mmc: tegra: support SDHCI SPEC 300
Tegra3 SDHOST controller doesn't advertise v3.00 support by default.
This support has to be enabled by configuring a vendor register in
the tegra3 sd host address space.
Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 53b2650..cff0c52 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -32,8 +32,13 @@
#include "sdhci-pltfm.h"
+/* Tegra SDHOST controller vendor register definitions */
+#define SDHCI_TEGRA_VENDOR_MISC_CTRL 0x120
+#define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20
+
#define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0)
#define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1)
+#define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2)
struct sdhci_tegra_soc_data {
struct sdhci_pltfm_data *pdata;
@@ -120,6 +125,25 @@
return IRQ_HANDLED;
};
+static void tegra_sdhci_reset_exit(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;
+
+ if (!(mask & SDHCI_RESET_ALL))
+ return;
+
+ /* 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);
+ misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300;
+ sdhci_writeb(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
+ }
+}
+
static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -148,6 +172,7 @@
.read_w = tegra_sdhci_readw,
.write_l = tegra_sdhci_writel,
.platform_8bit_width = tegra_sdhci_8bit,
+ .platform_reset_exit = tegra_sdhci_reset_exit,
};
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
@@ -178,6 +203,7 @@
static struct sdhci_tegra_soc_data soc_data_tegra30 = {
.pdata = &sdhci_tegra30_pdata,
+ .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300,
};
#endif