linux-kernel - Re: [PATCH v2] net: macb: Correct usage of MACB_CAPS_CLK_HW

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Message-ID: <20210104112700.GA106851@ediswmail.ad.cirrus.com>
Date:   Mon, 4 Jan 2021 11:27:00 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <nicolas.ferre@...rochip.com>, <claudiu.beznea@...rochip.com>,
        <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] net: macb: Correct usage of MACB_CAPS_CLK_HW_CHG flag

On Wed, Dec 30, 2020 at 05:44:41PM +0100, Andrew Lunn wrote:
> On Wed, Dec 30, 2020 at 10:33:09AM +0000, Charles Keepax wrote:
> > A new flag MACB_CAPS_CLK_HW_CHG was added and all callers of
> > macb_set_tx_clk were gated on the presence of this flag.
> > 
> > -   if (!clk)
> > + if (!bp->tx_clk || !(bp->caps & MACB_CAPS_CLK_HW_CHG))
> > 
> > However the flag was not added to anything other than the new
> > sama7g5_gem, turning that function call into a no op for all other
> > systems. This breaks the networking on Zynq.
> > 
> > The commit message adding this states: a new capability so that
> > macb_set_tx_clock() to not be called for IPs having this
> > capability
> > 
> > This strongly implies that present of the flag was intended to skip
> > the function not absence of the flag. Update the if statement to
> > this effect, which repairs the existing users.
> > 
> > Fixes: daafa1d33cc9 ("net: macb: add capability to not set the clock rate")
> > Suggested-by: Andrew Lunn <andrew@...n.ch>
> > Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
> 
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> 
> Hi Charles
> 
> Since this is a fix, this should be based on the net tree. And you
> indicate this in the subject line with [PATCH net]. If this applies
> cleanly to net, Dave will probably just accept it, but please keep
> this in mind for any more submissions you make to netdev.

Apologies I totally forgot to add your Reviewed-by on the new
version. Too much turkey on the brain after the fattening season.

Thanks,
Charles