linux-kernel - Re: [linux-sunxi] [PATCH] cpufreq: sun50i: Fix CPU speed bin detection

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Message-ID: <CAJiuCcdZqpoXKuupk_w3F1npZgCHDgb=+Fdd1ukKA22K2PJ6Ww@mail.gmail.com>
Date:   Thu, 31 Oct 2019 19:55:43 +0100
From:   Clément Péron <peron.clem@...il.com>
To:     megous@...ous.com
Cc:     linux-sunxi <linux-sunxi@...glegroups.com>,
        Yangtao Li <tiny.windzz@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        "open list:ALLWINNER CPUFREQ DRIVER" <linux-pm@...r.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-sunxi] [PATCH] cpufreq: sun50i: Fix CPU speed bin detection

Hi Ondrej,

On Thu, 31 Oct 2019 at 19:14, Ondrej Jirman <megous@...ous.com> wrote:
>
> I have failures to boot on Orange Pi 3, because this driver determined
> that my SoC is from the normal bin, but my SoC only works reliably with
> the OPP values for the slowest bin.
>
> Looking at BSP code, I found that efuse values have following meanings
> on H6:
>
> - 0b000 invalid (interpreted in vendor's BSP as normal bin)
> - 0b001 slowest bin
> - 0b011 normal bin
> - 0b111 fastest bin

Maybe have some defines will be more readable no ?
https://megous.com/git/linux/tree/drivers/soc/sunxi/sunxi-sid.c?h=h6-4.9-bsp#n213

#define SUN50I_NVEM_INVALID_CPU_OPP (0b000)
#define SUN50I_NVEM_LOW_CPU_OPP (0b001)
#define SUN50I_NVEM_NORMAL_CPU_OPP (0b011)
#define SUN50I_NVEM_HIGH_CPU_OPP (0b111)

Regards,
Clément

>
> Let's play it safe and interpret 0 as the slowest bin, but fix detection
> of other bins to match vendor code.
>
> Fixes: f328584f7bff ("cpufreq: Add sun50i nvmem based CPU scaling driver")
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> ---
>
> See https://megous.com/git/linux/tree/drivers/soc/sunxi/sunxi-sid.c?h=h6-4.9-bsp#n484
> and https://megous.com/git/linux/tree/drivers/cpufreq/sunxi-cpufreq.c?h=h6-4.9-bsp#n428
> (1 is substracted from soc_bin number here!)
>
>  drivers/cpufreq/sun50i-cpufreq-nvmem.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> index df35ef3ef567..41dad03e245c 100644
> --- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> @@ -71,9 +71,12 @@ static int sun50i_cpufreq_get_efuse(u32 *versions)
>         efuse_value = (*speedbin >> NVMEM_SHIFT) & NVMEM_MASK;
>         switch (efuse_value) {
>         case 0b0001:
> -               *versions = 1;
> +               *versions = 0;
>                 break;
>         case 0b0011:
> +               *versions = 1;
> +               break;
> +       case 0b0111:
>                 *versions = 2;
>                 break;
>         default:
> --
> 2.23.0
>
> --
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