On 20/08/18 12:23, Aapo Vienamo wrote:
> Rerun the pad calibration procedure before sdhci_request() if
> the 100 ms recalibration interval has been exceeded.
>
> Signed-off-by: Aapo Vienamo <avienamo@xxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-tegra.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 94624ec..ef18a0c 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -30,6 +30,7 @@
> #include <linux/mmc/mmc.h>
> #include <linux/mmc/slot-gpio.h>
> #include <linux/gpio/consumer.h>
> +#include <linux/ktime.h>
>
> #include "sdhci-pltfm.h"
>
> @@ -122,6 +123,7 @@ struct sdhci_tegra {
> struct pinctrl_state *pinctrl_state_1v8;
>
> struct sdhci_tegra_autocal_offsets autocal_offsets;
> + ktime_t last_calib;
>
> u32 default_tap;
> u32 default_trim;
> @@ -533,6 +535,22 @@ static void tegra_sdhci_parse_pad_autocal_dt(struct sdhci_host *host)
> autocal->pull_down_hs400 = autocal->pull_down_1v8;
> }
>
> +static void tegra_sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
> +{
> + 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);
> + ktime_t since_calib = ktime_sub(ktime_get(), tegra_host->last_calib);
> +
> + /* 100 ms calibration interval is specified in the TRM */
> + if (ktime_to_ms(since_calib) > 100) {
> + tegra_sdhci_pad_autocalib(host);
> + tegra_host->last_calib = ktime_get();
> + }
> +
> + sdhci_request(mmc, mrq);
> +}
> +
> static void tegra_sdhci_parse_tap_and_trim(struct sdhci_host *host)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> @@ -1014,6 +1032,10 @@ static int sdhci_tegra_probe(struct platform_device *pdev)
> sdhci_tegra_start_signal_voltage_switch;
> }
>
> + /* Hook to periodically rerun pad calibration */
> + if (soc_data->nvquirks & NVQUIRK_HAS_PADCALIB)
> + host->mmc_host_ops.request = tegra_sdhci_request;
> +
> host->mmc_host_ops.hs400_enhanced_strobe =
> tegra_sdhci_hs400_enhanced_strobe;
>
>
