netdev - Re: [PATCH] net: phy: marvell: clear wol event before setting it

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Message-ID: <20180426155619.2c5d87d1@xhacker.debian>
Date:   Thu, 26 Apr 2018 15:56:19 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Bhadram Varka <vbhadram@...dia.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Jingju Hou <Jingju.Hou@...aptics.com>
Subject: Re: [PATCH] net: phy: marvell: clear wol event before setting it


On Thu, 26 Apr 2018 11:56:33 +0530 Bhadram Varka wrote:

> Hi,
> On 4/26/2018 11:45 AM, Jisheng Zhang wrote:
> > Hi,
> >
> > On Thu, 26 Apr 2018 11:10:21 +0530 Bhadram Varka wrote:
> >  
> >> Hi,
> >>
> >> On 4/19/2018 5:48 PM, Andrew Lunn wrote:  
> >>> On Thu, Apr 19, 2018 at 04:02:32PM +0800, Jisheng Zhang wrote:  

<snip>

> >>>>    		if (err < 0)
> >>>>    			goto error;
> >>>>    
> >>>> +		/* If WOL event happened once, the LED[2] interrupt pin
> >>>> +		 * will not be cleared unless reading the CSISR register.
> >>>> +		 * So clear the WOL event first before enabling it.
> >>>> +		 */
> >>>> +		phy_read(phydev, MII_88E1318S_PHY_CSISR);
> >>>> +  
> >>> Hi Jisheng
> >>>
> >>> The problem with this is, you could be clearing a real interrupt, link
> >>> down/up etc. If interrupts are in use, i think the normal interrupt
> >>> handling will clear the WOL interrupt? So can you make this read
> >>> conditional on !phy_interrupt_is_valid()?  
> >> So this will clear WoL interrupt bit from Copper Interrupt status register.
> >>
> >> How about clearing WoL status (Page 17, register 17) for every WOL event ?
> >>  
> > This is already properly done by setting MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS
> > in m88e1318_set_wol()  
> This part of the code executes only when we enable WOL through ethtool 
> (ethtool -s eth0 wol g)
> 
> Lets say once WOL enabled through magic packet - HW generates WOL 
> interrupt once magic packet received.
> The problem that I see here is that for the next immediate magic packet 
> I don't see WOL interrupt generated by the HW.

hmm, so you want a "stick" WOL feature, I dunno whether Linux kernel
requires WOL should be "stick".