R-Car S4-8 datasheet Rev.1.20 describes some additional register
settings at the end of the initialization.

Signed-off-by: Michael Dege <michael.dege@renesas.com>
---
 drivers/phy/renesas/r8a779f0-ether-serdes.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/phy/renesas/r8a779f0-ether-serdes.c b/drivers/phy/renesas/r8a779f0-ether-serdes.c
index ed83c46f6d00c255852cc5af867c89ab0d0db02a..85a19233f6105e7a309832edee3e6b919eb27eb2 100644
--- a/drivers/phy/renesas/r8a779f0-ether-serdes.c
+++ b/drivers/phy/renesas/r8a779f0-ether-serdes.c
@@ -49,6 +49,13 @@ static void r8a779f0_eth_serdes_write32(void __iomem *addr, u32 offs, u32 bank,
 	iowrite32(data, addr + offs);
 }
 
+static u32 r8a779f0_eth_serdes_read32(void __iomem *addr, u32 offs,  u32 bank)
+{
+	iowrite32(bank, addr + RENESAS_ETH_SERDES_BANK_SELECT);
+
+	return ioread32(addr + offs);
+}
+
 static int
 r8a779f0_eth_serdes_reg_wait(struct r8a779f0_eth_serdes_channel *channel,
 			     u32 offs, u32 bank, u32 mask, u32 expected)
@@ -319,6 +326,7 @@ static int r8a779f0_eth_serdes_hw_init_late(struct r8a779f0_eth_serdes_channel
 *channel)
 {
 	int ret;
+	u32 val;
 
 	ret = r8a779f0_eth_serdes_chan_setting(channel);
 	if (ret)
@@ -332,6 +340,26 @@ static int r8a779f0_eth_serdes_hw_init_late(struct r8a779f0_eth_serdes_channel
 
 	r8a779f0_eth_serdes_write32(channel->addr, 0x03d0, 0x380, 0x0000);
 
+	val = r8a779f0_eth_serdes_read32(channel->addr, 0x00c0, 0x180);
+	r8a779f0_eth_serdes_write32(channel->addr, 0x00c0, 0x180, val | BIT(8));
+	ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0100, 0x180, BIT(0), 1);
+	if (ret)
+		return ret;
+	r8a779f0_eth_serdes_write32(channel->addr, 0x00c0, 0x180, val & ~BIT(8));
+	ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0100, 0x180, BIT(0), 0);
+	if (ret)
+		return ret;
+
+	val = r8a779f0_eth_serdes_read32(channel->addr, 0x0144, 0x180);
+	r8a779f0_eth_serdes_write32(channel->addr, 0x0144, 0x180, val | BIT(4));
+	ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0180, 0x180, BIT(0), 1);
+	if (ret)
+		return ret;
+	r8a779f0_eth_serdes_write32(channel->addr, 0x0144, 0x180, val & ~BIT(4));
+	ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0180, 0x180, BIT(0), 0);
+	if (ret)
+		return ret;
+
 	return r8a779f0_eth_serdes_monitor_linkup(channel);
 }
 

-- 
2.25.1

Hi Michael,

kernel test robot noticed the following build errors:

[auto build test ERROR on a5806cd506af5a7c19bcd596e4708b5c464bfd21]

url:    https://github.com/intel-lab-lkp/linux/commits/Michael-Dege/phy-renesas-r8a779f0-ether-serdes-add-USXGMII-mode/20250527-150048
base:   a5806cd506af5a7c19bcd596e4708b5c464bfd21
patch link:    https://lore.kernel.org/r/20250527-renesas-serdes-update-v2-2-ef17c71cd94c%40renesas.com
patch subject: [PATCH v2 2/2] phy: renesas: r8a779f0-ether-serdes: add new step added to latest datasheet
config: arc-randconfig-001-20250527 (https://download.01.org/0day-ci/archive/20250527/202505271711.WM48TTTI-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250527/202505271711.WM48TTTI-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505271711.WM48TTTI-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/phy/renesas/r8a779f0-ether-serdes.c: In function 'r8a779f0_eth_serdes_read32':
>> drivers/phy/renesas/r8a779f0-ether-serdes.c:54:25: error: 'RENESAS_ETH_SERDES_BANK_SELECT' undeclared (first use in this function); did you mean 'R8A779F0_ETH_SERDES_BANK_SELECT'?
      54 |  iowrite32(bank, addr + RENESAS_ETH_SERDES_BANK_SELECT);
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                         R8A779F0_ETH_SERDES_BANK_SELECT
   drivers/phy/renesas/r8a779f0-ether-serdes.c:54:25: note: each undeclared identifier is reported only once for each function it appears in


vim +54 drivers/phy/renesas/r8a779f0-ether-serdes.c

    51	
    52	static u32 r8a779f0_eth_serdes_read32(void __iomem *addr, u32 offs,  u32 bank)
    53	{
  > 54		iowrite32(bank, addr + RENESAS_ETH_SERDES_BANK_SELECT);
    55	
    56		return ioread32(addr + offs);
    57	}
    58	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki