linux-kernel - Re: [PATCH] hwspinlock: stm32: implement the relax() ops

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Date:   Fri, 8 Mar 2019 13:42:44 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Fabien Dessenne <fabien.dessenne@...com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-remoteproc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [PATCH] hwspinlock: stm32: implement the relax() ops

Le jeu. 7 mars 2019 à 16:42, Fabien Dessenne <fabien.dessenne@...com> a écrit :
>
> Implement this optional ops, called by hwspinlock core while spinning on
> a lock, between two successive invocations of trylock().
>
> Signed-off-by: Fabien Dessenne <fabien.dessenne@...com>

Reviewed-by: Benjamin Gaignard <benjamin.gaignard@...com>

> ---
>  drivers/hwspinlock/stm32_hwspinlock.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/hwspinlock/stm32_hwspinlock.c b/drivers/hwspinlock/stm32_hwspinlock.c
> index 4418392..c8eacf4 100644
> --- a/drivers/hwspinlock/stm32_hwspinlock.c
> +++ b/drivers/hwspinlock/stm32_hwspinlock.c
> @@ -5,6 +5,7 @@
>   */
>
>  #include <linux/clk.h>
> +#include <linux/delay.h>
>  #include <linux/hwspinlock.h>
>  #include <linux/io.h>
>  #include <linux/kernel.h>
> @@ -42,9 +43,15 @@ static void stm32_hwspinlock_unlock(struct hwspinlock *lock)
>         writel(STM32_MUTEX_COREID, lock_addr);
>  }
>
> +static void stm32_hwspinlock_relax(struct hwspinlock *lock)
> +{
> +       ndelay(50);
> +}
> +
>  static const struct hwspinlock_ops stm32_hwspinlock_ops = {
>         .trylock        = stm32_hwspinlock_trylock,
>         .unlock         = stm32_hwspinlock_unlock,
> +       .relax          = stm32_hwspinlock_relax,
>  };
>
>  static int stm32_hwspinlock_probe(struct platform_device *pdev)
> --
> 2.7.4
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel


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