switch_voltage is required on some platform since special register accessing
Signed-off-by: Jorge A. Ramirez-Ortiz <jorge.ramirez-ortiz@xxxxxxxxxx>
Signed-off-by: Dan Yuan <yuandan@xxxxxxxxxxxxx>
Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
---
drivers/mmc/host/dw_mmc.c | 4 ++++
drivers/mmc/host/dw_mmc.h | 2 ++
2 files changed, 6 insertions(+)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 5f5adaf..ce66565 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -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
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index f45ab91..c723617 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -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_ */
--
1.9.1
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