netdev - Re: [PATCH v1 net-next 1/3] net: mdio: mscc-miim: convert to a regmap implementation

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Date:   Sat, 20 Nov 2021 13:25:13 -0800
From:   Colin Foster <colin.foster@...advantage.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Vladimir Oltean <vladimir.oltean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH v1 net-next 1/3] net: mdio: mscc-miim: convert to a
 regmap implementation

Hi Andrew,

Thank you for your feedback! I'll do a sweep for these return cases
before I submit v2.

On Sat, Nov 20, 2021 at 04:09:18PM +0100, Andrew Lunn wrote:
> > @@ -73,22 +84,30 @@ static int mscc_miim_wait_pending(struct mii_bus *bus)
> >  static int mscc_miim_read(struct mii_bus *bus, int mii_id, int regnum)
> >  {
> >  	struct mscc_miim_dev *miim = bus->priv;
> > +	int ret, err;
> >  	u32 val;
> > -	int ret;
> >  
> >  	ret = mscc_miim_wait_pending(bus);
> >  	if (ret)
> >  		goto out;
> >  
> > -	writel(MSCC_MIIM_CMD_VLD | (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> > -	       (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) | MSCC_MIIM_CMD_OPR_READ,
> > -	       miim->regs + MSCC_MIIM_REG_CMD);
> > +	err = regmap_write(miim->regs, MSCC_MIIM_REG_CMD, MSCC_MIIM_CMD_VLD |
> > +			   (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> > +			   (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
> > +			   MSCC_MIIM_CMD_OPR_READ);
> > +
> > +	if (err < 0)
> > +		WARN_ONCE(1, "mscc miim write cmd reg error %d\n", err);
> 
> You should probably return ret here. If the setup fails, i doubt you
> will get anything useful from the hardware.
> 
> >  
> >  	ret = mscc_miim_wait_ready(bus);
> >  	if (ret)
> >  		goto out;
> >  
> > -	val = readl(miim->regs + MSCC_MIIM_REG_DATA);
> > +	err = regmap_read(miim->regs, MSCC_MIIM_REG_DATA, &val);
> > +
> > +	if (err < 0)
> > +		WARN_ONCE(1, "mscc miim read data reg error %d\n", err);
> 
> Same here.
> 
> > +
> >  	if (val & MSCC_MIIM_DATA_ERROR) {
> >  		ret = -EIO;
> >  		goto out;
> > @@ -103,18 +122,20 @@ static int mscc_miim_write(struct mii_bus *bus, int mii_id,
> >  			   int regnum, u16 value)
> >  {
> >  	struct mscc_miim_dev *miim = bus->priv;
> > -	int ret;
> > +	int err, ret;
> >  
> >  	ret = mscc_miim_wait_pending(bus);
> >  	if (ret < 0)
> >  		goto out;
> >  
> > -	writel(MSCC_MIIM_CMD_VLD | (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> > -	       (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
> > -	       (value << MSCC_MIIM_CMD_WRDATA_SHIFT) |
> > -	       MSCC_MIIM_CMD_OPR_WRITE,
> > -	       miim->regs + MSCC_MIIM_REG_CMD);
> > +	err = regmap_write(miim->regs, MSCC_MIIM_REG_CMD, MSCC_MIIM_CMD_VLD |
> > +			   (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> > +			   (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
> > +			   (value << MSCC_MIIM_CMD_WRDATA_SHIFT) |
> > +			   MSCC_MIIM_CMD_OPR_WRITE);
> >  
> > +	if (err < 0)
> > +		WARN_ONCE(1, "mscc miim write error %d\n", err);
> 
> And here, etc.
> 
>     Andrew