From ba49cbd0936e12eac245c0fb420a291e8505f639 Mon Sep 17 00:00:00 2001 From: yangbo lu Date: Thu, 20 Apr 2017 16:14:42 +0800 Subject: [PATCH] mmc: sdhci-of-esdhc: add tuning support eSDHC uses tuning block for tuning procedure. So the tuning block control register must be configured properly before tuning. Signed-off-by: Yangbo Lu Acked-by: Adrian Hunter Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci-esdhc.h | 5 +++++ drivers/mmc/host/sdhci-of-esdhc.c | 20 ++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/drivers/mmc/host/sdhci-esdhc.h b/drivers/mmc/host/sdhci-esdhc.h index 68695679fed5..c4bbd7485987 100644 --- a/drivers/mmc/host/sdhci-esdhc.h +++ b/drivers/mmc/host/sdhci-esdhc.h @@ -53,9 +53,14 @@ #define ESDHC_CLOCK_HCKEN 0x00000002 #define ESDHC_CLOCK_IPGEN 0x00000001 +/* Tuning Block Control Register */ +#define ESDHC_TBCTL 0x120 +#define ESDHC_TB_EN 0x00000004 + /* Control Register for DMA transfer */ #define ESDHC_DMA_SYSCTL 0x40c #define ESDHC_PERIPHERAL_CLK_SEL 0x00080000 +#define ESDHC_FLUSH_ASYNC_FIFO 0x00040000 #define ESDHC_DMA_SNOOP 0x00000040 #endif /* _DRIVERS_MMC_SDHCI_ESDHC_H */ diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c index f2d7002e37c1..607e5122e1a1 100644 --- a/drivers/mmc/host/sdhci-of-esdhc.c +++ b/drivers/mmc/host/sdhci-of-esdhc.c @@ -631,6 +631,25 @@ static int esdhc_signal_voltage_switch(struct mmc_host *mmc, } } +static int esdhc_execute_tuning(struct mmc_host *mmc, u32 opcode) +{ + struct sdhci_host *host = mmc_priv(mmc); + u32 val; + + /* Use tuning block for tuning procedure */ + esdhc_clock_enable(host, false); + val = sdhci_readl(host, ESDHC_DMA_SYSCTL); + val |= ESDHC_FLUSH_ASYNC_FIFO; + sdhci_writel(host, val, ESDHC_DMA_SYSCTL); + + val = sdhci_readl(host, ESDHC_TBCTL); + val |= ESDHC_TB_EN; + sdhci_writel(host, val, ESDHC_TBCTL); + esdhc_clock_enable(host, true); + + return sdhci_execute_tuning(mmc, opcode); +} + #ifdef CONFIG_PM_SLEEP static u32 esdhc_proctl; static int esdhc_of_suspend(struct device *dev) @@ -790,6 +809,7 @@ static int sdhci_esdhc_probe(struct platform_device *pdev) host->mmc_host_ops.start_signal_voltage_switch = esdhc_signal_voltage_switch; + host->mmc_host_ops.execute_tuning = esdhc_execute_tuning; esdhc_init(pdev, host); -- 2.20.1