Fixed delay 200us is not working in certain platforms. Change to
poll for reset completion status to have more reliable reset process.
Controller will set the rst_comp bit in intr_status register after
controller has completed its reset and initialization process.
Signed-off-by: Radu Bacrau <radu.bac...@intel.com>
Signed-off-by: Ley Foon Tan <ley.foon....@intel.com>
---
drivers/mtd/nand/raw/denali.c | 11 +++++++++++
drivers/mtd/nand/raw/denali.h | 1 +
drivers/mtd/nand/raw/denali_dt.c | 10 +++++++---
3 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/nand/raw/denali.c b/drivers/mtd/nand/raw/denali.c
index 15e90291de09..ab91db85467d 100644
--- a/drivers/mtd/nand/raw/denali.c
+++ b/drivers/mtd/nand/raw/denali.c
@@ -1220,6 +1220,17 @@ static int denali_multidev_fixup(struct denali_nand_info
*denali)
return 0;
}
+int denali_wait_reset_complete(struct denali_nand_info *denali)
+{
+ u32 irq_status;
+
+ irq_status = denali_wait_for_irq(denali, INTR__RST_COMP);
+ if (!(irq_status & INTR__RST_COMP))
+ return -EIO;
+
+ return 0;
+}
+
int denali_init(struct denali_nand_info *denali)
{
struct nand_chip *chip = &denali->nand;
diff --git a/drivers/mtd/nand/raw/denali.h b/drivers/mtd/nand/raw/denali.h
index 019deda094e5..6cd02b2e26ee 100644
--- a/drivers/mtd/nand/raw/denali.h
+++ b/drivers/mtd/nand/raw/denali.h
@@ -321,6 +321,7 @@ struct denali_nand_info {
#define DENALI_CAP_DMA_64BIT BIT(1)
int denali_calc_ecc_bytes(int step_size, int strength);
+int denali_wait_reset_complete(struct denali_nand_info *denali);
int denali_init(struct denali_nand_info *denali);
#endif /* __DENALI_H__ */
diff --git a/drivers/mtd/nand/raw/denali_dt.c b/drivers/mtd/nand/raw/denali_dt.c
index 75ad15b0758c..8a6950f8a39f 100644
--- a/drivers/mtd/nand/raw/denali_dt.c
+++ b/drivers/mtd/nand/raw/denali_dt.c
@@ -154,10 +154,14 @@ static int denali_dt_probe(struct udevice *dev)
/*
* When the reset is deasserted, the initialization sequence is
- * kicked (bootstrap process). The driver must wait until it is
- * finished. Otherwise, it will result in unpredictable
behavior.
+ * kicked. The driver must wait until it is finished. Otherwise,
+ * it will result in unpredictable behavior.
*/
- udelay(200);
+ ret = denali_wait_reset_complete(denali);
+ if (ret) {
+ dev_err(denali->dev, "reset not completed.\n");
+ return ret;
+ }
}
return denali_init(denali);
--
2.19.0
