[v4, 01/11] mmc: add a reinit() API

[Yangbo Lu <yangbo.lu@nxp.com>]

For DM_MMC, the controller re-initialization is needed to
clear old configuration for mmc rescan.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
---
Changes for v2:
	- None.
Changes for v3:
	- None.
Changes for v4:
	- Added Reviewed-by.
---
 drivers/mmc/mmc-uclass.c | 15 +++++++++++++++
 drivers/mmc/mmc.c        |  8 ++++++--
 include/mmc.h            | 10 ++++++++++
 3 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index 90690c8..b90e1ee 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -171,6 +171,21 @@ int mmc_deferred_probe(struct mmc *mmc)
 	return dm_mmc_deferred_probe(mmc->dev);
 }
 
+int dm_mmc_reinit(struct udevice *dev)
+{
+	struct dm_mmc_ops *ops = mmc_get_ops(dev);
+
+	if (ops->reinit)
+		return ops->reinit(dev);
+
+	return 0;
+}
+
+int mmc_reinit(struct mmc *mmc)
+{
+	return dm_mmc_reinit(mmc->dev);
+}
+
 int mmc_of_parse(struct udevice *dev, struct mmc_config *cfg)
 {
 	int val;
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index d79cdef..0727505 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -2816,13 +2816,17 @@ int mmc_get_op_cond(struct mmc *mmc)
 		return err;
 
 #if CONFIG_IS_ENABLED(DM_MMC)
-	/* The device has already been probed ready for use */
+	/*
+	 * Re-initialization is needed to clear old configuration for
+	 * mmc rescan.
+	 */
+	err = mmc_reinit(mmc);
 #else
 	/* made sure it's not NULL earlier */
 	err = mmc->cfg->ops->init(mmc);
+#endif
 	if (err)
 		return err;
-#endif
 	mmc->ddr_mode = 0;
 
 retry:
diff --git a/include/mmc.h b/include/mmc.h
index 8256219..161b8bc 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -422,6 +422,14 @@ struct dm_mmc_ops {
 	 */
 	int (*deferred_probe)(struct udevice *dev);
 	/**
+	 * reinit() - Re-initialization to clear old configuration for
+	 * mmc rescan.
+	 *
+	 * @dev:	Device to reinit
+	 * @return 0 if Ok, -ve if error
+	 */
+	int (*reinit)(struct udevice *dev);
+	/**
 	 * send_cmd() - Send a command to the MMC device
 	 *
 	 * @dev:	Device to receive the command
@@ -518,6 +526,7 @@ int dm_mmc_execute_tuning(struct udevice *dev, uint opcode);
 int dm_mmc_wait_dat0(struct udevice *dev, int state, int timeout_us);
 int dm_mmc_host_power_cycle(struct udevice *dev);
 int dm_mmc_deferred_probe(struct udevice *dev);
+int dm_mmc_reinit(struct udevice *dev);
 int dm_mmc_get_b_max(struct udevice *dev, void *dst, lbaint_t blkcnt);
 
 /* Transition functions for compatibility */
@@ -529,6 +538,7 @@ int mmc_wait_dat0(struct mmc *mmc, int state, int timeout_us);
 int mmc_set_enhanced_strobe(struct mmc *mmc);
 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);
 
 #else
-- 
2.7.4