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mmc: dw_mmc: add switch_voltage

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switch_voltage is required on some platform since special register accessing

Signed-off-by: Jorge A. Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Dan Yuan <yuandan@hisilicon.com>
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Zhangfei Gao 2015-05-14 16:45:18 +08:00 committed by Ulf Hansson
parent d9c7eb3895
commit 8f7849c4f9
2 changed files with 6 additions and 0 deletions
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4
drivers/mmc/host/dw_mmc.c
View File

@ -1236,11 +1236,15 @@ static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct dw_mci_slot *slot = mmc_priv(mmc);
struct dw_mci *host = slot->host;
const struct dw_mci_drv_data *drv_data = host->drv_data;
u32 uhs;
u32 v18 = SDMMC_UHS_18V << slot->id;
int min_uv, max_uv;
int ret;
if (drv_data && drv_data->switch_voltage)
return drv_data->switch_voltage(mmc, ios);
/*
* Program the voltage. Note that some instances of dw_mmc may use
* the UHS_REG for this. For other instances (like exynos) the UHS_REG

2
drivers/mmc/host/dw_mmc.h
View File

@ -287,5 +287,7 @@ struct dw_mci_drv_data {
int (*execute_tuning)(struct dw_mci_slot *slot);
int (*prepare_hs400_tuning)(struct dw_mci *host,
struct mmc_ios *ios);
int (*switch_voltage)(struct mmc_host *mmc,
struct mmc_ios *ios);
};
#endif /* _DW_MMC_H_ */