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mmc: add a mmc_hs400_prepare_ddr() interface

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Add a mmc_hs400_prepare_ddr() interface for controllers
which needs preparation before switching to DDR mode for
HS400 mode.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
This commit is contained in:
Yangbo Lu
2020-09-01 16:58:04 +08:00
committed by Peng Fan
parent 8c96880814
commit d271e10581
3 changed files with 33 additions and 1 deletions
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15
drivers/mmc/mmc-uclass.c
View File

@@ -142,6 +142,21 @@ int mmc_set_enhanced_strobe(struct mmc *mmc)
}
#endif
int dm_mmc_hs400_prepare_ddr(struct udevice *dev)
{
struct dm_mmc_ops *ops = mmc_get_ops(dev);
if (ops->hs400_prepare_ddr)
return ops->hs400_prepare_ddr(dev);
return 0;
}
int mmc_hs400_prepare_ddr(struct mmc *mmc)
{
return dm_mmc_hs400_prepare_ddr(mmc->dev);
}
int dm_mmc_host_power_cycle(struct udevice *dev)
{
struct dm_mmc_ops *ops = mmc_get_ops(dev);

4
drivers/mmc/mmc.c
View File

@@ -1993,6 +1993,10 @@ static int mmc_select_hs400(struct mmc *mmc)
/* Set back to HS */
mmc_set_card_speed(mmc, MMC_HS, true);
err = mmc_hs400_prepare_ddr(mmc);
if (err)
return err;
err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_FLAG);
if (err)

15
include/mmc.h
View File

@@ -513,6 +513,14 @@ struct dm_mmc_ops {
* @return maximum number of blocks for this transfer
*/
int (*get_b_max)(struct udevice *dev, void *dst, lbaint_t blkcnt);
/**
* hs400_prepare_ddr - prepare to switch to DDR mode
*
* @dev: Device to check
* @return 0 if success, -ve on error
*/
int (*hs400_prepare_ddr)(struct udevice *dev);
};
#define mmc_get_ops(dev) ((struct dm_mmc_ops *)(dev)->driver->ops)
@@ -540,7 +548,7 @@ int mmc_host_power_cycle(struct mmc *mmc);
int mmc_deferred_probe(struct mmc *mmc);
int mmc_reinit(struct mmc *mmc);
int mmc_get_b_max(struct mmc *mmc, void *dst, lbaint_t blkcnt);
int mmc_hs400_prepare_ddr(struct mmc *mmc);
#else
struct mmc_ops {
int (*send_cmd)(struct mmc *mmc,
@@ -552,6 +560,11 @@ struct mmc_ops {
int (*host_power_cycle)(struct mmc *mmc);
int (*get_b_max)(struct mmc *mmc, void *dst, lbaint_t blkcnt);
};
static inline int mmc_hs400_prepare_ddr(struct mmc *mmc)
{
return 0;
}
#endif
struct mmc_config {