linux-kernel - Re: [PATCH V12 20/23] mmc: sdhci-uhs2: add add

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Date:   Thu, 5 Oct 2023 13:38:29 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Victor Shih <victorshihgli@...il.com>
Cc:     adrian.hunter@...el.com, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, benchuanggli@...il.com,
        HL.Liu@...esyslogic.com.tw, Greg.tu@...esyslogic.com.tw,
        takahiro.akashi@...aro.org, dlunev@...omium.org,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: Re: [PATCH V12 20/23] mmc: sdhci-uhs2: add add_host() and others to
 set up the driver

On Fri, 15 Sept 2023 at 11:44, Victor Shih <victorshihgli@...il.com> wrote:
>
> From: Victor Shih <victor.shih@...esyslogic.com.tw>
>
> This is a UHS-II version of sdhci's add_host/remove_host operation.
> Any sdhci drivers which are capable of handling UHS-II cards must
> call those functions instead of the corresponding sdhci's.
>
> Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>

[...]

Just a few nitpicks, see below.

> +static void __sdhci_uhs2_add_host_v4(struct sdhci_host *host, u32 caps1)
> +{
> +       struct mmc_host *mmc;
> +       u32 max_current_caps2;
> +
> +       mmc = host->mmc;
> +
> +       /* Support UHS2 */
> +       if (caps1 & SDHCI_SUPPORT_UHS2)
> +               mmc->caps2 |= MMC_CAP2_SD_UHS2;
> +
> +       max_current_caps2 = sdhci_readl(host, SDHCI_MAX_CURRENT_1);
> +
> +       if ((caps1 & SDHCI_CAN_VDD2_180) &&
> +           !max_current_caps2 &&
> +           !IS_ERR(mmc->supply.vmmc2)) {
> +               /* UHS2 - VDD2 */
> +               int curr = regulator_get_current_limit(mmc->supply.vmmc2);

As I also stated in another reply, please use vqmmc2 instead, which we
added in patch4.

> +
> +               if (curr > 0) {
> +                       /* convert to SDHCI_MAX_CURRENT format */
> +                       curr = curr / 1000;  /* convert to mA */
> +                       curr = curr / SDHCI_MAX_CURRENT_MULTIPLIER;
> +                       curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
> +                       max_current_caps2 = curr;
> +               }
> +       }
> +
> +       if (!(caps1 & SDHCI_CAN_VDD2_180))
> +               mmc->caps2 &= ~MMC_CAP2_SD_UHS2;
> +}
> +
> +static int sdhci_uhs2_host_ops_init(struct sdhci_host *host);

Please try to re-order the code so this declaration isn't needed.

> +
> +static void __sdhci_uhs2_remove_host(struct sdhci_host *host, int dead)
> +{
> +       if (!sdhci_uhs2_mode(host))
> +               return;
> +
> +       if (!dead)
> +               sdhci_uhs2_reset(host, SDHCI_UHS2_SW_RESET_FULL);
> +}
> +

[...]

Kind regards
Uffe