From: Marek Vasut <marex@denx.de>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Heiner Kallweit <hkallweit1@gmail.com>,
netdev@vger.kernel.org, Florian Fainelli <f.fainelli@gmail.com>,
Guenter Roeck <linux@roeck-us.net>,
Jean Delvare <jdelvare@suse.com>,
linux-hwmon@vger.kernel.org
Subject: Re: [PATCH V2] net: phy: tja11xx: Add IRQ support to the driver
Date: Mon, 17 Jun 2019 19:43:33 +0200 [thread overview]
Message-ID: <7b280744-9d23-4780-0852-aa502768837f@denx.de> (raw)
In-Reply-To: <20190617171613.GJ17551@lunn.ch>
On 6/17/19 7:16 PM, Andrew Lunn wrote:
> On Thu, Jun 13, 2019 at 05:42:53PM +0200, Marek Vasut wrote:
>> On 5/30/19 1:46 AM, Marek Vasut wrote:
>>> On 5/30/19 1:29 AM, Andrew Lunn wrote:
>>>> On Tue, May 28, 2019 at 11:33:33PM +0200, Marek Vasut wrote:
>>>>> On 5/28/19 11:22 PM, Andrew Lunn wrote:
>>>>>>> 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.
>>>>>>
>>>>>> Then it sounds like you should just ignore interrupts and stay will
>>>>>> polling for the TJA1100.
>>>>>
>>>>> Polling for the link status change is slow(er) than the IRQ driven
>>>>> operation, so I would much rather use the interrupts.
>>>>
>>>> I agree about the speed, but it seems like interrupts on this PHY are
>>>> not so reliable. Polling always works. But unfortunately, you cannot
>>>> have both interrupts and polling to fix up problems when interrupts
>>>> fail. Your call, do you think interrupts really do work?
>>>
>>> It works fine for me this way. And mind you, it's only the TJA1100
>>> that's flaky, the TJA1101 is better.
>>>
>>>> If you say that tja1101 works as expected, then please just use the
>>>> link up/down bits for it.
>>>
>>> I still don't know which bits really trigger link status changes, so I'd
>>> like to play it safe and just trigger on all of them.
>>
>> So what do we do here ?
>
> Hi Marek
>
> My personal preference would be to just enable what is needed. But
> I won't block a patch which enables everything.
Thanks. I don't know exactly what is needed , but I know that if I
enable everything, it works fine. And I'm not getting an interrupt storm
either, so it's probably OKish.
--
Best regards,
Marek Vasut
prev parent reply other threads:[~2019-06-17 17:43 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-28 19:23 [PATCH V2] net: phy: tja11xx: Add IRQ support to the driver Marek Vasut
2019-05-28 19:28 ` Heiner Kallweit
2019-05-28 19:31 ` Marek Vasut
2019-05-28 19:35 ` Heiner Kallweit
2019-05-28 19:46 ` Marek Vasut
2019-05-28 19:58 ` Andrew Lunn
2019-05-28 20:00 ` Marek Vasut
2019-05-28 21:22 ` Andrew Lunn
2019-05-28 21:33 ` Marek Vasut
2019-05-29 23:29 ` Andrew Lunn
2019-05-29 23:46 ` Marek Vasut
2019-06-13 15:42 ` Marek Vasut
2019-06-17 17:16 ` Andrew Lunn
2019-06-17 17:43 ` Marek Vasut [this message]
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