[PATCH 5/9] phy: renesas: ethernet serdes: add new step added to new data sheet version

[Michael Dege <michael.dege@xxxxxxxxxxx>]

A new version of the data sheet suggest some additional register writes at
the end of the initialization.

Signed-off-by: Michael Dege <michael.dege@xxxxxxxxxxx>
---
 drivers/phy/renesas/renesas-ether-serdes.c | 30 +++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/renesas/renesas-ether-serdes.c b/drivers/phy/renesas/renesas-ether-serdes.c
index af5f491cfab1..db6426a5fd1d 100644
--- a/drivers/phy/renesas/renesas-ether-serdes.c
+++ b/drivers/phy/renesas/renesas-ether-serdes.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Renesas Ethernet SERDES device driver
  *
- * Copyright (C) 2022 Renesas Electronics Corporation
+ * Copyright (C) 2022-2025 Renesas Electronics Corporation
  */

 #include <linux/delay.h>
@@ -18,6 +18,7 @@
 #define RENESAS_ETH_SERDES_OFFSET              0x0400
 #define RENESAS_ETH_SERDES_BANK_SELECT         0x03fc
 #define RENESAS_ETH_SERDES_TIMEOUT_US          100000
+#define RENESAS_ETH_SERDES_LOCAL_OFFSET        0x2600
 #define RENESAS_ETH_SERDES_NUM_RETRY_LINKUP    3

 struct renesas_eth_serdes_drv_data;
@@ -49,6 +50,12 @@ static void renesas_eth_serdes_write32(void __iomem *addr, u32 offs, u32 bank, u
        iowrite32(data, addr + offs);
 }

+static u32 renesas_eth_serdes_read32(void __iomem *addr, u32 offs,  u32 bank)
+{
+       iowrite32(bank, addr + RENESAS_ETH_SERDES_BANK_SELECT);
+       return ioread32(addr + offs);
+}
+
 static int
 renesas_eth_serdes_reg_wait(struct renesas_eth_serdes_channel *channel,
                             u32 offs, u32 bank, u32 mask, u32 expected)
@@ -316,6 +323,7 @@ static int renesas_eth_serdes_hw_init_late(struct renesas_eth_serdes_channel
 *channel)
 {
        int ret;
+       u32 val;

        ret = renesas_eth_serdes_chan_setting(channel);
        if (ret)
@@ -329,6 +337,26 @@ static int renesas_eth_serdes_hw_init_late(struct renesas_eth_serdes_channel

        renesas_eth_serdes_write32(channel->addr, 0x03d0, 0x380, 0x0000);

+       val = renesas_eth_serdes_read32(channel->addr, 0x00c0, 0x180);
+       renesas_eth_serdes_write32(channel->addr, 0x00c0, 0x180, val | BIT(8));
+       ret = renesas_eth_serdes_reg_wait(channel, 0x0100, 0x180, BIT(0), 1);
+       if (ret)
+               return ret;
+       renesas_eth_serdes_write32(channel->addr, 0x00c0, 0x180, val &= ~BIT(8));
+       ret = renesas_eth_serdes_reg_wait(channel, 0x0100, 0x180, BIT(0), 0);
+       if (ret)
+               return ret;
+
+       val = renesas_eth_serdes_read32(channel->addr, 0x0144, 0x180);
+       renesas_eth_serdes_write32(channel->addr, 0x0144, 0x180, val | BIT(4));
+       ret = renesas_eth_serdes_reg_wait(channel, 0x0180, 0x180, BIT(0), 1);
+       if (ret)
+               return ret;
+       renesas_eth_serdes_write32(channel->addr, 0x0144, 0x180, val &= ~BIT(4));
+       ret = renesas_eth_serdes_reg_wait(channel, 0x0180, 0x180, BIT(0), 0);
+       if (ret)
+               return ret;
+
        return renesas_eth_serdes_monitor_linkup(channel);
 }

--
2.34.1

________________________________

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