From: Aapo Vienamo <avienamo@nvidia.com> To: Adrian Hunter <adrian.hunter@intel.com>, Ulf Hansson <ulf.hansson@linaro.org>, Thierry Reding <thierry.reding@gmail.com>, Jonathan Hunter <jonathanh@nvidia.com> Cc: linux-mmc@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, Aapo Vienamo <avienamo@nvidia.com> Subject: [PATCH 2/2] mmc: tegra: Implement periodic pad calibration Date: Mon, 20 Aug 2018 12:23:33 +0300 [thread overview] Message-ID: <1534757013-4524-3-git-send-email-avienamo@nvidia.com> (raw) In-Reply-To: <1534757013-4524-1-git-send-email-avienamo@nvidia.com> Rerun the pad calibration procedure before sdhci_request() if the 100 ms recalibration interval has been exceeded. Signed-off-by: Aapo Vienamo <avienamo@nvidia.com> --- 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; -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Aapo Vienamo <avienamo@nvidia.com> To: Adrian Hunter <adrian.hunter@intel.com>, Ulf Hansson <ulf.hansson@linaro.org>, Thierry Reding <thierry.reding@gmail.com>, "Jonathan Hunter" <jonathanh@nvidia.com> Cc: <linux-mmc@vger.kernel.org>, <linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>, Aapo Vienamo <avienamo@nvidia.com> Subject: [PATCH 2/2] mmc: tegra: Implement periodic pad calibration Date: Mon, 20 Aug 2018 12:23:33 +0300 [thread overview] Message-ID: <1534757013-4524-3-git-send-email-avienamo@nvidia.com> (raw) In-Reply-To: <1534757013-4524-1-git-send-email-avienamo@nvidia.com> Rerun the pad calibration procedure before sdhci_request() if the 100 ms recalibration interval has been exceeded. Signed-off-by: Aapo Vienamo <avienamo@nvidia.com> --- 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; -- 2.7.4
next prev parent reply other threads:[~2018-08-20 9:23 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-08-20 9:23 [PATCH 0/2] Tegra SDHCI rerun pad calibration periodically Aapo Vienamo 2018-08-20 9:23 ` Aapo Vienamo 2018-08-20 9:23 ` [PATCH 1/2] mmc: sdhci: Export sdhci_request() Aapo Vienamo 2018-08-20 9:23 ` Aapo Vienamo 2018-08-22 10:54 ` Adrian Hunter 2018-08-27 10:07 ` Ulf Hansson 2018-08-27 10:11 ` Thierry Reding 2018-08-20 9:23 ` Aapo Vienamo [this message] 2018-08-20 9:23 ` [PATCH 2/2] mmc: tegra: Implement periodic pad calibration Aapo Vienamo 2018-08-22 10:56 ` Adrian Hunter 2018-08-31 14:00 ` Thierry Reding 2018-09-03 6:14 ` Ulf Hansson 2018-08-23 8:50 ` [PATCH 0/2] Tegra SDHCI rerun pad calibration periodically Thierry Reding 2018-08-27 9:55 ` Ulf Hansson
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