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From 3012bd5c49b1f0ce750767194f76e556fbe7e6e6 Mon Sep 17 00:00:00 2001
From: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Date: Thu, 15 Dec 2016 10:56:26 +0100
Subject: [PATCH 4/4] mmc: tegra: apalis-tk1: hack to make sd1 functional

Disable the external loopback and use the internal loopback as per
SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 bits being set to
0xfffd according to the TRM.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Dominik Sliwa <dominik.sliwa@toradex.com>

(cherry picked from toradex_tk1_l4t_r21.5 commit
fc14b7601e5ca587afd97936ef3fd599f4e9281c)

---

 drivers/mmc/host/sdhci-tegra.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 20b6ff5..6c84334 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -42,6 +42,7 @@
 #define SDHCI_MISC_CTRL_ENABLE_SDR50		0x10
 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300	0x20
 #define SDHCI_MISC_CTRL_ENABLE_DDR50		0x200
+#define SDHCI_MISC_CTRL_ENABLE_EXT_LOOPBACK	0x20000
 
 #define SDHCI_TEGRA_AUTO_CAL_CONFIG		0x1e4
 #define SDHCI_AUTO_CAL_START			BIT(31)
@@ -178,6 +179,16 @@ static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask)
 			clk_ctrl |= SDHCI_CLOCK_CTRL_SDR50_TUNING_OVERRIDE;
 	}
 
+#define CONFIG_MACH_APALIS_TK1
+#ifdef CONFIG_MACH_APALIS_TK1
+	/*
+	 * Disable the external loopback and use the internal loopback as per
+	 * SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 bits being set to
+	 * 0xfffd according to the TRM.
+	 */
+	misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_EXT_LOOPBACK;
+#endif /* CONFIG_MACH_APALIS_TK1 */
+
 	sdhci_writel(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
 	sdhci_writel(host, clk_ctrl, SDHCI_TEGRA_VENDOR_CLOCK_CTRL);
 
-- 
2.9.3