netdev - Re: stmmac still supporting spear600 ?

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Date:   Mon, 3 Apr 2017 08:16:50 +0200
From:   Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:     Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
CC:     Alexandre Torgue <alexandre.torgue@...com>,
        <netdev@...r.kernel.org>, Viresh Kumar <vireshk@...nel.org>,
        Shiraz Hashim <shiraz.linux.kernel@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: stmmac still supporting spear600 ?

Hi Thomas

I tested the SMSC on other platform (+ stmmac), not on SPEAr.

ok for reset, keep the radar on clock. Hmm, can you attach a piece of 
log file to see the failure?

Regards
Peppe

On 4/2/2017 11:30 PM, Thomas Petazzoni wrote:
> Hello,
>
> On Thu, 23 Mar 2017 11:33:23 +0100, Giuseppe CAVALLARO wrote:
>
>>> Further research has revealed that everything is working fine on a
>>> platform with a Gigabit PHY connected via GMII.
>>>
>>> However, on a different platform (which I'm using) with a 10/100 PHY
>>> connected via MII, DMA_RESET never clears, and networking doesn't work.
>>> The SMSC PHY LAN8700 is also supposed to be providing the clock through
>>> its TX_CLK pin. I double checked, and both the MAC and PHY are in MII
>>> mode, but still no luck so far.
>>>
>>> Of course, if you have any suggestion or hint, I'm all ears :)
>> I can just you to keep the focus on clock configuration. I tested the
>> SMSC PHY LAN8700
>> w/o any issues on several platform.  In MII both rx/tx_clk are provided
>> by PHY and if you
>> have an external oscillator this should be safe enough, indeed.
>> Another check you can do is about the reset time! Maybe you need to
>> change something
>> when reset the SMSC transceiver, try to increase the delay (if you use
>> GPIO to reset it).
> On which platform did you test with the LAN8700 PHY ? Was it on a
> SPEAr600 based platform ?
>
> If you tested on SPEAr600, what is the GMAC clock configuration (i.e
> the value of the GMAC_CFG_CTR and GMAC_CFG_SYNT registers) ?
>
> Regarding the PHY reset time, our PHY reset pin is not connected to a
> GPIO, but to the system reset logic, so Linux cannot reset the PHY with
> a GPIO.
>
> Thanks!
>
> Thomas