realtek: set power management mode

Discovered that EnGenius EWS2910P v1 appears to require a Set Power
Management Mode command for the port control to function.  Ensure
that the power management mode is set to dynamic power management
mode with priority. This should be safe for all gen1 and gen2 boards,
issue a warning if an error is detected.

Signed-off-by: Russell Senior <russell@personaltelco.net>
Link: https://github.com/openwrt/openwrt/pull/24550
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>

diff --git a/target/linux/realtek/patches-6.18/819-net-pse-pd-realtek-pse-mcu-ensure-dynamic-power-mana.patch b/target/linux/realtek/patches-6.18/819-net-pse-pd-realtek-pse-mcu-ensure-dynamic-power-mana.patch
new file mode 100644 (file)
index 0000000..3003996
--- /dev/null
+++ b/target/linux/realtek/patches-6.18/819-net-pse-pd-realtek-pse-mcu-ensure-dynamic-power-mana.patch
@@ -0,0 +1,94 @@
+From 0e7f97c356a8c04bbae1e412ecfac8efa46ec03e Mon Sep 17 00:00:00 2001
+From: Russell Senior <russell@personaltelco.net>
+Date: Mon, 3 Aug 2026 13:44:04 -0700
+Subject: [PATCH] net: pse-pd: realtek-pse-mcu: ensure dynamic power management
+ mode with priority
+
+The MCU may have any power management mode configuration by default
+but the driver should ensure that we run in "Dynamic Power Mgmt with
+Priority" mode. The absence of this command was noted with the
+Engenius EWS2910P v1. In the unexpected case where the opcode is
+not recognized by a different board, the code emits a warning.
+
+The opcode used for gen2 devices is derived from the realtek-poe
+userspace package that preceded the realtek-pse-mcu driver.
+
+Tested on an EWS2910P v1.
+
+Signed-off-by: Russell Senior <russell@personaltelco.net>
+---
+ drivers/net/pse-pd/realtek-pse-mcu-core.c | 31 +++++++++++++++++++++++
+ 1 file changed, 31 insertions(+)
+
+--- a/drivers/net/pse-pd/realtek-pse-mcu-core.c
++++ b/drivers/net/pse-pd/realtek-pse-mcu-core.c
+@@ -65,10 +65,14 @@
+ #define RTPSE_MCU_MAX_PORTS                   48
+ #define RTPSE_MCU_PORT_MAX_PRIORITY           3
+ 
++/* RTPSE_MCU_CMD_SET_POWER_MANAGEMENT_MODE values */
++#define RTPSE_MCU_DYNAMIC_POWER_MGMT_PRIO     0x02    /* dynamic, with port priority */
++
+ enum rtpse_mcu_cmd {
+       RTPSE_MCU_CMD_SET_GLOBAL_STATE,
+       RTPSE_MCU_CMD_GET_SYSTEM_INFO,
+       RTPSE_MCU_CMD_GET_EXT_CONFIG,
++      RTPSE_MCU_CMD_SET_POWER_MANAGEMENT_MODE,
+ 
+       RTPSE_MCU_CMD_PORT_ENABLE,
+       RTPSE_MCU_CMD_PORT_SET_POWER_LIMIT_TYPE,
+@@ -390,6 +394,26 @@ static int rtpse_mcu_set_global_state(st
+       return (resp.payload[0] == 0x0) ? 0 : -EIO;
+ }
+ 
++static int rtpse_mcu_set_power_management_mode(struct rtpse_mcu_ctrl *pse, u8 value)
++{
++      struct rtpse_mcu_msg req, resp;
++      const struct rtpse_mcu_opcode *opc;
++      int ret;
++
++      opc = &pse->dialect->opcode[RTPSE_MCU_CMD_SET_POWER_MANAGEMENT_MODE];
++      if (!opc->valid)
++              return -EOPNOTSUPP;
++
++      rtpse_mcu_msg_init(&req, opc->op);
++      req.payload[0] = value;
++
++      ret = rtpse_mcu_do_xfer(pse, &req, &resp);
++      if (ret)
++              return ret;
++
++      return (resp.payload[0] == 0x0) ? 0 : -EIO;
++}
++
+ /* Port operations */
+ 
+ static int rtpse_mcu_port_get_status(struct rtpse_mcu_ctrl *pse, unsigned int port,
+@@ -974,6 +998,11 @@ int rtpse_mcu_register(struct rtpse_mcu_
+       if (ret)
+               return ret;
+ 
++      /* Ensure that we run in "Dynamic Power Management Mode with Priority" mode */
++      ret = rtpse_mcu_set_power_management_mode(pse, RTPSE_MCU_DYNAMIC_POWER_MGMT_PRIO);
++      if (ret)
++              dev_warn_probe(pse->dev, ret, "failed to set power management mode\n");
++
+       if (!info.system_enable) {
+               ret = rtpse_mcu_set_global_state(pse, true);
+               /* Dialects without a global-state concept (e.g. Gen1) return
+@@ -1093,6 +1122,7 @@ static const struct rtpse_mcu_dialect rt
+               [RTPSE_MCU_CMD_SET_GLOBAL_STATE]        = RTPSE_MCU_OP(0x00),
+               [RTPSE_MCU_CMD_GET_SYSTEM_INFO]         = RTPSE_MCU_OP(0x40),
+               [RTPSE_MCU_CMD_GET_EXT_CONFIG]          = RTPSE_MCU_OP(0x4a),
++              [RTPSE_MCU_CMD_SET_POWER_MANAGEMENT_MODE] = RTPSE_MCU_OP(0x10),
+ 
+               [RTPSE_MCU_CMD_PORT_ENABLE]             = RTPSE_MCU_OP(0x01),
+               [RTPSE_MCU_CMD_PORT_SET_POWER_LIMIT_TYPE] = RTPSE_MCU_OP(0x12),
+@@ -1116,6 +1146,7 @@ static const struct rtpse_mcu_dialect rt
+       .opcode = {
+               [RTPSE_MCU_CMD_GET_SYSTEM_INFO]         = RTPSE_MCU_OP(0x20),
+               [RTPSE_MCU_CMD_GET_EXT_CONFIG]          = RTPSE_MCU_OP(0x2b),
++              [RTPSE_MCU_CMD_SET_POWER_MANAGEMENT_MODE] = RTPSE_MCU_OP(0x17),
+ 
+               [RTPSE_MCU_CMD_PORT_ENABLE]             = RTPSE_MCU_OP(0x00),
+               [RTPSE_MCU_CMD_PORT_SET_POWER_LIMIT_TYPE] = RTPSE_MCU_OP(0x15),