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mmc: dw_mmc: disable biu clk if possible 

We could disable biu clk if gpio card detect available,
or it is a non-removable device.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shawn Lin 2016-10-12 10:50:38 +08:00 committed by Ulf Hansson
parent 50fcbbbb79
commit 1f5c51d76e
2 changed files with 14 additions and 0 deletions
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1
drivers/mmc/host/dw_mmc-rockchip.c
View File

@ -13,6 +13,7 @@
#include <linux/mmc/host.h>
#include <linux/mmc/dw_mmc.h>
#include <linux/of_address.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>

13
drivers/mmc/host/dw_mmc.c
View File

@ -3337,6 +3337,11 @@ int dw_mci_runtime_suspend(struct device *dev)
clk_disable_unprepare(host->ciu_clk);
if (host->cur_slot &&
(mmc_can_gpio_cd(host->cur_slot->mmc) ||
!mmc_card_is_removable(host->cur_slot->mmc)))
clk_disable_unprepare(host->biu_clk);
return err;
}
EXPORT_SYMBOL(dw_mci_runtime_suspend);
@ -3346,6 +3351,14 @@ int dw_mci_runtime_resume(struct device *dev)
int ret = 0;
struct dw_mci *host = dev_get_drvdata(dev);
if (host->cur_slot &&
(mmc_can_gpio_cd(host->cur_slot->mmc) ||
!mmc_card_is_removable(host->cur_slot->mmc))) {
ret = clk_prepare_enable(host->biu_clk);
if (ret)
return ret;
}
ret = clk_prepare_enable(host->ciu_clk);
if (ret)
return ret;