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From:   Wong Vee Khee <vee.khee.wong@intel.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@st.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        Jose Abreu <joabreu@synopsys.com>,
        "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc:     netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Wong Vee Khee <vee.khee.wong@intel.com>,
        Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>,
        Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@intel.com>,
        Voon Weifeng <weifeng.voon@intel.com>
Subject: [PATCH net 1/1] stmmac: intel: Fix mdio bus registration issue for TGL-H/ADL-S
Date:   Tue,  2 Mar 2021 16:57:21 +0800
Message-Id: <20210302085721.3168-1-vee.khee.wong@intel.com>
Precedence: bulk

On Intel platforms which consist of two Ethernet Controllers such as
TGL-H and ADL-S, a unique MDIO bus id is required for MDIO bus to be
successful registered:

[   13.076133] sysfs: cannot create duplicate filename '/class/mdio_bus/stmmac-1'
[   13.083404] CPU: 8 PID: 1898 Comm: systemd-udevd Tainted: G     U            5.11.0-net-next #106
[   13.092410] Hardware name: Intel Corporation Alder Lake Client Platform/AlderLake-S ADP-S DRR4 CRB, BIOS ADLIFSI1.R00.1494.B00.2012031421 12/03/2020
[   13.105709] Call Trace:
[   13.108176]  dump_stack+0x64/0x7c
[   13.111553]  sysfs_warn_dup+0x56/0x70
[   13.115273]  sysfs_do_create_link_sd.isra.2+0xbd/0xd0
[   13.120371]  device_add+0x4df/0x840
[   13.123917]  ? complete_all+0x2a/0x40
[   13.127636]  __mdiobus_register+0x98/0x310 [libphy]
[   13.132572]  stmmac_mdio_register+0x1c5/0x3f0 [stmmac]
[   13.137771]  ? stmmac_napi_add+0xa5/0xf0 [stmmac]
[   13.142493]  stmmac_dvr_probe+0x806/0xee0 [stmmac]
[   13.147341]  intel_eth_pci_probe+0x1cb/0x250 [dwmac_intel]
[   13.152884]  pci_device_probe+0xd2/0x150
[   13.156897]  really_probe+0xf7/0x4d0
[   13.160527]  driver_probe_device+0x5d/0x140
[   13.164761]  device_driver_attach+0x4f/0x60
[   13.168996]  __driver_attach+0xa2/0x140
[   13.172891]  ? device_driver_attach+0x60/0x60
[   13.177300]  bus_for_each_dev+0x76/0xc0
[   13.181188]  bus_add_driver+0x189/0x230
[   13.185083]  ? 0xffffffffc0795000
[   13.188446]  driver_register+0x5b/0xf0
[   13.192249]  ? 0xffffffffc0795000
[   13.195577]  do_one_initcall+0x4d/0x210
[   13.199467]  ? kmem_cache_alloc_trace+0x2ff/0x490
[   13.204228]  do_init_module+0x5b/0x21c
[   13.208031]  load_module+0x2a0c/0x2de0
[   13.211838]  ? __do_sys_finit_module+0xb1/0x110
[   13.216420]  __do_sys_finit_module+0xb1/0x110
[   13.220825]  do_syscall_64+0x33/0x40
[   13.224451]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   13.229515] RIP: 0033:0x7fc2b1919ccd
[   13.233113] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 93 31 0c 00 f7 d8 64 89 01 48
[   13.251912] RSP: 002b:00007ffcea2e5b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[   13.259527] RAX: ffffffffffffffda RBX: 0000560558920f10 RCX: 00007fc2b1919ccd
[   13.266706] RDX: 0000000000000000 RSI: 00007fc2b1a881e3 RDI: 0000000000000012
[   13.273887] RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000000
[   13.281036] R10: 0000000000000012 R11: 0000000000000246 R12: 00007fc2b1a881e3
[   13.288183] R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffcea2e5d58
[   13.295389] libphy: mii_bus stmmac-1 failed to register

Fixes: 88af9bd4efbd ("stmmac: intel: Add ADL-S 1Gbps PCI IDs")
Fixes: 8450e23f142f ("stmmac: intel: Add PCI IDs for TGL-H platform")
Signed-off-by: Wong Vee Khee <vee.khee.wong@intel.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-intel.c | 54 ++++++++++++++-----
 1 file changed, 41 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 74b14d647619..e6eaf378e8e7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -462,8 +462,8 @@ static int tgl_common_data(struct pci_dev *pdev,
 	return intel_mgbe_common_data(pdev, plat);
 }
 
-static int tgl_sgmii_data(struct pci_dev *pdev,
-			  struct plat_stmmacenet_data *plat)
+static int tgl_sgmii_phy0_data(struct pci_dev *pdev,
+			       struct plat_stmmacenet_data *plat)
 {
 	plat->bus_id = 1;
 	plat->phy_interface = PHY_INTERFACE_MODE_SGMII;
@@ -472,12 +472,26 @@ static int tgl_sgmii_data(struct pci_dev *pdev,
 	return tgl_common_data(pdev, plat);
 }
 
-static struct stmmac_pci_info tgl_sgmii1g_info = {
-	.setup = tgl_sgmii_data,
+static struct stmmac_pci_info tgl_sgmii1g_phy0_info = {
+	.setup = tgl_sgmii_phy0_data,
 };
 
-static int adls_sgmii_data(struct pci_dev *pdev,
-			   struct plat_stmmacenet_data *plat)
+static int tgl_sgmii_phy1_data(struct pci_dev *pdev,
+			       struct plat_stmmacenet_data *plat)
+{
+	plat->bus_id = 2;
+	plat->phy_interface = PHY_INTERFACE_MODE_SGMII;
+	plat->serdes_powerup = intel_serdes_powerup;
+	plat->serdes_powerdown = intel_serdes_powerdown;
+	return tgl_common_data(pdev, plat);
+}
+
+static struct stmmac_pci_info tgl_sgmii1g_phy1_info = {
+	.setup = tgl_sgmii_phy1_data,
+};
+
+static int adls_sgmii_phy0_data(struct pci_dev *pdev,
+				struct plat_stmmacenet_data *plat)
 {
 	plat->bus_id = 1;
 	plat->phy_interface = PHY_INTERFACE_MODE_SGMII;
@@ -487,10 +501,24 @@ static int adls_sgmii_data(struct pci_dev *pdev,
 	return tgl_common_data(pdev, plat);
 }
 
-static struct stmmac_pci_info adls_sgmii1g_info = {
-	.setup = adls_sgmii_data,
+static struct stmmac_pci_info adls_sgmii1g_phy0_info = {
+	.setup = adls_sgmii_phy0_data,
 };
 
+static int adls_sgmii_phy1_data(struct pci_dev *pdev,
+				struct plat_stmmacenet_data *plat)
+{
+	plat->bus_id = 2;
+	plat->phy_interface = PHY_INTERFACE_MODE_SGMII;
+
+	/* SerDes power up and power down are done in BIOS for ADL */
+
+	return tgl_common_data(pdev, plat);
+}
+
+static struct stmmac_pci_info adls_sgmii1g_phy1_info = {
+	.setup = adls_sgmii_phy1_data,
+};
 static const struct stmmac_pci_func_data galileo_stmmac_func_data[] = {
 	{
 		.func = 6,
@@ -772,11 +800,11 @@ static const struct pci_device_id intel_eth_pci_id_table[] = {
 	{ PCI_DEVICE_DATA(INTEL, EHL_PSE1_RGMII1G_ID, &ehl_pse1_rgmii1g_info) },
 	{ PCI_DEVICE_DATA(INTEL, EHL_PSE1_SGMII1G_ID, &ehl_pse1_sgmii1g_info) },
 	{ PCI_DEVICE_DATA(INTEL, EHL_PSE1_SGMII2G5_ID, &ehl_pse1_sgmii1g_info) },
-	{ PCI_DEVICE_DATA(INTEL, TGL_SGMII1G_ID, &tgl_sgmii1g_info) },
-	{ PCI_DEVICE_DATA(INTEL, TGLH_SGMII1G_0_ID, &tgl_sgmii1g_info) },
-	{ PCI_DEVICE_DATA(INTEL, TGLH_SGMII1G_1_ID, &tgl_sgmii1g_info) },
-	{ PCI_DEVICE_DATA(INTEL, ADLS_SGMII1G_0_ID, &adls_sgmii1g_info) },
-	{ PCI_DEVICE_DATA(INTEL, ADLS_SGMII1G_1_ID, &adls_sgmii1g_info) },
+	{ PCI_DEVICE_DATA(INTEL, TGL_SGMII1G_ID, &tgl_sgmii1g_phy0_info) },
+	{ PCI_DEVICE_DATA(INTEL, TGLH_SGMII1G_0_ID, &tgl_sgmii1g_phy0_info) },
+	{ PCI_DEVICE_DATA(INTEL, TGLH_SGMII1G_1_ID, &tgl_sgmii1g_phy1_info) },
+	{ PCI_DEVICE_DATA(INTEL, ADLS_SGMII1G_0_ID, &adls_sgmii1g_phy0_info) },
+	{ PCI_DEVICE_DATA(INTEL, ADLS_SGMII1G_1_ID, &adls_sgmii1g_phy1_info) },
 	{}
 };
 MODULE_DEVICE_TABLE(pci, intel_eth_pci_id_table);
-- 
2.17.0