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 dca8a6b4c2e278cd9b889eb0f35d24a4f16c880b..de5999cfadf40e997cbb427e03f709daa0202183 100644 (file)
--- 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: