linux-kernel - Re: [PATCH v2 4/6] soc: sifive: ccache: reduce printing on init

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Date:   Mon, 5 Sep 2022 18:36:15 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <zong.li@...ive.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <palmer@...belt.com>,
        <paul.walmsley@...ive.com>, <aou@...s.berkeley.edu>,
        <greentime.hu@...ive.com>, <ben.dooks@...ive.com>, <bp@...en8.de>,
        <devicetree@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/6] soc: sifive: ccache: reduce printing on init

On 05/09/2022 09:31, Zong Li wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> From: Ben Dooks <ben.dooks@...ive.com>
> 
> The driver prints out 6 lines on startup, which can easily be redcued
> to two lines without losing any information.
> 
> Note, to make the types work better, uint64_t has been replaced with
> ULL to make the unsigned long long match the format in the print
> statement.
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ive.com>

Hey Zong,
Missing your SoB after Ben's here btw.

> ---
>  drivers/soc/sifive/sifive_ccache.c | 25 +++++++++++--------------
>  1 file changed, 11 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/soc/sifive/sifive_ccache.c b/drivers/soc/sifive/sifive_ccache.c
> index 0e0eb85c94d8..401c67a485e2 100644
> --- a/drivers/soc/sifive/sifive_ccache.c
> +++ b/drivers/soc/sifive/sifive_ccache.c
> @@ -81,20 +81,17 @@ static void setup_sifive_debug(void)
> 
>  static void ccache_config_read(void)
>  {
> -       u32 regval, val;
> -
> -       regval = readl(ccache_base + SIFIVE_CCACHE_CONFIG);
> -       val = regval & 0xFF;
> -       pr_info("CCACHE: No. of Banks in the cache: %d\n", val);
> -       val = (regval & 0xFF00) >> 8;
> -       pr_info("CCACHE: No. of ways per bank: %d\n", val);
> -       val = (regval & 0xFF0000) >> 16;
> -       pr_info("CCACHE: Sets per bank: %llu\n", (uint64_t)1 << val);
> -       val = (regval & 0xFF000000) >> 24;
> -       pr_info("CCACHE: Bytes per cache block: %llu\n", (uint64_t)1 << val);
> -
> -       regval = readl(ccache_base + SIFIVE_CCACHE_WAYENABLE);
> -       pr_info("CCACHE: Index of the largest way enabled: %d\n", regval);
> +       u32 cfg;
> +
> +       cfg = readl(ccache_base + SIFIVE_CCACHE_CONFIG);
> +
> +       pr_info("CCACHE: %u banks, %u ways, sets/bank=%llu, bytes/block=%llu\n",
> +               (cfg & 0xff), (cfg >> 8) & 0xff,
> +               BIT_ULL((cfg >> 16) & 0xff),
> +               BIT_ULL((cfg >> 24) & 0xff));

Could we use defines please for the register shifts please?

> +
> +       cfg = readl(ccache_base + SIFIVE_CCACHE_WAYENABLE);
> +       pr_info("CCACHE: Index of the largest way enabled: %d\n", cfg);

%u here no?
Thanks,
Conor.

>  }
> 
>  static const struct of_device_id sifive_ccache_ids[] = {
> --
> 2.17.1
>