mmc: tegra: disable UHS modes

Program TEGRA_SDHCI_VENDOR_MISC_CTRL so that UHS modes aren't advertised
in SDHCI_CAPABILITIES_1.  While the Tegra SDHCI controller does support
these modes, they require Tegra-specific tuning and calibration routines
which the driver does not support yet.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>

1 files changed, 23 insertions, 7 deletions

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 985247649f46..4375cd4704c6 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -32,11 +32,17 @@
 
 /* Tegra SDHOST controller vendor register definitions */
 #define SDHCI_TEGRA_VENDOR_MISC_CTRL            0x120
+#define SDHCI_MISC_CTRL_ENABLE_SDR104           0x8
+#define SDHCI_MISC_CTRL_ENABLE_SDR50            0x10
 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300   0x20
+#define SDHCI_MISC_CTRL_ENABLE_DDR50            0x200
 
 #define NVQUIRK_FORCE_SDHCI_SPEC_200    BIT(0)
 #define NVQUIRK_ENABLE_BLOCK_GAP_DET    BIT(1)
 #define NVQUIRK_ENABLE_SDHCI_SPEC_300   BIT(2)
+#define NVQUIRK_DISABLE_SDR50           BIT(3)
+#define NVQUIRK_DISABLE_SDR104          BIT(4)
+#define NVQUIRK_DISABLE_DDR50           BIT(5)
 
 struct sdhci_tegra_soc_data {
         const struct sdhci_pltfm_data *pdata;
@@ -100,20 +106,25 @@ 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;
 
         sdhci_reset(host, mask);
 
         if (!(mask & SDHCI_RESET_ALL))
                 return;
 
+        misc_ctrl = sdhci_readw(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
         /* Erratum: Enable SDHCI spec v3.00 support */
-        if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300) {
-                u32 misc_ctrl;
-
-                misc_ctrl = sdhci_readb(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
+        if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300)
                 misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300;
-                sdhci_writeb(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
-        }
+        /* Don't advertise UHS modes which aren't supported yet */
+        if (soc_data->nvquirks & NVQUIRK_DISABLE_SDR50)
+                misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR50;
+        if (soc_data->nvquirks & NVQUIRK_DISABLE_DDR50)
+                misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_DDR50;
+        if (soc_data->nvquirks & NVQUIRK_DISABLE_SDR104)
+                misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR104;
+        sdhci_writew(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
 }
 
 static void tegra_sdhci_set_bus_width(struct sdhci_host *host, int bus_width)
@@ -170,7 +181,9 @@ static const struct sdhci_pltfm_data sdhci_tegra30_pdata = {
 
 static struct sdhci_tegra_soc_data soc_data_tegra30 = {
         .pdata = &sdhci_tegra30_pdata,
-        .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300,
+        .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300 |
+                    NVQUIRK_DISABLE_SDR50 |
+                    NVQUIRK_DISABLE_SDR104,
 };
 
 static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
@@ -184,6 +197,9 @@ static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
 
 static struct sdhci_tegra_soc_data soc_data_tegra114 = {
         .pdata = &sdhci_tegra114_pdata,
+        .nvquirks = NVQUIRK_DISABLE_SDR50 |
+                    NVQUIRK_DISABLE_DDR50 |
+                    NVQUIRK_DISABLE_SDR104,
 };
 
 static const struct of_device_id sdhci_tegra_dt_match[] = {