linux-kernel - Re: [PATCH v7 08/24] wfx: add bus

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Date:   Thu, 30 Sep 2021 12:07:55 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Jerome Pouiller <Jerome.Pouiller@...abs.com>
Cc:     linux-wireless <linux-wireless@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        driverdevel <devel@...verdev.osuosl.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        DTML <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Pali Rohár <pali@...nel.org>
Subject: Re: [PATCH v7 08/24] wfx: add bus_sdio.c

On Mon, 20 Sept 2021 at 18:12, Jerome Pouiller
<Jerome.Pouiller@...abs.com> wrote:
>
> From: Jérôme Pouiller <jerome.pouiller@...abs.com>
>
> Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
> ---
>  drivers/net/wireless/silabs/wfx/bus_sdio.c | 261 +++++++++++++++++++++
>  1 file changed, 261 insertions(+)
>  create mode 100644 drivers/net/wireless/silabs/wfx/bus_sdio.c
>
> diff --git a/drivers/net/wireless/silabs/wfx/bus_sdio.c b/drivers/net/wireless/silabs/wfx/bus_sdio.c

[...]

> +
> +static int wfx_sdio_probe(struct sdio_func *func,
> +                         const struct sdio_device_id *id)
> +{
> +       struct device_node *np = func->dev.of_node;
> +       struct wfx_sdio_priv *bus;
> +       int ret;
> +
> +       if (func->num != 1) {
> +               dev_err(&func->dev, "SDIO function number is %d while it should always be 1 (unsupported chip?)\n",
> +                       func->num);
> +               return -ENODEV;
> +       }
> +
> +       bus = devm_kzalloc(&func->dev, sizeof(*bus), GFP_KERNEL);
> +       if (!bus)
> +               return -ENOMEM;
> +
> +       if (!np || !of_match_node(wfx_sdio_of_match, np)) {
> +               dev_warn(&func->dev, "no compatible device found in DT\n");
> +               return -ENODEV;
> +       }
> +
> +       bus->func = func;
> +       bus->of_irq = irq_of_parse_and_map(np, 0);
> +       sdio_set_drvdata(func, bus);
> +       func->card->quirks |= MMC_QUIRK_LENIENT_FN0 |
> +                             MMC_QUIRK_BLKSZ_FOR_BYTE_MODE |
> +                             MMC_QUIRK_BROKEN_BYTE_MODE_512;

I would rather see that you add an SDIO_FIXUP for the SDIO card, to
the sdio_fixup_methods[], in drivers/mmc/core/quirks.h, instead of
this.

> +
> +       sdio_claim_host(func);
> +       ret = sdio_enable_func(func);
> +       /* Block of 64 bytes is more efficient than 512B for frame sizes < 4k */
> +       sdio_set_block_size(func, 64);
> +       sdio_release_host(func);
> +       if (ret)
> +               return ret;
> +
> +       bus->core = wfx_init_common(&func->dev, &wfx_sdio_pdata,
> +                                   &wfx_sdio_hwbus_ops, bus);
> +       if (!bus->core) {
> +               ret = -EIO;
> +               goto sdio_release;
> +       }
> +
> +       ret = wfx_probe(bus->core);
> +       if (ret)
> +               goto sdio_release;
> +
> +       return 0;
> +
> +sdio_release:
> +       sdio_claim_host(func);
> +       sdio_disable_func(func);
> +       sdio_release_host(func);
> +       return ret;
> +}
> +
> +static void wfx_sdio_remove(struct sdio_func *func)
> +{
> +       struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
> +
> +       wfx_release(bus->core);
> +       sdio_claim_host(func);
> +       sdio_disable_func(func);
> +       sdio_release_host(func);
> +}
> +
> +static const struct sdio_device_id wfx_sdio_ids[] = {
> +       { SDIO_DEVICE(SDIO_VENDOR_ID_SILABS, SDIO_DEVICE_ID_SILABS_WF200) },
> +       { },
> +};
> +MODULE_DEVICE_TABLE(sdio, wfx_sdio_ids);
> +
> +struct sdio_driver wfx_sdio_driver = {
> +       .name = "wfx-sdio",
> +       .id_table = wfx_sdio_ids,
> +       .probe = wfx_sdio_probe,
> +       .remove = wfx_sdio_remove,
> +       .drv = {
> +               .owner = THIS_MODULE,
> +               .of_match_table = wfx_sdio_of_match,

Is there no power management? Or do you intend to add that on top?

> +       }
> +};
> --
> 2.33.0
>

Kind regards
Uffe