linux-kernel - Re: [PATCH] ARM: at91: pm: set soc_pm.data.mode in at91_pm_secure

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Message-ID: <30ea0614-3384-46a7-9a0e-8a96b97c985d@microchip.com>
Date:   Fri, 20 Oct 2023 16:50:27 +0200
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     <thomas.perrot@...tlin.com>, Russell King <linux@...linux.org.uk>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...on.dev>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <clement.leger@...tlin.com>
Subject: Re: [PATCH] ARM: at91: pm: set soc_pm.data.mode in
 at91_pm_secure_init()

On 20/10/2023 at 15:02, thomas.perrot@...tlin.com wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> From: Thomas Perrot <thomas.perrot@...tlin.com>
> 
> In non secure mode, soc_pm.data.mode is set when entering pm in
> at91_pm_begin(). This value is used (not only) to determine if the system
> is going into slow clock mode (at91_suspend_entering_slow_clock()). This
> function is called from various drivers to check this and act accordingly.
> If not set, the driver might enter an incorrect suspend mode. When using
> secure suspend mode, at91_pm_begin() is not called and thus
> soc_pm.data.mode is not set. Since when using secure suspend, only one
> suspend mode is supported, set this value directly in
> at91_pm_secure_init().
> 
> Signed-off-by: Clément Léger <clement.leger@...tlin.com>
> Signed-off-by: Thomas Perrot <thomas.perrot@...tlin.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
Thanks, best regards,
   Nicolas

> ---
>   arch/arm/mach-at91/pm.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> index 1a26af0fabc7..345b91dc6627 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -1103,6 +1103,7 @@ static void __init at91_pm_secure_init(void)
>          if (res.a0 == 0) {
>                  pr_info("AT91: Secure PM: suspend mode set to %s\n",
>                          pm_modes[suspend_mode].pattern);
> +               soc_pm.data.mode = suspend_mode;
>                  return;
>          }
> 
> @@ -1112,6 +1113,7 @@ static void __init at91_pm_secure_init(void)
>          res = sam_smccc_call(SAMA5_SMC_SIP_GET_SUSPEND_MODE, 0, 0);
>          if (res.a0 == 0) {
>                  pr_warn("AT91: Secure PM: failed to get default mode\n");
> +               soc_pm.data.mode = -1;
>                  return;
>          }
> 
> @@ -1119,6 +1121,7 @@ static void __init at91_pm_secure_init(void)
>                  pm_modes[suspend_mode].pattern);
> 
>          soc_pm.data.suspend_mode = res.a1;
> +       soc_pm.data.mode = soc_pm.data.suspend_mode;
>   }
>   static const struct of_device_id atmel_shdwc_ids[] = {
>          { .compatible = "atmel,sama5d2-shdwc" },
> --
> 2.41.0
>