This patch reads the capabilities register1 and update the host
caps accordingly for mmc layer usage. This patch mainly reads
for UHS capabilities inorder to support SD3.0.
Signed-off-by: Siva Durga Prasad Paladugu <siva...@xilinx.com>
---
drivers/mmc/sdhci.c | 28 +++++++++++++++++++++++++++-
include/sdhci.h | 6 ++++++
2 files changed, 33 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 2c3dcd4..2b7bec0 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -559,7 +559,7 @@ static const struct mmc_ops sdhci_ops = {
int sdhci_setup_cfg(struct mmc_config *cfg, struct sdhci_host *host,
u32 f_max, u32 f_min)
{
- u32 caps, caps_1;
+ u32 caps, caps_1 = 0;
caps = sdhci_readl(host, SDHCI_CAPABILITIES);
@@ -635,6 +635,32 @@ int sdhci_setup_cfg(struct mmc_config *cfg, struct
sdhci_host *host,
cfg->host_caps &= ~MMC_MODE_8BIT;
}
+ if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
+ caps_1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
+
+ if (!(cfg->voltages & MMC_VDD_165_195) ||
+ (host->quirks & SDHCI_QUIRK_NO_1_8_V))
+ caps_1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
+ SDHCI_SUPPORT_DDR50);
+
+ if (caps_1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
+ SDHCI_SUPPORT_DDR50))
+ cfg->host_caps |= MMC_CAP(UHS_SDR12) | MMC_CAP(UHS_SDR25);
+
+ if (caps_1 & SDHCI_SUPPORT_SDR104) {
+ cfg->host_caps |= MMC_CAP(UHS_SDR104) | MMC_CAP(UHS_SDR50);
+ /*
+ * SD3.0: SDR104 is supported so (for eMMC) the caps2
+ * field can be promoted to support HS200.
+ */
+ cfg->host_caps |= MMC_CAP(MMC_HS_200);
+ } else if (caps_1 & SDHCI_SUPPORT_SDR50) {
+ cfg->host_caps |= MMC_CAP(UHS_SDR50);
+ }
+
+ if (caps_1 & SDHCI_SUPPORT_DDR50)
+ cfg->host_caps |= MMC_CAP(UHS_DDR50);
+
if (host->host_caps)
cfg->host_caps |= host->host_caps;
diff --git a/include/sdhci.h b/include/sdhci.h
index 3269992..289042f 100644
--- a/include/sdhci.h
+++ b/include/sdhci.h
@@ -167,6 +167,11 @@
#define SDHCI_CAN_64BIT BIT(28)
#define SDHCI_CAPABILITIES_1 0x44
+#define SDHCI_SUPPORT_SDR50 0x00000001
+#define SDHCI_SUPPORT_SDR104 0x00000002
+#define SDHCI_SUPPORT_DDR50 0x00000004
+#define SDHCI_USE_SDR50_TUNING 0x00002000
+
#define SDHCI_CLOCK_MUL_MASK 0x00FF0000
#define SDHCI_CLOCK_MUL_SHIFT 16
@@ -215,6 +220,7 @@
#define SDHCI_QUIRK_BROKEN_VOLTAGE (1 << 4)
#define SDHCI_QUIRK_WAIT_SEND_CMD (1 << 6)
#define SDHCI_QUIRK_USE_WIDE8 (1 << 8)
+#define SDHCI_QUIRK_NO_1_8_V (1 << 9)
/* to make gcc happy */
struct sdhci_host;
--
2.7.4
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