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...@nxp.com>
---
Changes for v2:
- None.
---
drivers/mmc/mmc-uclass.c | 15 +++++++++++++++
drivers/mmc/mmc.c | 2 ++
include/mmc.h | 15 ++++++++++++++-
3 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index b9f0880..240b205 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -141,6 +141,21 @@ 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);
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index a18e75d..e396207 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1987,6 +1987,8 @@ static int mmc_select_hs400(struct mmc *mmc)
/* Set back to HS */
mmc_set_card_speed(mmc, MMC_HS, true);
+ mmc_hs400_prepare_ddr(mmc);
+
err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_FLAG);
if (err)
diff --git a/include/mmc.h b/include/mmc.h
index 2399cc2..659df75 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -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 {
--
2.7.4
