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

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

drivers/mmc/host/sdhci-tegra.c

+22 −0
Original line number Diff line number Diff line
@@ -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;