Re: [PATCH net-next v2 3/3] net: ethernet: bgmac: driver power manangement

[Florian Fainelli <f.fainelli@gmail.com>]

On 02/08/2017 01:24 PM, Jon Mason wrote:
> From: Joey Zhong <zhongx@broadcom.com>
> 
> Implement suspend/resume callbacks in the bgmac driver. This makes sure
> that we de-initialize and re-initialize the hardware correctly before
> entering suspend and when resuming.
> 
> Signed-off-by: Joey Zhong <zhongx@broadcom.com>
> Signed-off-by: Jon Mason <jon.mason@broadcom.com>
> ---
>  drivers/net/ethernet/broadcom/bgmac-platform.c | 34 +++++++++++++++++
>  drivers/net/ethernet/broadcom/bgmac.c          | 51 ++++++++++++++++++++++++++
>  drivers/net/ethernet/broadcom/bgmac.h          |  2 +
>  3 files changed, 87 insertions(+)
> 
> diff --git a/drivers/net/ethernet/broadcom/bgmac-platform.c b/drivers/net/ethernet/broadcom/bgmac-platform.c
> index 2d153f7..3df91e7 100644
> --- a/drivers/net/ethernet/broadcom/bgmac-platform.c
> +++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
> @@ -21,8 +21,12 @@
>  #include <linux/of_net.h>
>  #include "bgmac.h"
>  
> +#define NICPM_PADRING_CFG		0x00000004
>  #define NICPM_IOMUX_CTRL		0x00000008
>  
> +#define NICPM_PADRING_CFG_INIT_VAL	0x74000000
> +#define NICPM_IOMUX_CTRL_INIT_VAL_AX	0x21880000
> +
>  #define NICPM_IOMUX_CTRL_INIT_VAL	0x3196e000
>  #define NICPM_IOMUX_CTRL_SPD_SHIFT	10
>  #define NICPM_IOMUX_CTRL_SPD_10M	0
> @@ -108,6 +112,10 @@ static void bgmac_nicpm_speed_set(struct net_device *net_dev)
>  	if (!bgmac->plat.nicpm_base)
>  		return;
>  
> +	/* SET RGMII IO CONFIG */
> +	writel(NICPM_PADRING_CFG_INIT_VAL,
> +	       bgmac->plat.nicpm_base + NICPM_PADRING_CFG);
> +
>  	val = NICPM_IOMUX_CTRL_INIT_VAL;
>  	switch (bgmac->net_dev->phydev->speed) {
>  	default:
> @@ -239,6 +247,31 @@ static int bgmac_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM
> +static int bgmac_suspend(struct device *dev)
> +{
> +	struct bgmac *bgmac = dev_get_drvdata(dev);
> +
> +	return bgmac_enet_suspend(bgmac);
> +}
> +
> +static int bgmac_resume(struct device *dev)
> +{
> +	struct bgmac *bgmac = dev_get_drvdata(dev);
> +
> +	return bgmac_enet_resume(bgmac);
> +}
> +
> +static const struct dev_pm_ops bgmac_pm_ops = {
> +	.suspend = bgmac_suspend,
> +	.resume = bgmac_resume
> +};
> +
> +#define BGMAC_PM_OPS (&bgmac_pm_ops)
> +#else
> +#define BGMAC_PM_OPS NULL
> +#endif /* CONFIG_PM */
> +
>  static const struct of_device_id bgmac_of_enet_match[] = {
>  	{.compatible = "brcm,amac",},
>  	{.compatible = "brcm,nsp-amac",},
> @@ -252,6 +285,7 @@ static struct platform_driver bgmac_enet_driver = {
>  	.driver = {
>  		.name  = "bgmac-enet",
>  		.of_match_table = bgmac_of_enet_match,
> +		.pm = BGMAC_PM_OPS
>  	},
>  	.probe = bgmac_probe,
>  	.remove = bgmac_remove,
> diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
> index bd549f8..e78c91d 100644
> --- a/drivers/net/ethernet/broadcom/bgmac.c
> +++ b/drivers/net/ethernet/broadcom/bgmac.c
> @@ -1478,6 +1478,7 @@ int bgmac_enet_probe(struct bgmac *bgmac)
>  
>  	net_dev->irq = bgmac->irq;
>  	SET_NETDEV_DEV(net_dev, bgmac->dev);
> +	dev_set_drvdata(bgmac->dev, bgmac);
>  
>  	if (!is_valid_ether_addr(bgmac->mac_addr)) {
>  		dev_err(bgmac->dev, "Invalid MAC addr: %pM\n",
> @@ -1551,5 +1552,55 @@ void bgmac_enet_remove(struct bgmac *bgmac)
>  }
>  EXPORT_SYMBOL_GPL(bgmac_enet_remove);
>  
> +int bgmac_enet_suspend(struct bgmac *bgmac)
> +{
> +	if (!netif_running(bgmac->net_dev))
> +		return 0;
> +
> +	phy_stop(bgmac->net_dev->phydev);
> +
> +	netif_stop_queue(bgmac->net_dev);
> +
> +	napi_disable(&bgmac->napi);
> +
> +	netif_tx_lock(bgmac->net_dev);
> +	netif_device_detach(bgmac->net_dev);
> +	netif_tx_unlock(bgmac->net_dev);
> +
> +	bgmac_chip_intrs_off(bgmac);
> +	bgmac_chip_reset(bgmac);
> +	bgmac_dma_cleanup(bgmac);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(bgmac_enet_suspend);
> +
> +int bgmac_enet_resume(struct bgmac *bgmac)
> +{
> +	int rc;
> +
> +	if (netif_running(bgmac->net_dev))
> +		return 0;

This should be if (!netif_running()) here, if it is running, we need to
do all of what is below.

With that fixed:

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

> +
> +	rc = bgmac_dma_init(bgmac);
> +	if (rc)
> +		return rc;
> +
> +	bgmac_chip_init(bgmac);
> +
> +	napi_enable(&bgmac->napi);
> +
> +	netif_tx_lock(bgmac->net_dev);
> +	netif_device_attach(bgmac->net_dev);
> +	netif_tx_unlock(bgmac->net_dev);
> +
> +	netif_start_queue(bgmac->net_dev);
> +
> +	phy_start(bgmac->net_dev->phydev);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(bgmac_enet_resume);
> +
>  MODULE_AUTHOR("Rafał Miłecki");
>  MODULE_LICENSE("GPL");
> diff --git a/drivers/net/ethernet/broadcom/bgmac.h b/drivers/net/ethernet/broadcom/bgmac.h
> index 5a518fe..741ca27 100644
> --- a/drivers/net/ethernet/broadcom/bgmac.h
> +++ b/drivers/net/ethernet/broadcom/bgmac.h
> @@ -538,6 +538,8 @@ int bgmac_enet_probe(struct bgmac *bgmac);
>  void bgmac_enet_remove(struct bgmac *bgmac);
>  void bgmac_adjust_link(struct net_device *net_dev);
>  int bgmac_phy_connect_direct(struct bgmac *bgmac);
> +int bgmac_enet_suspend(struct bgmac *bgmac);
> +int bgmac_enet_resume(struct bgmac *bgmac);
>  
>  struct mii_bus *bcma_mdio_mii_register(struct bgmac *bgmac);
>  void bcma_mdio_mii_unregister(struct mii_bus *mii_bus);
> 


-- 
Florian