linux-kernel - Re: [PATCHv2 2/6] thermal: exynos: Reorder the gpu clock initialization for exynos5420 SoC

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Date:   Wed, 18 May 2022 00:13:16 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 2/6] thermal: exynos: Reorder the gpu clock
 initialization for exynos5420 SoC

Hi Krzysztof,

On Sun, 15 May 2022 at 15:11, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 15/05/2022 08:41, Anand Moon wrote:
> > Reorder the tmu_gpu clock initialization for exynos5422 SoC.
>
> Why?
It just code reorder
>
> >
> > Cc: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> > v1: split the changes and improve the commit messages
> > ---
> >  drivers/thermal/samsung/exynos_tmu.c | 43 ++++++++++++++--------------
> >  1 file changed, 21 insertions(+), 22 deletions(-)
> >
> > diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> > index 75b3afadb5be..1ef90dc52c08 100644
> > --- a/drivers/thermal/samsung/exynos_tmu.c
> > +++ b/drivers/thermal/samsung/exynos_tmu.c
> > @@ -1044,42 +1044,41 @@ static int exynos_tmu_probe(struct platform_device *pdev)
> >               dev_err(&pdev->dev, "Failed to get clock\n");
> >               ret = PTR_ERR(data->clk);
> >               goto err_sensor;
> > -     }
> > -
> > -     data->clk_sec = devm_clk_get(&pdev->dev, "tmu_triminfo_apbif");
> > -     if (IS_ERR(data->clk_sec)) {
> > -             if (data->soc == SOC_ARCH_EXYNOS5420_TRIMINFO) {
> > -                     dev_err(&pdev->dev, "Failed to get triminfo clock\n");
> > -                     ret = PTR_ERR(data->clk_sec);
> > -                     goto err_sensor;
> > -             }
> >       } else {
> > -             ret = clk_prepare_enable(data->clk_sec);
> > +             ret = clk_prepare_enable(data->clk);
>
> This looks a bit odd. The clock was before taken unconditionally, not
> within "else" branch...

The whole *clk_sec*  ie tmu_triminfo_apbif clock enable is being moved
down to the switch case.
tmu_triminfo_apbif  clock is not used by Exynos4412 and Exynos5433 and
Exynos7 SoC.

>
>
> Best regards,
> Krzysztof

Thanks & Regards

-Anand