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Subject: Re: [net,v2] net: dsa: lantiq_gswip: Add 200ms assert delay
To:     Aleksander Jan Bajkowski <olek2@wp.pl>, andrew@lunn.ch,
        vivien.didelot@gmail.com, f.fainelli@gmail.com, olteanv@gmail.com,
        davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Martin Blumenstingl <martin.blumenstingl@googlemail.com>
References: <20210912115807.3903-1-olek2@wp.pl>
From:   Hauke Mehrtens <hauke@hauke-m.de>
Message-ID: <c0989c27-e799-cc73-e471-e7bd87934e81@hauke-m.de>
Date:   Sun, 12 Sep 2021 14:14:16 +0200
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In-Reply-To: <20210912115807.3903-1-olek2@wp.pl>
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On 9/12/21 1:58 PM, Aleksander Jan Bajkowski wrote:
> The delay is especially needed by the xRX300 and xRX330 SoCs. Without
> this patch, some phys are sometimes not properly detected.
> 
> The patch was tested on BT Home Hub 5A and D-Link DWR-966.
> 
> Fixes: a09d042b0862 ("net: dsa: lantiq: allow to use all GPHYs on xRX300 and xRX330")
> Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

Acked-by: Hauke Mehrtens <hauke@hauke-m.de>

> ---
>   drivers/net/dsa/lantiq_gswip.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
> index 64d6dfa83122..267324889dd6 100644
> --- a/drivers/net/dsa/lantiq_gswip.c
> +++ b/drivers/net/dsa/lantiq_gswip.c
> @@ -1885,6 +1885,12 @@ static int gswip_gphy_fw_load(struct gswip_priv *priv, struct gswip_gphy_fw *gph
>   
>   	reset_control_assert(gphy_fw->reset);
>   
> +	/* The vendor BSP uses a 200ms delay after asserting the reset line.
> +	 * Without this some users are observing that the PHY is not coming up
> +	 * on the MDIO bus.
> +	 */
> +	msleep(200);
> +
>   	ret = request_firmware(&fw, gphy_fw->fw_name, dev);
>   	if (ret) {
>   		dev_err(dev, "failed to load firmware: %s, error: %i\n",
>