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Commit 8f7849c4 authored by Zhangfei Gao's avatar Zhangfei Gao Committed by Ulf Hansson
Browse files

mmc: dw_mmc: add switch_voltage 



switch_voltage is required on some platform since special register accessing

Signed-off-by: default avatarJorge A. Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: default avatarDan Yuan <yuandan@hisilicon.com>
Signed-off-by: default avatarZhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: default avatarJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent d9c7eb38

drivers/mmc/host/dw_mmc.c

+4 −0
Original line number Diff line number Diff line
@@ -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

drivers/mmc/host/dw_mmc.h

+2 −0
Original line number Diff line number Diff line
@@ -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_ */