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

Florian Fainelli
2017-02-04T02:16:43Z

On 02/03/2017 01:39 PM, Jon Mason wrote:
> From: Joey Zhong <zhongx@broadcom.com>
>
> Implements suspend/resume, external phy 54810 is assumed
> to remain powered up during deep-sleep for wake-on-lane.

s/wake-on-lane/Wake-on-LAN, are you positive phy_stop() is not
suspending the PHY and issuing BMCR_PWRDOWN write?

This also seems incomplete in that, if the device is really configured
for Wake-on-LAN (through ethtool) you should call
device_set_wakeup_capable() and then check for device_may_wakeup()
during suspend or resume to know which part of the suspend/resume
portion should be done. You could refer to bcmgenet for an example.

>
> +int bgmac_enet_suspend(struct bgmac *bgmac)
> +{
> + netdev_info(bgmac->net_dev, "Suspending\n");

remove that message

> +
> + if (netif_running(bgmac->net_dev)) {
> + 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);
> + }

Can you change the indentation to test for netiff_running() first and
return 0 in that case?

> +
> + phy_stop(bgmac->net_dev->phydev);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(bgmac_enet_suspend);
> +
> +int bgmac_enet_resume(struct bgmac *bgmac)
> +{
> + int rc;
> +
> + netdev_info(bgmac->net_dev, "Resuming\n");

Same here, this needs to be removed.

> +
> + phy_start(bgmac->net_dev->phydev);
> +
> + if (netif_running(bgmac->net_dev)) {
> + 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);
> + }
--
Florian