mtd: nand: raw: denali: Wait for reset completion status
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.
Tested-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Radu Bacrau <radu.bacrau@intel.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/mtd/nand/raw/denali.c b/drivers/mtd/nand/raw/denali.c
index 15e9029..ab91db8 100644
--- a/drivers/mtd/nand/raw/denali.c
+++ b/drivers/mtd/nand/raw/denali.c
@@ -1220,6 +1220,17 @@
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 019deda..6cd02b2 100644
--- a/drivers/mtd/nand/raw/denali.h
+++ b/drivers/mtd/nand/raw/denali.h
@@ -321,6 +321,7 @@
#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 75ad15b..8318ff5 100644
--- a/drivers/mtd/nand/raw/denali_dt.c
+++ b/drivers/mtd/nand/raw/denali_dt.c
@@ -157,7 +157,11 @@
* kicked (bootstrap process). 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);