linux-kernel - Re: [PATCH] net: phy: meson-gxl: implement meson_gxl_phy

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Message-ID: <36acaa5c-f41a-af88-78dd-cd3714301c12@linaro.org>
Date:   Fri, 4 Aug 2023 10:44:11 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Da Xue <da@...re.computer>, Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: meson-gxl: implement meson_gxl_phy_resume()

Hi Da,

On 04/08/2023 05:07, Da Xue wrote:
> After suspend and resume, the meson GXL internal PHY config needs to
> be initialized again or the carrier cannot be found.
> 
> Signed-off-by: Luke Lu <luke.lu@...re.computer>
> Reviewed-by: Da Xue <da@...re.computer>
> 
> ---
>   drivers/net/phy/meson-gxl.c | 14 +++++++++++++-
>   1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
> index bb9b33b6b..c4a07e6f7 100644
> --- a/drivers/net/phy/meson-gxl.c
> +++ b/drivers/net/phy/meson-gxl.c
> @@ -132,6 +132,18 @@ static int meson_gxl_config_init(struct phy_device *phydev)
>    return 0;
>   }
> 
> +static int meson_gxl_phy_resume(struct phy_device *phydev)
> +{
> + int ret;
> +
> + phy_clear_bits(phydev, MII_BMCR, BMCR_PDOWN);

Call genphy_resume() instead.

> + ret = meson_gxl_config_init(phydev);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}

Please re-indent this function.

> +
>   /* This function is provided to cope with the possible failures of this phy
>    * during aneg process. When aneg fails, the PHY reports that aneg is done
>    * but the value found in MII_LPA is wrong:
> @@ -196,7 +208,7 @@ static struct phy_driver meson_gxl_phy[] = {
>    .config_intr = smsc_phy_config_intr,
>    .handle_interrupt = smsc_phy_handle_interrupt,
>    .suspend        = genphy_suspend,
> - .resume         = genphy_resume,
> + .resume         = meson_gxl_phy_resume,
>    .read_mmd = genphy_read_mmd_unsupported,
>    .write_mmd = genphy_write_mmd_unsupported,
>    }, {
> --
> 2.39.2

Thanks,
Neil