On 20/05/20 11:08 pm, Sowjanya Komatineni 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@xxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> 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)
>
