linux-kernel - Re: [PATCH 4/4] soc: rockchip: io-domain: do more thing about regulator notify

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Message-ID: <CAPDyKFqYPfYqmFWHy818EKam7AOk1gNs99JAy3=W5cDGeE1QrQ@mail.gmail.com>
Date:   Mon, 16 Aug 2021 14:39:50 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Jianqun Xu <jay.xu@...k-chips.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Lee Jones <lee.jones@...aro.org>, zhangchangzhong@...wei.com,
        Heiko Stuebner <heiko@...ech.de>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] soc: rockchip: io-domain: do more thing about
 regulator notify

On Mon, 16 Aug 2021 at 05:20, Jianqun Xu <jay.xu@...k-chips.com> wrote:
>
> Do a fix to rockchip io-domain, follow this orders:
>
> * system running state
>   -> io-domain vsel to 3.3V
>     -> regulator_enable
>       -> vsel change according to regulator voltage
>
> * system running state
>   -> io-domain vsel to 3.3V
>     -> regulator_disable
>
> Found on some Rockchip SoCs, the regulator enable or disable without
> care about the io-domain maybe caused soc damaged.

Can you please try to elaborate on the problem a bit more, as I don't
quite get the problem.

What regulator is causing this problem? Who is the consumer of the regulator?

Kind regards
Uffe

>
> Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>
> ---
>  drivers/soc/rockchip/io-domain.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/soc/rockchip/io-domain.c b/drivers/soc/rockchip/io-domain.c
> index cf8182fc3642..af5fb11ad9a3 100644
> --- a/drivers/soc/rockchip/io-domain.c
> +++ b/drivers/soc/rockchip/io-domain.c
> @@ -123,6 +123,12 @@ static int rockchip_iodomain_notify(struct notifier_block *nb,
>         } else if (event & (REGULATOR_EVENT_VOLTAGE_CHANGE |
>                             REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE)) {
>                 uV = (unsigned long)data;
> +       } else if (event & REGULATOR_EVENT_PRE_ENABLE) {
> +               uV = MAX_VOLTAGE_3_3;
> +       } else if (event & REGULATOR_EVENT_PRE_DISABLE) {
> +               uV = MAX_VOLTAGE_3_3;
> +       } else if (event & REGULATOR_EVENT_ENABLE) {
> +               uV = (unsigned long)data;
>         } else {
>                 return NOTIFY_OK;
>         }
> --
> 2.25.1
>
>
>