mmc: tegra: disable SPI_MODE_CLKEN

The Tegra30 and up TRM states that this bit should always be
programmed to 0 by driver software.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-tegra.c

@@ -28,6 +28,10 @@
 #include "sdhci-pltfm.h"
 
 /* Tegra SDHOST controller vendor register definitions */
+#define SDHCI_TEGRA_VENDOR_CLOCK_CTRL			0x100
+#define SDHCI_CLOCK_CTRL_PADPIPE_CLKEN_OVERRIDE		BIT(3)
+#define SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE	BIT(2)
+
 #define SDHCI_TEGRA_VENDOR_MISC_CTRL		0x120
 #define SDHCI_MISC_CTRL_ENABLE_SDR104		0x8
 #define SDHCI_MISC_CTRL_ENABLE_SDR50		0x10
@@ -125,7 +129,7 @@ static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask)
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_tegra *tegra_host = pltfm_host->priv;
 	const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
-	u32 misc_ctrl;
+	u32 misc_ctrl, clk_ctrl;
 
 	sdhci_reset(host, mask);
 
@@ -145,6 +149,10 @@ static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask)
 		misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR104;
 	sdhci_writew(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
 
+	clk_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL);
+	clk_ctrl &= ~SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE;
+	sdhci_writel(host, clk_ctrl, SDHCI_TEGRA_VENDOR_CLOCK_CTRL);
+
 	tegra_host->ddr_signaling = false;
 }