linux-kernel - Re: [PATCH] regulator: qcom-rpmh: Revert "regulator: qcom-rpmh: Use PROBE_FORCE

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Date:   Sat, 13 May 2023 23:38:22 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: qcom-rpmh: Revert "regulator: qcom-rpmh: Use PROBE_FORCE_SYNCHRONOUS"

On Fri, 24 Mar 2023 at 19:05, Douglas Anderson <dianders@...omium.org> wrote:
>
> This reverts commit 58973046c1bf ("regulator: qcom-rpmh: Use
> PROBE_FORCE_SYNCHRONOUS"). Further digging into the problems that
> prompted the us to switch to synchronous probe showed that the root
> cause was a missing "rootwait" in the kernel command line
> arguments. Let's reinstate asynchronous probe.

Hi, the asynchronous probe is broken on Dragonboard 845c (SDM845)
running AOSP (Android Open Source Project) with v6.4-rc1
https://bugs.linaro.org/show_bug.cgi?id=5975.
Can we please go back to synchronous probe.

AOSP do not make use of rootwait, IIRC, but it is added by the
bootloader anyway. And the device fails to boot AOSP regardless of
"rootwait" bootarg being present or not.

FWIW I do not see this regression on RB5 (QRB5165/SM8250) running the
same set of AOSP images.

Regards,
Amit Pundir




>
> Fixes: 58973046c1bf ("regulator: qcom-rpmh: Use PROBE_FORCE_SYNCHRONOUS")
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
>
>  drivers/regulator/qcom-rpmh-regulator.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/regulator/qcom-rpmh-regulator.c b/drivers/regulator/qcom-rpmh-regulator.c
> index 903032b2875f..4826d60e5d95 100644
> --- a/drivers/regulator/qcom-rpmh-regulator.c
> +++ b/drivers/regulator/qcom-rpmh-regulator.c
> @@ -1462,7 +1462,7 @@ MODULE_DEVICE_TABLE(of, rpmh_regulator_match_table);
>  static struct platform_driver rpmh_regulator_driver = {
>         .driver = {
>                 .name = "qcom-rpmh-regulator",
> -               .probe_type = PROBE_FORCE_SYNCHRONOUS,
> +               .probe_type = PROBE_PREFER_ASYNCHRONOUS,
>                 .of_match_table = of_match_ptr(rpmh_regulator_match_table),
>         },
>         .probe = rpmh_regulator_probe,
> --
> 2.40.0.348.gf938b09366-goog
>