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mtd: nand: raw: denali: Wait for reset completion status

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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>
This commit is contained in:
Ley Foon Tan 2020-07-10 14:58:15 +08:00 • committed by Masahiro Yamada
parent 3e57f879ee
commit 94e8b328a7
3 changed files with 17 additions and 1 deletions
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11
drivers/mtd/nand/raw/denali.c
View file

@ -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;

1
drivers/mtd/nand/raw/denali.h
View file

@ -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__ */

6
drivers/mtd/nand/raw/denali_dt.c
View file

@ -157,7 +157,11 @@ static int denali_dt_probe(struct udevice *dev)
* 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);