linux-kernel - Re: [PATCH net v3] net: macb: Correct usage of MACB_CAPS_CLK_HW

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Message-ID: <X/MjyvgHJZrhYQw3@lunn.ch>
Date:   Mon, 4 Jan 2021 15:18:50 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
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 net v3] net: macb: Correct usage of MACB_CAPS_CLK_HW_CHG
 flag

On Mon, Jan 04, 2021 at 10:38:02AM +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>

    Andrew