disable_rxdvgate(struct rtl8169_private *tp)
+{
+	RTL_W32(tp, MISC, RTL_R32(tp, MISC) & ~RXDV_GATED_EN);
+}
+
 static void rtl_enable_rxdvgate(struct rtl8169_private *tp)
 {
 	RTL_W32(tp, MISC, RTL_R32(tp, MISC) | RXDV_GATED_EN);
@@ -2960,7 +2965,7 @@ static void rtl_hw_start_8168g(struct rtl8169_private *tp)
 	rtl_reset_packet_filter(tp);
 	rtl_eri_write(tp, 0x2f8, ERIAR_MASK_0011, 0x1d8f);
 
-	RTL_W32(tp, MISC, RTL_R32(tp, MISC) & ~RXDV_GATED_EN);
+	rtl_disable_rxdvgate(tp);
 
 	rtl_eri_write(tp, 0xc0, ERIAR_MASK_0011, 0x0000);
 	rtl_eri_write(tp, 0xb8, ERIAR_MASK_0011, 0x0000);
@@ -3198,7 +3203,7 @@ static void rtl_hw_start_8168h_1(struct rtl8169_private *tp)
 
 	rtl_eri_write(tp, 0x5f0, ERIAR_MASK_0011, 0x4f87);
 
-	RTL_W32(tp, MISC, RTL_R32(tp, MISC) & ~RXDV_GATED_EN);
+	rtl_disable_rxdvgate(tp);
 
 	rtl_eri_write(tp, 0xc0, ERIAR_MASK_0011, 0x0000);
 	rtl_eri_write(tp, 0xb8, ERIAR_MASK_0011, 0x0000);
@@ -3249,7 +3254,7 @@ static void rtl_hw_start_8168ep(struct rtl8169_private *tp)
 
 	rtl_eri_write(tp, 0x5f0, ERIAR_MASK_0011, 0x4f87);
 
-	RTL_W32(tp, MISC, RTL_R32(tp, MISC) & ~RXDV_GATED_EN);
+	rtl_disable_rxdvgate(tp);
 
 	rtl_eri_write(tp, 0xc0, ERIAR_MASK_0011, 0x0000);
 	rtl_eri_write(tp, 0xb8, ERIAR_MASK_0011, 0x0000);
@@ -3313,7 +3318,7 @@ static void rtl_hw_start_8117(struct rtl8169_private *tp)
 
 	rtl_eri_write(tp, 0x5f0, ERIAR_MASK_0011, 0x4f87);
 
-	RTL_W32(tp, MISC, RTL_R32(tp, MISC) & ~RXDV_GATED_EN);
+	rtl_disable_rxdvgate(tp);
 
 	rtl_eri_write(tp, 0xc0, ERIAR_MASK_0011, 0x0000);
 	rtl_eri_write(tp, 0xb8, ERIAR_MASK_0011, 0x0000);
@@ -3557,8 +3562,7 @@ static void rtl_hw_start_8125_common(struct rtl8169_private *tp)
 	else
 		rtl8125a_config_eee_mac(tp);
 
-	RTL_W32(tp, MISC, RTL_R32(tp, MISC) & ~RXDV_GATED_EN);
-	udelay(10);
+	rtl_disable_rxdvgate(tp);
 }
 
 static void rtl_hw_start_8125a_2(struct rtl8169_private *tp)