Re: [PATCH] sdhci: tegra: Avoid reading autocal timeout values when not applicable

[Ulf Hansson <ulf.hansson@linaro.org>]

On Wed, 20 May 2020 at 22:09, Sowjanya Komatineni
<skomatineni@nvidia.com> wrote:
>
> When auto calibration timeouts, calibration is disabled and fail-safe
> drive strength values are programmed based on the signal voltage.
>
> Different fail-safe drive strength values based on voltage are
> applicable only for SoCs supporting 3V3 and 1V8 pad controls.
>
> So, this patch avoids reading these properties from the device tree
> for SoCs not using pad controls and the warning of missing properties
> will not show up on these SoC platforms.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>

Applied for next and by fixing the misspelled "properies", thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/sdhci-tegra.c | 57 ++++++++++++++++++++++++------------------
>  1 file changed, 33 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 3e2c510..141b49b 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -605,6 +605,39 @@ static void tegra_sdhci_parse_pad_autocal_dt(struct sdhci_host *host)
>                 autocal->pull_down_1v8 = 0;
>
>         err = device_property_read_u32(host->mmc->parent,
> +                       "nvidia,pad-autocal-pull-up-offset-sdr104",
> +                       &autocal->pull_up_sdr104);
> +       if (err)
> +               autocal->pull_up_sdr104 = autocal->pull_up_1v8;
> +
> +       err = device_property_read_u32(host->mmc->parent,
> +                       "nvidia,pad-autocal-pull-down-offset-sdr104",
> +                       &autocal->pull_down_sdr104);
> +       if (err)
> +               autocal->pull_down_sdr104 = autocal->pull_down_1v8;
> +
> +       err = device_property_read_u32(host->mmc->parent,
> +                       "nvidia,pad-autocal-pull-up-offset-hs400",
> +                       &autocal->pull_up_hs400);
> +       if (err)
> +               autocal->pull_up_hs400 = autocal->pull_up_1v8;
> +
> +       err = device_property_read_u32(host->mmc->parent,
> +                       "nvidia,pad-autocal-pull-down-offset-hs400",
> +                       &autocal->pull_down_hs400);
> +       if (err)
> +               autocal->pull_down_hs400 = autocal->pull_down_1v8;
> +
> +       /*
> +        * Different fail-safe drive strength values based on the signaling
> +        * voltage are applicable for SoCs supporting 3V3 and 1V8 pad controls.
> +        * So, avoid reading below device tree properies for SoCs that don't
> +        * have NVQUIRK_NEEDS_PAD_CONTROL.
> +        */
> +       if (!(tegra_host->soc_data->nvquirks & NVQUIRK_NEEDS_PAD_CONTROL))
> +               return;
> +
> +       err = device_property_read_u32(host->mmc->parent,
>                         "nvidia,pad-autocal-pull-up-offset-3v3-timeout",
>                         &autocal->pull_up_3v3_timeout);
>         if (err) {
> @@ -647,30 +680,6 @@ static void tegra_sdhci_parse_pad_autocal_dt(struct sdhci_host *host)
>                                 mmc_hostname(host->mmc));
>                 autocal->pull_down_1v8_timeout = 0;
>         }
> -
> -       err = device_property_read_u32(host->mmc->parent,
> -                       "nvidia,pad-autocal-pull-up-offset-sdr104",
> -                       &autocal->pull_up_sdr104);
> -       if (err)
> -               autocal->pull_up_sdr104 = autocal->pull_up_1v8;
> -
> -       err = device_property_read_u32(host->mmc->parent,
> -                       "nvidia,pad-autocal-pull-down-offset-sdr104",
> -                       &autocal->pull_down_sdr104);
> -       if (err)
> -               autocal->pull_down_sdr104 = autocal->pull_down_1v8;
> -
> -       err = device_property_read_u32(host->mmc->parent,
> -                       "nvidia,pad-autocal-pull-up-offset-hs400",
> -                       &autocal->pull_up_hs400);
> -       if (err)
> -               autocal->pull_up_hs400 = autocal->pull_up_1v8;
> -
> -       err = device_property_read_u32(host->mmc->parent,
> -                       "nvidia,pad-autocal-pull-down-offset-hs400",
> -                       &autocal->pull_down_hs400);
> -       if (err)
> -               autocal->pull_down_hs400 = autocal->pull_down_1v8;
>  }
>
>  static void tegra_sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
> --
> 2.7.4
>