linux-kernel - Re: [PATCH 2/2] mmc: sdhci-iproc: Add support for the legacy sdhci controller on the BCM7211

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Date:   Tue, 8 Jun 2021 14:40:46 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Al Cooper <alcooperx@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Ray Jui <rjui@...adcom.com>, Rob Herring <robh+dt@...nel.org>,
        Scott Branden <sbranden@...adcom.com>
Subject: Re: [PATCH 2/2] mmc: sdhci-iproc: Add support for the legacy sdhci
 controller on the BCM7211

On Wed, 2 Jun 2021 at 21:28, Al Cooper <alcooperx@...il.com> wrote:
>
> Add support for the legacy Arasan sdhci controller on the BCM7211 and
> related SoC's. This includes adding a .shutdown callback to increase
> the power savings during S5.

Please split this into two separate changes.

May I also ask about the ->shutdown() callback and in relation to S5.
What makes the ->shutdown callback only being invoked for S5?

Kind regards
Uffe

>
> Signed-off-by: Al Cooper <alcooperx@...il.com>
> ---
>  drivers/mmc/host/Kconfig       |  2 +-
>  drivers/mmc/host/sdhci-iproc.c | 30 ++++++++++++++++++++++++++++++
>  drivers/mmc/host/sdhci.h       |  2 ++
>  3 files changed, 33 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index a4d4c757eea0..561184fa7eb9 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -412,7 +412,7 @@ config MMC_SDHCI_MILBEAUT
>
>  config MMC_SDHCI_IPROC
>         tristate "SDHCI support for the BCM2835 & iProc SD/MMC Controller"
> -       depends on ARCH_BCM2835 || ARCH_BCM_IPROC || COMPILE_TEST
> +       depends on ARCH_BCM2835 || ARCH_BCM_IPROC || ARCH_BRCMSTB || COMPILE_TEST
>         depends on MMC_SDHCI_PLTFM
>         depends on OF || ACPI
>         default ARCH_BCM_IPROC
> diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
> index ddeaf8e1f72f..cce390fe9cf3 100644
> --- a/drivers/mmc/host/sdhci-iproc.c
> +++ b/drivers/mmc/host/sdhci-iproc.c
> @@ -286,11 +286,35 @@ static const struct sdhci_iproc_data bcm2711_data = {
>         .mmc_caps = MMC_CAP_3_3V_DDR,
>  };
>
> +static const struct sdhci_pltfm_data sdhci_bcm7211a0_pltfm_data = {
> +       .quirks = SDHCI_QUIRK_MISSING_CAPS |
> +               SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
> +               SDHCI_QUIRK_BROKEN_DMA |
> +               SDHCI_QUIRK_BROKEN_ADMA,
> +       .ops = &sdhci_iproc_ops,
> +};
> +
> +#define BCM7211A0_BASE_CLK_MHZ 100
> +static const struct sdhci_iproc_data bcm7211a0_data = {
> +       .pdata = &sdhci_bcm7211a0_pltfm_data,
> +       .caps = ((BCM7211A0_BASE_CLK_MHZ / 2) << SDHCI_TIMEOUT_CLK_SHIFT) |
> +               (BCM7211A0_BASE_CLK_MHZ << SDHCI_CLOCK_BASE_SHIFT) |
> +               ((0x2 << SDHCI_MAX_BLOCK_SHIFT)
> +                       & SDHCI_MAX_BLOCK_MASK) |
> +               SDHCI_CAN_VDD_330 |
> +               SDHCI_CAN_VDD_180 |
> +               SDHCI_CAN_DO_SUSPEND |
> +               SDHCI_CAN_DO_HISPD,
> +       .caps1 = SDHCI_DRIVER_TYPE_C |
> +                SDHCI_DRIVER_TYPE_D,
> +};
> +
>  static const struct of_device_id sdhci_iproc_of_match[] = {
>         { .compatible = "brcm,bcm2835-sdhci", .data = &bcm2835_data },
>         { .compatible = "brcm,bcm2711-emmc2", .data = &bcm2711_data },
>         { .compatible = "brcm,sdhci-iproc-cygnus", .data = &iproc_cygnus_data},
>         { .compatible = "brcm,sdhci-iproc", .data = &iproc_data },
> +       { .compatible = "brcm,bcm7211a0-sdhci", .data = &bcm7211a0_data },
>         { }
>  };
>  MODULE_DEVICE_TABLE(of, sdhci_iproc_of_match);
> @@ -384,6 +408,11 @@ static int sdhci_iproc_probe(struct platform_device *pdev)
>         return ret;
>  }
>
> +static void sdhci_iproc_shutdown(struct platform_device *pdev)
> +{
> +       sdhci_pltfm_suspend(&pdev->dev);
> +}
> +
>  static struct platform_driver sdhci_iproc_driver = {
>         .driver = {
>                 .name = "sdhci-iproc",
> @@ -394,6 +423,7 @@ static struct platform_driver sdhci_iproc_driver = {
>         },
>         .probe = sdhci_iproc_probe,
>         .remove = sdhci_pltfm_unregister,
> +       .shutdown = sdhci_iproc_shutdown,
>  };
>  module_platform_driver(sdhci_iproc_driver);
>
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 0770c036e2ff..c35ed4be75b7 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -201,8 +201,10 @@
>
>  #define SDHCI_CAPABILITIES     0x40
>  #define  SDHCI_TIMEOUT_CLK_MASK                GENMASK(5, 0)
> +#define  SDHCI_TIMEOUT_CLK_SHIFT 0
>  #define  SDHCI_TIMEOUT_CLK_UNIT        0x00000080
>  #define  SDHCI_CLOCK_BASE_MASK         GENMASK(13, 8)
> +#define  SDHCI_CLOCK_BASE_SHIFT        8
>  #define  SDHCI_CLOCK_V3_BASE_MASK      GENMASK(15, 8)
>  #define  SDHCI_MAX_BLOCK_MASK  0x00030000
>  #define  SDHCI_MAX_BLOCK_SHIFT  16
> --
> 2.17.1
>