linux-kernel - [PATCH net-next 1/3] net: stmmac: Add generic suspend/resume helper for PCI-based controllers

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Message-ID: <20251028154332.59118-2-ziyao@disroot.org>
Date: Tue, 28 Oct 2025 15:43:30 +0000
From: Yao Zi <ziyao@...root.org>
To: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Yanteng Si <si.yanteng@...ux.dev>,
	Huacai Chen <chenhuacai@...nel.org>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	Philipp Stanner <phasta@...nel.org>,
	Tiezhu Yang <yangtiezhu@...ngson.cn>,
	Qunqin Zhao <zhaoqunqin@...ngson.cn>,
	Yao Zi <ziyao@...root.org>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Furong Xu <0x1207@...il.com>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Jacob Keller <jacob.e.keller@...el.com>
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/3] net: stmmac: Add generic suspend/resume helper for PCI-based controllers

Most glue driver for PCI-based DWMAC controllers utilize similar
platform suspend/resume routines. Add a generic implementation to reduce
duplicated code.

Signed-off-by: Yao Zi <ziyao@...root.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  2 +
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 37 +++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index d5af9344dfb0..baa4ff14bdfe 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -395,6 +395,8 @@ int stmmac_xdp_open(struct net_device *dev);
 void stmmac_xdp_release(struct net_device *dev);
 int stmmac_resume(struct device *dev);
 int stmmac_suspend(struct device *dev);
+int stmmac_pci_plat_suspend(struct device *dev, void *bsp_priv);
+int stmmac_pci_plat_resume(struct device *dev, void *bsp_priv);
 void stmmac_dvr_remove(struct device *dev);
 int stmmac_dvr_probe(struct device *device,
 		     struct plat_stmmacenet_data *plat_dat,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index fd5106880192..3bd284019ca7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -28,6 +28,7 @@
 #include <linux/if_vlan.h>
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
+#include <linux/pci.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_wakeirq.h>
 #include <linux/prefetch.h>
@@ -7938,6 +7939,42 @@ EXPORT_SYMBOL_GPL(stmmac_resume);
 DEFINE_SIMPLE_DEV_PM_OPS(stmmac_simple_pm_ops, stmmac_suspend, stmmac_resume);
 EXPORT_SYMBOL_GPL(stmmac_simple_pm_ops);
 
+#ifdef CONFIG_PCI
+int stmmac_pci_plat_suspend(struct device *dev, void *bsp_priv)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	int ret;
+
+	ret = pci_save_state(pdev);
+	if (ret)
+		return ret;
+
+	pci_disable_device(pdev);
+	pci_wake_from_d3(pdev, true);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(stmmac_pci_plat_suspend);
+
+int stmmac_pci_plat_resume(struct device *dev, void *bsp_priv)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	int ret;
+
+	pci_restore_state(pdev);
+	pci_set_power_state(pdev, PCI_D0);
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	pci_set_master(pdev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(stmmac_pci_plat_resume);
+#endif /* CONFIG_PCI */
+
 #ifndef MODULE
 static int __init stmmac_cmdline_opt(char *str)
 {
-- 
2.50.1