Commit 61dad40e authored by Aapo Vienamo's avatar Aapo Vienamo Committed by Ulf Hansson

mmc: tegra: Implement periodic pad calibration

Rerun the pad calibration procedure before sdhci_request() if
the 100 ms recalibration interval has been exceeded.
Signed-off-by: default avatarAapo Vienamo <avienamo@nvidia.com>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Acked-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent bc5568bf
......@@ -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;
......@@ -555,6 +557,22 @@ 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);
......@@ -1045,6 +1063,10 @@ 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;
......
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