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 <[email protected]>
Acked-by: Adrian Hunter <[email protected]> > --- > 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; > >
