netdev - Re: stmmac still supporting spear600 ?

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Message-ID: <20170321155054.2f4cb921@free-electrons.com>
Date:   Tue, 21 Mar 2017 15:50:54 +0100
From:   Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:     Giuseppe CAVALLARO <peppe.cavallaro@...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 ?

Hello,

On Thu, 9 Mar 2017 15:56:31 +0100, Giuseppe CAVALLARO wrote:

> On 3/9/2017 10:32 AM, Thomas Petazzoni wrote:
> 
> > OK, I'll have a look. However, I'm still confused by this DMA_RESET bit
> > that never clears, contrary to what the datasheet says. Are there some
> > erratas?  
> 
> I suggest you to take a look at the tx/rx clocks from PHY.
> You have to provide these otherwise you cannot reset the engine.

Thanks for the hint.

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 :)

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com