linux-kernel - Re: [PATCH v1 1/1] mmc: sdhci-of-dwcmshc: Add runtime PM operations for BlueField-3

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Date:   Fri, 12 May 2023 09:35:42 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Liming Sun <limings@...dia.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        David Thompson <davthompson@...dia.com>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] mmc: sdhci-of-dwcmshc: Add runtime PM operations
 for BlueField-3

On Thu, 11 May 2023 at 21:03, Liming Sun <limings@...dia.com> wrote:
>
> This commit implements the runtime PM operations for BlueField-3 SoC
> to disable eMMC card clock when idle.
>
> Reviewed-by: David Thompson <davthompson@...dia.com>
> Signed-off-by: Liming Sun <limings@...dia.com>
> ---
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 76 ++++++++++++++++++++++++++++-
>  1 file changed, 74 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index e68cd87998c8..19ce058fc5f0 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -15,6 +15,7 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/reset.h>
>  #include <linux/sizes.h>
>
> @@ -542,8 +543,10 @@ static int dwcmshc_probe(struct platform_device *pdev)
>         }
>
>  #ifdef CONFIG_ACPI
> -       if (pltfm_data == &sdhci_dwcmshc_bf3_pdata)
> +       if (pltfm_data == &sdhci_dwcmshc_bf3_pdata) {
>                 sdhci_enable_v4_mode(host);
> +               pm_runtime_enable(dev);

Why make this ACPI specific? Wouldn't other platforms benefit from
this change too?

[...]

Kind regards
Uffe