On Fri, Jul 10, 2020 at 3:58 PM Ley Foon Tan ley.foon.tan@intel.com wrote:

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

---

v2:

• Added "Tested-by" in commit message.
• Restore "bootstrap process" in comment.

---

drivers/mtd/nand/raw/denali.c | 11 +++++++++++ drivers/mtd/nand/raw/denali.h | 1 + drivers/mtd/nand/raw/denali_dt.c | 11 ++++++++--- 3 files changed, 20 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..c22b05940df6 100644 --- a/drivers/mtd/nand/raw/denali_dt.c +++ b/drivers/mtd/nand/raw/denali_dt.c @@ -154,10 +154,15 @@ 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 (bootstrap proccess). The driver must wait until it
  

Again, you are touching this comment line with no good reason. "proccess" is a typo.

I fixed it up and applied. Thanks.

•            * 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