linux-kernel - Re: [PATCH] MIPS: lantiq: gphy: Drop reboot/remove reset asserts

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Message-ID: <CAFBinCCQO4B3a+ft7H1mMgfaS4=qSnmern3ZqD3QGt0815Oh0w@mail.gmail.com>
Date:   Sun, 8 Apr 2018 23:30:27 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Mathias Kresin <dev@...sin.me>, Hauke Mehrtens <hauke@...ke-m.de>
Cc:     john@...ozen.org, linux-mips@...ux-mips.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] MIPS: lantiq: gphy: Drop reboot/remove reset asserts

On Sun, Apr 8, 2018 at 10:30 AM, Mathias Kresin <dev@...sin.me> wrote:
> While doing a global software reset, these bits are not cleared and let
> some bootloader fail to initialise the GPHYs. The bootloader don't
> expect the GPHYs in reset, as they aren't during power on.
>
> The asserts were a workaround for a wrong syscon-reboot mask. With a
> mask set which includes the GPHY resets, these resets aren't required
> any more.
>
> Fixes: 126534141b45 ("MIPS: lantiq: Add a GPHY driver which uses the RCU syscon-mfd")
> Cc: stable@...r.kernel.org # 4.14+
> Signed-off-by: Mathias Kresin <dev@...sin.me>
Acked-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

thank you Mathias!
@Hauke: maybe you can also review this and give feedback?

> ---
>  drivers/soc/lantiq/gphy.c | 34 ----------------------------------
>  1 file changed, 34 deletions(-)
>
> diff --git a/drivers/soc/lantiq/gphy.c b/drivers/soc/lantiq/gphy.c
> index 8d86594..8c31ae7 100644
> --- a/drivers/soc/lantiq/gphy.c
> +++ b/drivers/soc/lantiq/gphy.c
> @@ -30,7 +30,6 @@ struct xway_gphy_priv {
>         struct clk *gphy_clk_gate;
>         struct reset_control *gphy_reset;
>         struct reset_control *gphy_reset2;
> -       struct notifier_block gphy_reboot_nb;
>         void __iomem *membase;
>         char *fw_name;
>  };
> @@ -64,24 +63,6 @@ static const struct of_device_id xway_gphy_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, xway_gphy_match);
>
> -static struct xway_gphy_priv *to_xway_gphy_priv(struct notifier_block *nb)
> -{
> -       return container_of(nb, struct xway_gphy_priv, gphy_reboot_nb);
> -}
> -
> -static int xway_gphy_reboot_notify(struct notifier_block *reboot_nb,
> -                                  unsigned long code, void *unused)
> -{
> -       struct xway_gphy_priv *priv = to_xway_gphy_priv(reboot_nb);
> -
> -       if (priv) {
> -               reset_control_assert(priv->gphy_reset);
> -               reset_control_assert(priv->gphy_reset2);
> -       }
> -
> -       return NOTIFY_DONE;
> -}
> -
>  static int xway_gphy_load(struct device *dev, struct xway_gphy_priv *priv,
>                           dma_addr_t *dev_addr)
>  {
> @@ -205,14 +186,6 @@ static int xway_gphy_probe(struct platform_device *pdev)
>         reset_control_deassert(priv->gphy_reset);
>         reset_control_deassert(priv->gphy_reset2);
>
> -       /* assert the gphy reset because it can hang after a reboot: */
> -       priv->gphy_reboot_nb.notifier_call = xway_gphy_reboot_notify;
> -       priv->gphy_reboot_nb.priority = -1;
> -
> -       ret = register_reboot_notifier(&priv->gphy_reboot_nb);
> -       if (ret)
> -               dev_warn(dev, "Failed to register reboot notifier\n");
> -
>         platform_set_drvdata(pdev, priv);
>
>         return ret;
> @@ -224,17 +197,10 @@ static int xway_gphy_remove(struct platform_device *pdev)
>         struct xway_gphy_priv *priv = platform_get_drvdata(pdev);
>         int ret;
>
> -       reset_control_assert(priv->gphy_reset);
> -       reset_control_assert(priv->gphy_reset2);
> -
>         iowrite32be(0, priv->membase);
>
>         clk_disable_unprepare(priv->gphy_clk_gate);
>
> -       ret = unregister_reboot_notifier(&priv->gphy_reboot_nb);
> -       if (ret)
> -               dev_warn(dev, "Failed to unregister reboot notifier\n");
> -
>         return 0;
>  }
>
> --
> 2.7.4
>