Re: [PATCH V5] ARM: mach-shmobile: Don't init CNTVOFF/counter if PSCI is available
From: Geert Uytterhoeven
Date: Tue May 28 2019 - 04:31:29 EST
On Fri, May 17, 2019 at 11:58 AM Oleksandr Tyshchenko
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
> If PSCI is available then most likely we are running on PSCI-enabled
> U-Boot which, we assume, has already taken care of resetting CNTVOFF
> and updating counter module before switching to non-secure mode
> and we don't need to.
> As the psci_smp_available() helper always returns false if CONFIG_SMP
> is disabled, it can't be used safely as an indicator of PSCI usage.
> For that reason, we check for the mandatory PSCI operation to be
> Please note, an extra check to prevent secure_cntvoff_init() from
> being called for secondary CPUs in headsmp-apmu.S is not needed,
> as SMP code for APMU based system is not executed if PSCI is in use.
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
> Changes in v5:
> - Check for psci_ops.cpu_on if CONFIG_ARM_PSCI_FW is defined
Thanks for the update!
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Two cosmetic comments below. I'll leave it to Simon to ignore them for
> @@ -62,6 +63,21 @@ void __init rcar_gen2_timer_init(void)
> void __iomem *base;
> u32 freq;
> + bool need_update = true;
Some people like reverse Xmas tree declaration order...
> + /*
> + * If PSCI is available then most likely we are running on PSCI-enabled
> + * U-Boot which, we assume, has already taken care of resetting CNTVOFF
> + * and updating counter module before switching to non-secure mode
> + * and we don't need to.
> + */
> +#if defined(CONFIG_ARM_PSCI_FW)
#ifdef CONFIG_ARM_PSCI_FW ?
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds