linux-kernel - Re: [PATCH v7 06/11] ARM: sunxi: Add initialization of CNTVOFF

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Date:   Mon, 23 Apr 2018 10:16:09 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Mylène Josserand <mylene.josserand@...tlin.com>
Cc:     linux@...linux.org.uk, wens@...e.org, marc.zyngier@....com,
        mark.rutland@....com, robh+dt@...nel.org, horms@...ge.net.au,
        geert@...ux-m68k.org, magnus.damm@...il.com,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        clabbe.montjoie@...il.com, quentin.schulz@...tlin.com,
        thomas.petazzoni@...tlin.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 06/11] ARM: sunxi: Add initialization of CNTVOFF

On Fri, Apr 20, 2018 at 11:10:17PM +0200, Mylène Josserand wrote:
> Add the initialization of CNTVOFF for sun8i-a83t.
> 
> For boot CPU, create a new machine that handles this
> function's call in an "init_early" callback. We need to initialize
> CNTVOFF before the arch timer's initialization otherwise, it will
> not be taken into account and fails to boot correctly.
> Because of that, this function can't be called in SMP's early_initcall
> function which is called after timer's init.
> 
> For secondary CPUs, add this function into secondary_startup
> assembly entry.
> 
> Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.com>
> ---
>  arch/arm/mach-sunxi/headsmp.S |  1 +
>  arch/arm/mach-sunxi/sunxi.c   | 20 +++++++++++++++++++-
>  2 files changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-sunxi/headsmp.S b/arch/arm/mach-sunxi/headsmp.S
> index 37dc772701f3..32d76be98541 100644
> --- a/arch/arm/mach-sunxi/headsmp.S
> +++ b/arch/arm/mach-sunxi/headsmp.S
> @@ -71,6 +71,7 @@ ENDPROC(sunxi_mc_smp_cluster_cache_enable)
>  
>  ENTRY(sunxi_mc_smp_secondary_startup)
>  	bl	sunxi_mc_smp_cluster_cache_enable
> +	bl	secure_cntvoff_init
>  	b	secondary_startup
>  ENDPROC(sunxi_mc_smp_secondary_startup)
>  
> diff --git a/arch/arm/mach-sunxi/sunxi.c b/arch/arm/mach-sunxi/sunxi.c
> index 5e9602ce1573..ddc439f6269b 100644
> --- a/arch/arm/mach-sunxi/sunxi.c
> +++ b/arch/arm/mach-sunxi/sunxi.c
> @@ -16,6 +16,7 @@
>  #include <linux/platform_device.h>
>  
>  #include <asm/mach/arch.h>
> +#include <asm/secure_cntvoff.h>
>  
>  static const char * const sunxi_board_dt_compat[] = {
>  	"allwinner,sun4i-a10",
> @@ -62,7 +63,6 @@ MACHINE_END
>  static const char * const sun8i_board_dt_compat[] = {
>  	"allwinner,sun8i-a23",
>  	"allwinner,sun8i-a33",
> -	"allwinner,sun8i-a83t",
>  	"allwinner,sun8i-h2-plus",
>  	"allwinner,sun8i-h3",
>  	"allwinner,sun8i-r40",
> @@ -75,6 +75,24 @@ DT_MACHINE_START(SUN8I_DT, "Allwinner sun8i Family")
>  	.dt_compat	= sun8i_board_dt_compat,
>  MACHINE_END
>  
> +void __init sun8i_cntvoff_init(void)
> +{
> +#ifdef CONFIG_SMP
> +	secure_cntvoff_init();
> +#endif
> +}
> +
> +static const char * const sun8i_cntvoff_board_dt_compat[] = {
> +	"allwinner,sun8i-a83t",
> +	NULL,
> +};
> +
> +DT_MACHINE_START(SUN8I_CNTVOFF_DT, "Allwinner sun8i-a83t board")

This name still doesn't really make much sense. It's an A83t, that's
it.

Apart from the other minor comment I had, and once that name has been
fixed:
Acked-by: Maxime Ripard <maxime.ripard@...tlin.com>

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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