From: Javen Xu <javen_xu@realsil.com.cn>
Date: Fri, 9 Jan 2026 07:04:15 +0000 (+0800)
Subject: r8169: enable LTR support
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ab94a32af704fa9c873094283ae8744a07baf25;p=thirdparty%2Fkernel%2Flinux.git

r8169: enable LTR support

This patch will enable
RTL8168FP/RTL8168EP/RTL8168H/RTL8125/RTL8126/RTL8127 LTR support.

Signed-off-by: Javen Xu <javen_xu@realsil.com.cn>
Link: https://patch.msgid.link/20260109070415.1115-3-javen_xu@realsil.com.cn
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index dca8a6b4c2e27..de5999cfadf40 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -313,6 +313,15 @@ enum rtl_registers {
 	IBIMR0          = 0xfa,
 	IBISR0          = 0xfb,
 	FuncForceEvent	= 0xfc,
+
+	ALDPS_LTR	= 0xe0a2,
+	LTR_OBFF_LOCK	= 0xe032,
+	LTR_SNOOP	= 0xe034,
+
+#define ALDPS_LTR_EN			BIT(0)
+#define LTR_OBFF_LOCK_EN		BIT(0)
+#define LINK_SPEED_CHANGE_EN		BIT(14)
+#define LTR_SNOOP_EN			GENMASK(15, 14)
 };
 
 enum rtl8168_8101_registers {
@@ -398,6 +407,8 @@ enum rtl8168_registers {
 #define PWM_EN				(1 << 22)
 #define RXDV_GATED_EN			(1 << 19)
 #define EARLY_TALLY_EN			(1 << 16)
+	COMBO_LTR_EXTEND	= 0xb6,
+#define COMBO_LTR_EXTEND_EN	BIT(0)
 };
 
 enum rtl8125_registers {
@@ -2998,6 +3009,92 @@ static void rtl_disable_exit_l1(struct rtl8169_private *tp)
 	}
 }
 
+static void rtl_enable_ltr(struct rtl8169_private *tp)
+{
+	switch (tp->mac_version) {
+	case RTL_GIGA_MAC_VER_80:
+		r8168_mac_ocp_write(tp, 0xcdd0, 0x9003);
+		r8168_mac_ocp_modify(tp, LTR_SNOOP, 0x0000, LTR_SNOOP_EN);
+		r8168_mac_ocp_modify(tp, ALDPS_LTR, 0x0000, ALDPS_LTR_EN);
+		r8168_mac_ocp_write(tp, 0xcdd2, 0x8c09);
+		r8168_mac_ocp_write(tp, 0xcdd8, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdd4, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdda, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdd6, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcddc, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcde8, 0x887a);
+		r8168_mac_ocp_write(tp, 0xcdea, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdec, 0x8c09);
+		r8168_mac_ocp_write(tp, 0xcdee, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdf0, 0x8a62);
+		r8168_mac_ocp_write(tp, 0xcdf2, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdf4, 0x883e);
+		r8168_mac_ocp_write(tp, 0xcdf6, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdf8, 0x8849);
+		r8168_mac_ocp_write(tp, 0xcdfa, 0x9003);
+		r8168_mac_ocp_modify(tp, LTR_OBFF_LOCK, 0x0000, LINK_SPEED_CHANGE_EN);
+		break;
+	case RTL_GIGA_MAC_VER_70:
+		r8168_mac_ocp_write(tp, 0xcdd0, 0x9003);
+		r8168_mac_ocp_modify(tp, LTR_SNOOP, 0x0000, LTR_SNOOP_EN);
+		r8168_mac_ocp_modify(tp, ALDPS_LTR, 0x0000, ALDPS_LTR_EN);
+		r8168_mac_ocp_write(tp, 0xcdd2, 0x8c09);
+		r8168_mac_ocp_write(tp, 0xcdd8, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdd4, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdda, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdd6, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcddc, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcde8, 0x887a);
+		r8168_mac_ocp_write(tp, 0xcdea, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdec, 0x8c09);
+		r8168_mac_ocp_write(tp, 0xcdee, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdf0, 0x8a62);
+		r8168_mac_ocp_write(tp, 0xcdf2, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdf4, 0x883e);
+		r8168_mac_ocp_write(tp, 0xcdf6, 0x9003);
+		r8168_mac_ocp_modify(tp, LTR_OBFF_LOCK, 0x0000, LINK_SPEED_CHANGE_EN);
+		break;
+	case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_66:
+		r8168_mac_ocp_write(tp, 0xcdd0, 0x9003);
+		r8168_mac_ocp_modify(tp, LTR_SNOOP, 0x0000, LTR_SNOOP_EN);
+		r8168_mac_ocp_modify(tp, ALDPS_LTR, 0x0000, ALDPS_LTR_EN);
+		r8168_mac_ocp_write(tp, 0xcdd2, 0x889c);
+		r8168_mac_ocp_write(tp, 0xcdd8, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdd4, 0x8c30);
+		r8168_mac_ocp_write(tp, 0xcdda, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdd6, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcddc, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcde8, 0x883e);
+		r8168_mac_ocp_write(tp, 0xcdea, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdec, 0x889c);
+		r8168_mac_ocp_write(tp, 0xcdee, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdf0, 0x8C09);
+		r8168_mac_ocp_write(tp, 0xcdf2, 0x9003);
+		r8168_mac_ocp_modify(tp, LTR_OBFF_LOCK, 0x0000, LINK_SPEED_CHANGE_EN);
+		break;
+	case RTL_GIGA_MAC_VER_46 ... RTL_GIGA_MAC_VER_48:
+	case RTL_GIGA_MAC_VER_52:
+		r8168_mac_ocp_modify(tp, ALDPS_LTR, 0x0000, ALDPS_LTR_EN);
+		RTL_W8(tp, COMBO_LTR_EXTEND, RTL_R8(tp, COMBO_LTR_EXTEND) | COMBO_LTR_EXTEND_EN);
+		fallthrough;
+	case RTL_GIGA_MAC_VER_51:
+		r8168_mac_ocp_modify(tp, LTR_SNOOP, 0x0000, LTR_SNOOP_EN);
+		r8168_mac_ocp_write(tp, 0xe02c, 0x1880);
+		r8168_mac_ocp_write(tp, 0xe02e, 0x4880);
+		r8168_mac_ocp_write(tp, 0xcdd8, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdda, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcddc, 0x9003);
+		r8168_mac_ocp_write(tp, 0xcdd2, 0x883c);
+		r8168_mac_ocp_write(tp, 0xcdd4, 0x8c12);
+		r8168_mac_ocp_write(tp, 0xcdd6, 0x9003);
+		break;
+	default:
+		return;
+	}
+	/* chip can trigger LTR */
+	r8168_mac_ocp_modify(tp, LTR_OBFF_LOCK, 0x0003, LTR_OBFF_LOCK_EN);
+}
+
 static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable)
 {
 	u8 val8;
@@ -3026,6 +3123,7 @@ static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable)
 			break;
 		}
 
+		rtl_enable_ltr(tp);
 		switch (tp->mac_version) {
 		case RTL_GIGA_MAC_VER_46 ... RTL_GIGA_MAC_VER_48:
 		case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_LAST: