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Date:   Thu, 22 Apr 2021 14:18:58 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Cc:     Felix Fietkau <nbd@nbd.name>, John Crispin <john@phrozen.org>,
        Sean Wang <sean.wang@mediatek.com>,
        Mark Lee <Mark-MC.Lee@mediatek.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org
Subject: Re: [PATCH net-next 05/14] net: ethernet: mtk_eth_soc: reduce MDIO
 bus access latency
Message-ID: <YIFpsjiqhqEeVXNd@lunn.ch>
References: <20210422040914.47788-1-ilya.lipnitskiy@gmail.com>
 <20210422040914.47788-6-ilya.lipnitskiy@gmail.com>
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On Wed, Apr 21, 2021 at 09:09:05PM -0700, Ilya Lipnitskiy wrote:
> From: Felix Fietkau <nbd@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@nbd.name>
> [Ilya: use readx_poll_timeout_atomic instead of cond_resched]
> Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>


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

    Andrew