mmc: dw_mmc: Enable low-power mode for the card clock.

Setting this bit in the clock enable register will stop the clock
when the card is in the IDLE state.

Signed-off-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index c01cb86..cd6d821 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -562,7 +562,8 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot)
                             SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
 
                /* enable clock */
-               mci_writel(host, CLKENA, SDMMC_CLKEN_ENABLE);
+               mci_writel(host, CLKENA, SDMMC_CLKEN_ENABLE |
+                          SDMMC_CLKEN_LOW_PWR);
 
                /* inform CIU */
                mci_send_cmd(slot,