netdev - Re: [PATCH V2] net: phy: tja11xx: Add IRQ support to the driver

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Date:   Tue, 28 May 2019 22:00:16 +0200
From:   Marek Vasut <marex@...x.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH V2] net: phy: tja11xx: Add IRQ support to the driver

On 5/28/19 9:58 PM, Andrew Lunn wrote:
> On Tue, May 28, 2019 at 09:46:47PM +0200, Marek Vasut wrote:
>> On 5/28/19 9:35 PM, Heiner Kallweit wrote:
>>> On 28.05.2019 21:31, Marek Vasut wrote:
>>>> On 5/28/19 9:28 PM, Heiner Kallweit wrote:
>>>>> On 28.05.2019 21:23, Marek Vasut wrote:
>>>>>> Add support for handling the TJA11xx PHY IRQ signal.
>>>>>>
>>>>>> Signed-off-by: Marek Vasut <marex@...x.de>
>>>>>> Cc: Andrew Lunn <andrew@...n.ch>
>>>>>> Cc: Florian Fainelli <f.fainelli@...il.com>
>>>>>> Cc: Guenter Roeck <linux@...ck-us.net>
>>>>>> Cc: Heiner Kallweit <hkallweit1@...il.com>
>>>>>> Cc: Jean Delvare <jdelvare@...e.com>
>>>>>> Cc: linux-hwmon@...r.kernel.org
>>>>>> ---
>>>>>> V2: - Define each bit of the MII_INTEN register and a mask
>>>>>>     - Drop IRQ acking from tja11xx_config_intr()
>>>>>> ---
>>>>>>  drivers/net/phy/nxp-tja11xx.c | 48 +++++++++++++++++++++++++++++++++++
>>>>>>  1 file changed, 48 insertions(+)
>>>>>>
>>>>>> diff --git a/drivers/net/phy/nxp-tja11xx.c b/drivers/net/phy/nxp-tja11xx.c
>>>>>> index b705d0bd798b..b41af609607d 100644
>>>>>> --- a/drivers/net/phy/nxp-tja11xx.c
>>>>>> +++ b/drivers/net/phy/nxp-tja11xx.c
>  > >>>> @@ -40,6 +40,29 @@
>>>>>>  #define MII_INTSRC_TEMP_ERR		BIT(1)
>>>>>>  #define MII_INTSRC_UV_ERR		BIT(3)
>>>>>>  
>>>>>> +#define MII_INTEN			22
>>>>>> +#define MII_INTEN_PWON_EN		BIT(15)
>>>>>> +#define MII_INTEN_WAKEUP_EN		BIT(14)
>>>>>> +#define MII_INTEN_PHY_INIT_FAIL_EN	BIT(11)
>>>>>> +#define MII_INTEN_LINK_STATUS_FAIL_EN	BIT(10)
>>>>>> +#define MII_INTEN_LINK_STATUS_UP_EN	BIT(9)
>>>>>> +#define MII_INTEN_SYM_ERR_EN		BIT(8)
>>>>>> +#define MII_INTEN_TRAINING_FAILED_EN	BIT(7)
>>>>>> +#define MII_INTEN_SQI_WARNING_EN	BIT(6)
>>>>>> +#define MII_INTEN_CONTROL_ERR_EN	BIT(5)
>>>>>> +#define MII_INTEN_UV_ERR_EN		BIT(3)
>>>>>> +#define MII_INTEN_UV_RECOVERY_EN	BIT(2)
>>>>>> +#define MII_INTEN_TEMP_ERR_EN		BIT(1)
>>>>>> +#define MII_INTEN_SLEEP_ABORT_EN	BIT(0)
>>>>>> +#define MII_INTEN_MASK							\
>>>>>> +	(MII_INTEN_PWON_EN | MII_INTEN_WAKEUP_EN |			\
>>>>>> +	MII_INTEN_PHY_INIT_FAIL_EN | MII_INTEN_LINK_STATUS_FAIL_EN |	\
>>>>>> +	MII_INTEN_LINK_STATUS_UP_EN | MII_INTEN_SYM_ERR_EN |		\
>>>>>> +	MII_INTEN_TRAINING_FAILED_EN | MII_INTEN_SQI_WARNING_EN |	\
>>>>>> +	MII_INTEN_CONTROL_ERR_EN | MII_INTEN_UV_ERR_EN |		\
>>>>>> +	MII_INTEN_UV_RECOVERY_EN | MII_INTEN_TEMP_ERR_EN |		\
>>>>>> +	MII_INTEN_SLEEP_ABORT_EN)
>>>>>
>>>>> Why do you enable all these interrupt sources? As I said, phylib needs
>>>>> link change info only.
>>>>
>>>> Because I need them to reliably detect that the link state changed.
> 
> Hi Marek
> 
> That statement suggests you started with just bits 10 and 9 and it
> failed to detect some sort of link up/down event? What was missed?

The link detection on the TJA1100 (not TJA1101) seems unstable at best,
so I better use all the interrupt sources to nudge the PHY subsystem and
have it check the link change.

-- 
Best regards,
Marek Vasut