controller needs to have 1.8V signaling voltage bit set
even if not doing 1.8V signaling for DDR to work.
The bit does not change the i/o signaling voltage
Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
---
drivers/mmc/host/sdhci-pxa.c | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/sdhci-pxa.c b/drivers/mmc/host/sdhci-pxa.c
index 3d01f94..8527ac1 100644
--- a/drivers/mmc/host/sdhci-pxa.c
+++ b/drivers/mmc/host/sdhci-pxa.c
@@ -101,8 +101,25 @@ static unsigned int get_f_max_clock(struct sdhci_host *host)
return pxa->pdata->max_speed;
}
+static unsigned int set_signaling_voltage(struct sdhci_host *host,
+ unsigned int ddr)
+{
+ u16 con;
+
+ pr_debug("%s:%s\n", __func__, mmc_hostname(host->mmc));
+ /*
+ * Set V18_EN -- DDR does not work without this.
+ * does not change signaling voltage
+ */
+ con = readw(host->ioaddr + SDHCI_HOST_CONTROL_2);
+ con |= SDCTRL_2_SDH_V18_EN;
+ writew(con, host->ioaddr + SDHCI_HOST_CONTROL_2);
+ return 0;
+}
+
static struct sdhci_ops sdhci_pxa_ops = {
.platform_reset_exit = platform_reset_exit,
+ .set_signaling_voltage = set_signaling_voltage,
.get_f_max_clock = NULL,
};
--
1.7.0.4
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