target/linux/layerscape/patches-4.4/1113-mtd-spi-nor-fsl-quad-move-mtd_device_register-to-the.patch

   1 From 6f1195d231ab576809fe2f4cff44a6e48cff2457 Mon Sep 17 00:00:00 2001
   2 From: Yutang Jiang <yutang.jiang@nxp.com>
   3 Date: Fri, 2 Sep 2016 22:00:16 +0800
   4 Subject: [PATCH 113/113] mtd: spi-nor: fsl-quad: move mtd_device_register to
   5  the last of probe
   6
   7 After call mtd_device_register, the mtd devices should be workable immediately.
   8 If before finish all of init work call the mtd_device_register, it will not
   9 respond work request timely.
  10
  11 For example, openwrt/lede have a AUTO split special flash partitions mechanism
  12 while mtd driver register. So, before call mtd_device_register, must let all of
  13 init work ready.
  14
  15 Signed-off-by: Yutang Jiang <yutang.jiang@nxp.com>
  16 ---
  17  drivers/mtd/spi-nor/fsl-quadspi.c |   14 ++++++++++----
  18  1 file changed, 10 insertions(+), 4 deletions(-)
  19
  20 --- a/drivers/mtd/spi-nor/fsl-quadspi.c
  21 +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
  22 @@ -1280,10 +1280,6 @@ static int fsl_qspi_probe(struct platfor
  23                 if (ret)
  24                         goto mutex_failed;
  25
  26 -               ret = mtd_device_register(mtd, NULL, 0);
  27 -               if (ret)
  28 -                       goto mutex_failed;
  29 -
  30                 /* Set the correct NOR size now. */
  31                 if (q->nor_size == 0) {
  32                         q->nor_size = mtd->size;
  33 @@ -1313,6 +1309,16 @@ static int fsl_qspi_probe(struct platfor
  34                 goto last_init_failed;
  35
  36         fsl_qspi_clk_disable_unprep(q);
  37 +
  38 +       for (i = 0; i < q->nor_num; i++) {
  39 +               /* skip the holes */
  40 +               if (!q->has_second_chip)
  41 +                       i *= 2;
  42 +
  43 +               ret = mtd_device_register(&q->nor[i].mtd, NULL, 0);
  44 +               if (ret)
  45 +                       goto last_init_failed;
  46 +       }
  47         return 0;
  48
  49  last_init_failed: