linux-kernel - Re: [PATCH net-next 05/14] net: ethernet: mtk_eth

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Message-ID: <YIFpsjiqhqEeVXNd@lunn.ch>
Date:   Thu, 22 Apr 2021 14:18:58 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
Cc:     Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 05/14] net: ethernet: mtk_eth_soc: reduce MDIO
 bus access latency

On Wed, Apr 21, 2021 at 09:09:05PM -0700, Ilya Lipnitskiy wrote:
> From: Felix Fietkau <nbd@....name>
> 
> usleep_range often ends up sleeping much longer than the 10-20us provided
> as a range here. This causes significant latency in mdio bus acceses,

I found the same with the FEC driver, and make the same change.

> Signed-off-by: Felix Fietkau <nbd@....name>
> [Ilya: use readx_poll_timeout_atomic instead of cond_resched]
> Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>


Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew