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From 0a6205b902807ab567285048b5094bdbbca4d262 Mon Sep 17 00:00:00 2001
Message-Id: <0a6205b902807ab567285048b5094bdbbca4d262.1510580437.git.marcel.ziswiler@toradex.com>
In-Reply-To: <8d39626d07718220b426e9be045df8ed9d1fd707.1510580437.git.marcel.ziswiler@toradex.com>
References: <8d39626d07718220b426e9be045df8ed9d1fd707.1510580437.git.marcel.ziswiler@toradex.com>
From: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Date: Thu, 15 Dec 2016 10:56:26 +0100
Subject: [PATCH 5/8] 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 0cd6fa8..327883d 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -43,6 +43,7 @@
#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)
@@ -181,6 +182,16 @@ 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);
--
2.9.5
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