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Date: Thu, 30 Aug 2018 18:06:13 +0300 From: Aapo Vienamo <avienamo@...dia.com> To: Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com>, Thierry Reding <thierry.reding@...il.com>, Jonathan Hunter <jonathanh@...dia.com>, Ulf Hansson <ulf.hansson@...aro.org>, Adrian Hunter <adrian.hunter@...el.com>, Mikko Perttunen <mperttunen@...dia.com>, Stefan Agner <stefan@...er.ch> CC: <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>, Aapo Vienamo <avienamo@...dia.com> Subject: [PATCH v3 12/38] mmc: tegra: Poll for calibration completion Implement polling with 10 ms timeout for automatic pad drive strength calibration. Signed-off-by: Aapo Vienamo <avienamo@...dia.com> Acked-by: Thierry Reding <treding@...dia.com> --- drivers/mmc/host/sdhci-tegra.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c index 11185e96f3c3..56b637c5b594 100644 --- a/drivers/mmc/host/sdhci-tegra.c +++ b/drivers/mmc/host/sdhci-tegra.c @@ -16,6 +16,7 @@ #include <linux/err.h> #include <linux/module.h> #include <linux/init.h> +#include <linux/iopoll.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/io.h> @@ -50,6 +51,9 @@ #define SDHCI_AUTO_CAL_START BIT(31) #define SDHCI_AUTO_CAL_ENABLE BIT(29) +#define SDHCI_TEGRA_AUTO_CAL_STATUS 0x1ec +#define SDHCI_TEGRA_AUTO_CAL_ACTIVE BIT(31) + #define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0) #define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1) #define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2) @@ -226,13 +230,21 @@ static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask) static void tegra_sdhci_pad_autocalib(struct sdhci_host *host) { - u32 val; + u32 reg; + int ret; + + reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG); + reg |= SDHCI_AUTO_CAL_ENABLE | SDHCI_AUTO_CAL_START; + sdhci_writel(host, reg, SDHCI_TEGRA_AUTO_CAL_CONFIG); - mdelay(1); + usleep_range(1, 2); + /* 10 ms timeout */ + ret = readl_poll_timeout(host->ioaddr + SDHCI_TEGRA_AUTO_CAL_STATUS, + reg, !(reg & SDHCI_TEGRA_AUTO_CAL_ACTIVE), + 1000, 10000); - val = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG); - val |= SDHCI_AUTO_CAL_ENABLE | SDHCI_AUTO_CAL_START; - sdhci_writel(host,val, SDHCI_TEGRA_AUTO_CAL_CONFIG); + if (ret) + dev_err(mmc_dev(host->mmc), "Pad autocal timed out\n"); } static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock) -- 2.18.0
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