r8169: set EEE speed down ratio to 1

EEE speed down means speed down MAC MCU clock. It is not from spec.
It is kind of Realtek specific power saving feature. But enable it
may cause some issues, like packet drop or interrupt loss. Different
hardware may have different issues.

EEE speed down ratio (mac ocp 0xe056[7:4]) is used to set EEE speed
down rate. The larger this value is, the more power can save. But it
actually save less power then we expected. And, as mentioned above,
will impact compatibility. So set it to 1 (mac ocp 0xe056[7:4] = 0)
, which means not to speed down, to improve compatibility.

Signed-off-by: ChunHao Lin <hau@realtek.com>
Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://patch.msgid.link/20250918023425.3463-1-hau@realtek.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 75272510f7e26dde0fd24681c2bb3def661b6da4..8903ae90afcbe1457ecae5bd5de809ade8ff78a0 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -3409,7 +3409,7 @@ static void rtl_hw_start_8168h_1(struct rtl8169_private *tp)
                r8168_mac_ocp_modify(tp, 0xd412, 0x0fff, sw_cnt_1ms_ini);
        }
 
-       r8168_mac_ocp_modify(tp, 0xe056, 0x00f0, 0x0070);
+       r8168_mac_ocp_modify(tp, 0xe056, 0x00f0, 0x0000);
        r8168_mac_ocp_modify(tp, 0xe052, 0x6000, 0x8008);
        r8168_mac_ocp_modify(tp, 0xe0d6, 0x01ff, 0x017f);
        r8168_mac_ocp_modify(tp, 0xd420, 0x0fff, 0x047f);
@@ -3514,7 +3514,7 @@ static void rtl_hw_start_8117(struct rtl8169_private *tp)
                r8168_mac_ocp_modify(tp, 0xd412, 0x0fff, sw_cnt_1ms_ini);
        }
 
-       r8168_mac_ocp_modify(tp, 0xe056, 0x00f0, 0x0070);
+       r8168_mac_ocp_modify(tp, 0xe056, 0x00f0, 0x0000);
        r8168_mac_ocp_write(tp, 0xea80, 0x0003);
        r8168_mac_ocp_modify(tp, 0xe052, 0x0000, 0x0009);
        r8168_mac_ocp_modify(tp, 0xd420, 0x0fff, 0x047f);
@@ -3715,7 +3715,7 @@ static void rtl_hw_start_8125_common(struct rtl8169_private *tp)
        r8168_mac_ocp_modify(tp, 0xc0b4, 0x0000, 0x000c);
        r8168_mac_ocp_modify(tp, 0xeb6a, 0x00ff, 0x0033);
        r8168_mac_ocp_modify(tp, 0xeb50, 0x03e0, 0x0040);
-       r8168_mac_ocp_modify(tp, 0xe056, 0x00f0, 0x0030);
+       r8168_mac_ocp_modify(tp, 0xe056, 0x00f0, 0x0000);
        r8168_mac_ocp_modify(tp, 0xe040, 0x1000, 0x0000);
        r8168_mac_ocp_modify(tp, 0xea1c, 0x0003, 0x0001);
        if (tp->mac_version == RTL_GIGA_MAC_VER_70 ||