set the callback for signaling voltage for Dual Data Rate. The controller requires V18_EN be set for DDR to work. The bit enables DDR but does not affect any signaling voltages. no mdelay is needed.
Signed-off-by: Philip Rakity <[email protected]> --- drivers/mmc/host/sdhci-pxa.c | 15 +++++++++++++++ 1 files changed, 15 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/host/sdhci-pxa.c b/drivers/mmc/host/sdhci-pxa.c index 5a61208..8f9a04e 100644 --- a/drivers/mmc/host/sdhci-pxa.c +++ b/drivers/mmc/host/sdhci-pxa.c @@ -69,8 +69,23 @@ static void set_clock(struct sdhci_host *host, unsigned int clock) } } +static unsigned int set_signaling_voltage(struct sdhci_host *host, + unsigned int ddr) +{ + u16 con; + /* + * 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 = { .set_clock = set_clock, + .set_signaling_voltage = set_signaling_voltage, }; /*****************************************************************************\ -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
