netdev - Re: [PATCH net-next 2/5] net: phy: marvell: fix HWMON enable register for 6390

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Message-ID: <20210413171238.1da8c4ce@thinkpad>
Date:   Tue, 13 Apr 2021 17:12:38 +0200
From:   Marek Behún <kabel@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Russell King <rmk+kernel@...linux.org.uk>, kuba@...nel.org
Subject: Re: [PATCH net-next 2/5] net: phy: marvell: fix HWMON enable
 register for 6390

On Tue, 13 Apr 2021 16:25:33 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> On Tue, Apr 13, 2021 at 09:55:35AM +0200, Marek Behún wrote:
> > Register 27_6.15:14 has the following description in 88E6393X
> > documentation:
> >   Temperature Sensor Enable
> >     0x0 - Sample every 1s
> >     0x1 - Sense rate decided by bits 10:8 of this register
> >     0x2 - Use 26_6.5 (One shot Temperature Sample) to enable
> >     0x3 - Disable
> > 
> > This is compatible with how the 6390 code uses this register currently,
> > but the 6390 code handles it as two 1-bit registers (somewhat), instead
> > of one register with 4 possible values.
> > 
> > Rename this register and define all 4 values according to 6393X
> > documentation.
> > 
> > Signed-off-by: Marek Behún <kabel@...nel.org>
> > ---
> >  drivers/net/phy/marvell.c | 19 +++++++++----------
> >  1 file changed, 9 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
> > index 63788d5c13eb..bae2a225b550 100644
> > --- a/drivers/net/phy/marvell.c
> > +++ b/drivers/net/phy/marvell.c
> > @@ -113,11 +113,11 @@
> >  #define MII_88E1540_COPPER_CTRL3_FAST_LINK_DOWN		BIT(9)
> >  
> >  #define MII_88E6390_MISC_TEST		0x1b
> > -#define MII_88E6390_MISC_TEST_SAMPLE_1S		0
> > -#define MII_88E6390_MISC_TEST_SAMPLE_10MS	BIT(14)
> > -#define MII_88E6390_MISC_TEST_SAMPLE_DISABLE	BIT(15)
> > -#define MII_88E6390_MISC_TEST_SAMPLE_ENABLE	0
> > -#define MII_88E6390_MISC_TEST_SAMPLE_MASK	(0x3 << 14)
> > +#define MII_88E6390_MISC_TEST_TEMP_SENSOR_ENABLE_SAMPLE_1S	(0x0 << 14)
> > +#define MII_88E6390_MISC_TEST_TEMP_SENSOR_ENABLE		(0x1 << 14)
> > +#define MII_88E6390_MISC_TEST_TEMP_SENSOR_ENABLE_ONESHOT	(0x2 << 14)
> > +#define MII_88E6390_MISC_TEST_TEMP_SENSOR_DISABLE		(0x3 << 14)
> > +#define MII_88E6390_MISC_TEST_TEMP_SENSOR_MASK			(0x3 << 14)
> >  
> >  #define MII_88E6390_TEMP_SENSOR		0x1c
> >  #define MII_88E6390_TEMP_SENSOR_MASK	0xff
> > @@ -2352,9 +2352,8 @@ static int m88e6390_get_temp(struct phy_device *phydev, long *temp)
> >  	if (ret < 0)
> >  		goto error;
> >  
> > -	ret = ret & ~MII_88E6390_MISC_TEST_SAMPLE_MASK;
> > -	ret |= MII_88E6390_MISC_TEST_SAMPLE_ENABLE |
> > -		MII_88E6390_MISC_TEST_SAMPLE_1S;
> > +	ret = ret & ~MII_88E6390_MISC_TEST_TEMP_SENSOR_MASK;
> > +	ret |= MII_88E6390_MISC_TEST_TEMP_SENSOR_ENABLE_SAMPLE_1S;  
> 
> So this is identical
> 
> >  
> >  	ret = __phy_write(phydev, MII_88E6390_MISC_TEST, ret);
> >  	if (ret < 0)
> > @@ -2381,8 +2380,8 @@ static int m88e6390_get_temp(struct phy_device *phydev, long *temp)
> >  	if (ret < 0)
> >  		goto error;
> >  
> > -	ret = ret & ~MII_88E6390_MISC_TEST_SAMPLE_MASK;
> > -	ret |= MII_88E6390_MISC_TEST_SAMPLE_DISABLE;
> > +	ret = ret & ~MII_88E6390_MISC_TEST_TEMP_SENSOR_MASK;
> > +	ret |= MII_88E6390_MISC_TEST_TEMP_SENSOR_DISABLE;  
> 
> And here we have gone from 0x2 to 0x3?
> 
> Have you checked the 6390 datasheet for this?
> 
> I will test these patches later.
> 
>      Andrew

The 6390 datasheet does not contain specification for temperature
sensor anymore. I will look into older versions.