Marvell controller requires 1.8V bit in UHS control register 2
be set when doing UHS. eMMC does not require 1.8V for DDR.
add platform code to handle this.
Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
Reviewed-by: Arindam Nath <arindam.nath@xxxxxxx>
---
drivers/mmc/host/sdhci-pxa.c | 36 ++++++++++++++++++++++++++++++++++++
1 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/sdhci-pxa.c b/drivers/mmc/host/sdhci-pxa.c
index 5a61208..b52c3e6 100644
--- a/drivers/mmc/host/sdhci-pxa.c
+++ b/drivers/mmc/host/sdhci-pxa.c
@@ -69,7 +69,40 @@ static void set_clock(struct sdhci_host *host, unsigned int clock)
}
}
+static int set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
+{
+ u16 ctrl_2;
+
+ /*
+ * Set V18_EN -- UHS modes do not work without this.
+ * does not change signaling voltage
+ */
+ ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+ /* Select Bus Speed Mode for host */
+ ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
+ if (uhs == MMC_TIMING_UHS_SDR12)
+ ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
+ else if (uhs == MMC_TIMING_UHS_SDR25)
+ ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
+ else if (uhs == MMC_TIMING_UHS_SDR50) {
+ ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
+ ctrl_2 |= SDHCI_CTRL_VDD_180;
+ } else if (uhs == MMC_TIMING_UHS_SDR104) {
+ ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
+ ctrl_2 |= SDHCI_CTRL_VDD_180;
+ } else if (uhs == MMC_TIMING_UHS_DDR50) {
+ ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
+ ctrl_2 |= SDHCI_CTRL_VDD_180;
+ }
+ sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
+ pr_debug("%s:%s uhs = %d, ctrl_2 = %04X\n",
+ __func__, mmc_hostname(host->mmc), uhs, ctrl_2);
+ return 0;
+}
+
static struct sdhci_ops sdhci_pxa_ops = {
+ .set_uhs_signaling = set_uhs_signaling,
.set_clock = set_clock,
};
@@ -141,6 +174,9 @@ static int __devinit sdhci_pxa_probe(struct platform_device *pdev)
if (pdata->quirks)
host->quirks |= pdata->quirks;
+ /* enable 1/8V DDR capable */
+ host->mmc->caps |= MMC_CAP_1_8V_DDR;
+
/* If slot design supports 8 bit data, indicate this to MMC. */
if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
host->mmc->caps |= MMC_CAP_8_BIT_DATA;
--
1.7.1
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