target/linux/mediatek/patches-4.14/0162-mtd-nand-mtk-use-nand_reset-to-reset-NAND-devices-in.patch

   1 From fb607c7c1eaeb47ec2ffed99cab571892cb6af7d Mon Sep 17 00:00:00 2001
   2 From: Xiaolei Li <xiaolei.li@mediatek.com>
   3 Date: Thu, 2 Nov 2017 10:05:07 +0800
   4 Subject: [PATCH 162/224] mtd: nand: mtk: use nand_reset() to reset NAND
   5  devices in resume function
   6
   7 Previously, we only select chips and then send reset command to a NAND
   8 device during resuming nand driver. There is a lack of deselecting chips.
   9 It is advised to reset and initialize a NAND device using nand_reset().
  10
  11 Signed-off-by: Xiaolei Li <xiaolei.li@mediatek.com>
  12 Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
  13 Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
  14 ---
  15  drivers/mtd/nand/mtk_nand.c | 8 ++------
  16  1 file changed, 2 insertions(+), 6 deletions(-)
  17
  18 --- a/drivers/mtd/nand/mtk_nand.c
  19 +++ b/drivers/mtd/nand/mtk_nand.c
  20 @@ -1540,7 +1540,6 @@ static int mtk_nfc_resume(struct device
  21         struct mtk_nfc *nfc = dev_get_drvdata(dev);
  22         struct mtk_nfc_nand_chip *chip;
  23         struct nand_chip *nand;
  24 -       struct mtd_info *mtd;
  25         int ret;
  26         u32 i;
  27
  28 @@ -1553,11 +1552,8 @@ static int mtk_nfc_resume(struct device
  29         /* reset NAND chip if VCC was powered off */
  30         list_for_each_entry(chip, &nfc->chips, node) {
  31                 nand = &chip->nand;
  32 -               mtd = nand_to_mtd(nand);
  33 -               for (i = 0; i < chip->nsels; i++) {
  34 -                       nand->select_chip(mtd, i);
  35 -                       nand->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
  36 -               }
  37 +               for (i = 0; i < chip->nsels; i++)
  38 +                       nand_reset(nand, i);
  39         }
  40
  41         return 0;