linux-kernel - Re: [PATCH net-next v4 2/3] net: stmmac: loongson: Use generic PCI suspend/resume routines

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Message-ID: <583585ca-8e89-4a61-93dc-6c47a0362830@linux.dev>
Date: Wed, 12 Nov 2025 09:23:15 +0800
From: Yanteng Si <si.yanteng@...ux.dev>
To: Yao Zi <ziyao@...root.org>, 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>,
 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>,
 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: Re: [PATCH net-next v4 2/3] net: stmmac: loongson: Use generic PCI
 suspend/resume routines


在 2025/11/11 18:07, Yao Zi 写道:
> Convert glue driver for Loongson DWMAC controller to use the generic
> platform suspend/resume routines for PCI controllers, instead of
> implementing its own one.
>
> Signed-off-by: Yao Zi <ziyao@...root.org>
Acked-by: Yanteng Si <siyanteng@...oftware.com.cn


Thanks,

Yanteng
> ---
>   drivers/net/ethernet/stmicro/stmmac/Kconfig   |  6 +++-
>   .../ethernet/stmicro/stmmac/dwmac-loongson.c  | 36 ++-----------------
>   2 files changed, 8 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> index 1350f16f7138..d2bff28fe409 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> @@ -367,15 +367,19 @@ config DWMAC_INTEL
>   	  This selects the Intel platform specific bus support for the
>   	  stmmac driver. This driver is used for Intel Quark/EHL/TGL.
>   
> +if STMMAC_LIBPCI
> +
>   config DWMAC_LOONGSON
>   	tristate "Loongson PCI DWMAC support"
>   	default MACH_LOONGSON64
> -	depends on (MACH_LOONGSON64 || COMPILE_TEST) && STMMAC_ETH && PCI
> +	depends on MACH_LOONGSON64 || COMPILE_TEST
>   	depends on COMMON_CLK
>   	help
>   	  This selects the LOONGSON PCI bus support for the stmmac driver,
>   	  Support for ethernet controller on Loongson-2K1000 SoC and LS7A1000 bridge.
>   
> +endif
> +
>   config STMMAC_PCI
>   	tristate "STMMAC PCI bus support"
>   	depends on STMMAC_ETH && PCI
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> index 2a3ac0136cdb..584dc4ff8320 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> @@ -8,6 +8,7 @@
>   #include <linux/device.h>
>   #include <linux/of_irq.h>
>   #include "stmmac.h"
> +#include "stmmac_libpci.h"
>   #include "dwmac_dma.h"
>   #include "dwmac1000.h"
>   
> @@ -525,37 +526,6 @@ static int loongson_dwmac_fix_reset(struct stmmac_priv *priv, void __iomem *ioad
>   				  10000, 2000000);
>   }
>   
> -static int loongson_dwmac_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;
> -}
> -
> -static int loongson_dwmac_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;
> -}
> -
>   static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>   {
>   	struct plat_stmmacenet_data *plat;
> @@ -600,8 +570,8 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
>   	plat->bsp_priv = ld;
>   	plat->setup = loongson_dwmac_setup;
>   	plat->fix_soc_reset = loongson_dwmac_fix_reset;
> -	plat->suspend = loongson_dwmac_suspend;
> -	plat->resume = loongson_dwmac_resume;
> +	plat->suspend = stmmac_pci_plat_suspend;
> +	plat->resume = stmmac_pci_plat_resume;
>   	ld->dev = &pdev->dev;
>   	ld->loongson_id = readl(res.addr + GMAC_VERSION) & 0xff;
>