From 4440bf5f2e75a6ed5d451569e317c24e6e222e09 Mon Sep 17 00:00:00 2001 From: Yao Zi Date: Mon, 24 Nov 2025 16:04:15 +0000 Subject: [PATCH] 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 Reviewed-by: Russell King (Oracle) Reviewed-by: Yanteng Si Link: https://patch.msgid.link/20251124160417.51514-2-ziyao@disroot.org Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/stmicro/stmmac/Kconfig | 5 ++ drivers/net/ethernet/stmicro/stmmac/Makefile | 1 + .../ethernet/stmicro/stmmac/stmmac_libpci.c | 48 +++++++++++++++++++ .../ethernet/stmicro/stmmac/stmmac_libpci.h | 12 +++++ 4 files changed, 66 insertions(+) create mode 100644 drivers/net/ethernet/stmicro/stmmac/stmmac_libpci.c create mode 100644 drivers/net/ethernet/stmicro/stmmac/stmmac_libpci.h diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig index 87c5bea6c2a2..15ed5c1d071a 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig @@ -349,6 +349,11 @@ config DWMAC_VISCONTI endif +config STMMAC_LIBPCI + tristate + help + This option enables the PCI bus helpers for the stmmac driver. + config DWMAC_INTEL tristate "Intel GMAC support" default X86 diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile index 1681a8a28313..7bf528731034 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Makefile +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile @@ -44,6 +44,7 @@ obj-$(CONFIG_DWMAC_VISCONTI) += dwmac-visconti.o stmmac-platform-objs:= stmmac_platform.o dwmac-altr-socfpga-objs := dwmac-socfpga.o +obj-$(CONFIG_STMMAC_LIBPCI) += stmmac_libpci.o obj-$(CONFIG_STMMAC_PCI) += stmmac-pci.o obj-$(CONFIG_DWMAC_INTEL) += dwmac-intel.o obj-$(CONFIG_DWMAC_LOONGSON) += dwmac-loongson.o diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_libpci.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_libpci.c new file mode 100644 index 000000000000..5c5dd502f79a --- /dev/null +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_libpci.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PCI bus helpers for STMMAC driver + * Copyright (C) 2025 Yao Zi + */ + +#include +#include + +#include "stmmac_libpci.h" + +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); + +MODULE_DESCRIPTION("STMMAC PCI helper library"); +MODULE_AUTHOR("Yao Zi "); +MODULE_LICENSE("GPL"); diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_libpci.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_libpci.h new file mode 100644 index 000000000000..71553184f982 --- /dev/null +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_libpci.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2025 Yao Zi + */ + +#ifndef __STMMAC_LIBPCI_H__ +#define __STMMAC_LIBPCI_H__ + +int stmmac_pci_plat_suspend(struct device *dev, void *bsp_priv); +int stmmac_pci_plat_resume(struct device *dev, void *bsp_priv); + +#endif /* __STMMAC_LIBPCI_H__ */ -- 2.38.1