linux-kernel - Re: [PATCH] mmc: sdhci-cadence: set SDHCI_QUIRK2_PRESET_VALUE

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Date:   Tue, 17 Mar 2020 12:58:18 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: sdhci-cadence: set SDHCI_QUIRK2_PRESET_VALUE_BROKEN
 for UniPhier

On Thu, 12 Mar 2020 at 11:43, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> The SDHCI_PRESET_FOR_* registers are not set for the UniPhier platform
> integration. (They are all read as zeros).
>
> Set the SDHCI_QUIRK2_PRESET_VALUE_BROKEN quirk flag. Otherwise, the
> High Speed DDR mode on the eMMC controller (MMC_TIMING_MMC_DDR52)
> would not work.
>
> I split the platform data to give no impact to other platforms,
> although the UniPhier platform is currently only the upstream user
> of this IP.
>
> The SDHCI_QUIRK2_PRESET_VALUE_BROKEN flag is set if the compatible
> string matches to "socionext,uniphier-sd4hc".
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Applied for fixes and by adding a stable tag, thanks!

Kind regards
Uffe


> ---
>
>  drivers/mmc/host/sdhci-cadence.c | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
> index 5827d3751b81..e573495f8726 100644
> --- a/drivers/mmc/host/sdhci-cadence.c
> +++ b/drivers/mmc/host/sdhci-cadence.c
> @@ -11,6 +11,7 @@
>  #include <linux/mmc/host.h>
>  #include <linux/mmc/mmc.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>
>  #include "sdhci-pltfm.h"
>
> @@ -235,6 +236,11 @@ static const struct sdhci_ops sdhci_cdns_ops = {
>         .set_uhs_signaling = sdhci_cdns_set_uhs_signaling,
>  };
>
> +static const struct sdhci_pltfm_data sdhci_cdns_uniphier_pltfm_data = {
> +       .ops = &sdhci_cdns_ops,
> +       .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
> +};
> +
>  static const struct sdhci_pltfm_data sdhci_cdns_pltfm_data = {
>         .ops = &sdhci_cdns_ops,
>  };
> @@ -334,6 +340,7 @@ static void sdhci_cdns_hs400_enhanced_strobe(struct mmc_host *mmc,
>  static int sdhci_cdns_probe(struct platform_device *pdev)
>  {
>         struct sdhci_host *host;
> +       const struct sdhci_pltfm_data *data;
>         struct sdhci_pltfm_host *pltfm_host;
>         struct sdhci_cdns_priv *priv;
>         struct clk *clk;
> @@ -350,8 +357,12 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>         if (ret)
>                 return ret;
>
> +       data = of_device_get_match_data(dev);
> +       if (!data)
> +               data = &sdhci_cdns_pltfm_data;
> +
>         nr_phy_params = sdhci_cdns_phy_param_count(dev->of_node);
> -       host = sdhci_pltfm_init(pdev, &sdhci_cdns_pltfm_data,
> +       host = sdhci_pltfm_init(pdev, data,
>                                 struct_size(priv, phy_params, nr_phy_params));
>         if (IS_ERR(host)) {
>                 ret = PTR_ERR(host);
> @@ -431,7 +442,10 @@ static const struct dev_pm_ops sdhci_cdns_pm_ops = {
>  };
>
>  static const struct of_device_id sdhci_cdns_match[] = {
> -       { .compatible = "socionext,uniphier-sd4hc" },
> +       {
> +               .compatible = "socionext,uniphier-sd4hc",
> +               .data = &sdhci_cdns_uniphier_pltfm_data,
> +       },
>         { .compatible = "cdns,sd4hc" },
>         { /* sentinel */ }
>  };
> --
> 2.17.1
>