linux-kernel - Re: [PATCH 09/10] mmc: tegra: Perform pad calibration after voltage switch

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Date:   Wed, 25 Jul 2018 10:25:16 +0300
From:   Mikko Perttunen <cyndis@...si.fi>
To:     Aapo Vienamo <avienamo@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Mikko Perttunen <mperttunen@...dia.com>
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] mmc: tegra: Perform pad calibration after voltage
 switch



On 24.07.2018 17:34, Aapo Vienamo wrote:
> Run the automatic pad calibration after voltage switching if
> tegra_host->pad_calib_required is set.
> 
> Signed-off-by: Aapo Vienamo <avienamo@...dia.com>
> ---
>   drivers/mmc/host/sdhci-tegra.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 78781bd..529aa4e7 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -537,6 +537,8 @@ static int sdhci_tegra_start_signal_voltage_switch(struct mmc_host *mmc,
>   						   struct mmc_ios *ios)
>   {
>   	struct sdhci_host *host = mmc_priv(mmc);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
>   	int ret = 0;
>   
>   	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
> @@ -551,6 +553,9 @@ static int sdhci_tegra_start_signal_voltage_switch(struct mmc_host *mmc,
>   		ret = tegra_sdhci_set_padctrl(host, ios->signal_voltage);
>   	}
>   
> +	if (tegra_host->pad_calib_required)
> +		tegra_sdhci_pad_autocalib(host);

What if the autocalibration fails? Should we return an error?

> +
>   	return ret;
>   }
>   
>