* [PATCH net-next v4 2/2] r8169: enable LTR support
2026-01-09 7:04 [PATCH net-next v4 0/2] r8169: add dash and LTR support javen
2026-01-09 7:04 ` [PATCH net-next v4 1/2] r8169: add DASH support for RTL8127AP javen
@ 2026-01-09 7:04 ` javen
2026-01-13 10:00 ` [PATCH net-next v4 0/2] r8169: add dash and " patchwork-bot+netdevbpf
2 siblings, 0 replies; 4+ messages in thread
From: javen @ 2026-01-09 7:04 UTC (permalink / raw)
To: hkallweit1, nic_swsd, andrew+netdev, davem, edumazet, kuba,
pabeni, horms
Cc: netdev, linux-kernel, Javen Xu
From: Javen Xu <javen_xu@realsil.com.cn>
This patch will enable
RTL8168FP/RTL8168EP/RTL8168H/RTL8125/RTL8126/RTL8127 LTR support.
Signed-off-by: Javen Xu <javen_xu@realsil.com.cn>
---
v2: Replace some register numbers with names according to datasheet.
v3: Address some checkpatch warnings and remove rtl_ltr_disable().
v4: Fix some formatting changes.
---
drivers/net/ethernet/realtek/r8169_main.c | 98 +++++++++++++++++++++++
1 file changed, 98 insertions(+)
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index f9df6aadacce..9b89bbf67198 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -312,6 +312,15 @@ 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 {
@@ -397,6 +406,8 @@ 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 {
@@ -2919,6 +2930,92 @@ 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;
@@ -2947,6 +3044,7 @@ 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:
--
2.43.0
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