linux-kernel - Re: [PATCH v2 03/28] clk: renesas: rzg2l: lock around writes to mux register

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Message-ID: <CAMuHMdWQJBYhhEYDBYqek_h_0a7b1iSDK6cjBTiD-xqNrWrhNQ@mail.gmail.com>
Date:   Tue, 3 Oct 2023 17:18:06 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Claudiu <claudiu.beznea@...on.dev>
Cc:     mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linus.walleij@...aro.org, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, magnus.damm@...il.com,
        catalin.marinas@....com, will@...nel.org,
        quic_bjorande@...cinc.com, konrad.dybcio@...aro.org, arnd@...db.de,
        neil.armstrong@...aro.org, prabhakar.mahadev-lad.rj@...renesas.com,
        biju.das.jz@...renesas.com, linux-renesas-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 03/28] clk: renesas: rzg2l: lock around writes to mux register

On Fri, Sep 29, 2023 at 7:39 AM Claudiu <claudiu.beznea@...on.dev> wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> SD MUX output (SD0) is further divided by 4 in G2{L, UL}. The divided
> clock is SD0_DIV4. SD0_DIV4 is registered with CLK_SET_RATE_PARENT which
> means a rate request for it is propagated to the MUX and could reach
> rzg2l_cpg_sd_clk_mux_set_parent() concurrently with the users of SD0.
> Add proper locking to avoid concurrent access on SD MUX set rate
> registers.
>
> Fixes: eaff33646f4cb ("clk: renesas: rzg2l: Add SDHI clk mux support")
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
>
> Changes in v2:
> - adapted delay_us to 10us
> - adapted CPG_SDHI_CLK_SWITCH_STATUS_TIMEOUT_US to 200us; tested
>   with this adjustements on RZ/G3S and RZ/G2L SoCs

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
i.e. will queue in renesas-clk-for-v6.7.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

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