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Subject: Re: [PATCH 3/3] net: ethernet: bgmac: driver power manangement
To: Jon Mason <jon.mason@broadcom.com>, David Miller <davem@davemloft.net>
References: <1486157970-6315-1-git-send-email-jon.mason@broadcom.com>
 <1486157970-6315-4-git-send-email-jon.mason@broadcom.com>
Cc: rafal@milecki.pl, bcm-kernel-feedback-list@broadcom.com,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Joey Zhong <zhongx@broadcom.com>
From: Florian Fainelli <f.fainelli@gmail.com>
Message-ID: <74efc661-f07d-93d5-613d-7f563c0fe732@gmail.com>
Date: Fri, 3 Feb 2017 18:16:43 -0800
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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