target/linux/brcm63xx/patches-4.4/000-4.8-05-mtd-nxp-spifi-return-amount-of-data-transferred-or-e.patch

   1 From bc418cd2652f47a327e27f978caa3d85f9558b09 Mon Sep 17 00:00:00 2001
   2 From: Brian Norris <computersforpeace@gmail.com>
   3 Date: Thu, 5 May 2016 17:31:51 -0700
   4 Subject: [PATCH 05/10] mtd: nxp-spifi: return amount of data transferred or
   5  error in read/write
   6
   7 Add checking of SPI transfer errors and return them from read/write
   8 functions. Also return the amount of data transferred.
   9
  10 Signed-off-by: Brian Norris <computersforpeace@gmail.com>
  11 ---
  12  drivers/mtd/spi-nor/nxp-spifi.c | 13 +++++++++----
  13  1 file changed, 9 insertions(+), 4 deletions(-)
  14
  15 --- a/drivers/mtd/spi-nor/nxp-spifi.c
  16 +++ b/drivers/mtd/spi-nor/nxp-spifi.c
  17 @@ -185,7 +185,7 @@ static ssize_t nxp_spifi_read(struct spi
  18         memcpy_fromio(buf, spifi->flash_base + from, len);
  19         *retlen += len;
  20
  21 -       return 0;
  22 +       return len;
  23  }
  24
  25  static ssize_t nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len,
  26 @@ -194,6 +194,7 @@ static ssize_t nxp_spifi_write(struct sp
  27         struct nxp_spifi *spifi = nor->priv;
  28         u32 cmd;
  29         int ret;
  30 +       size_t i;
  31
  32         ret = nxp_spifi_set_memory_mode_off(spifi);
  33         if (ret)
  34 @@ -209,10 +210,14 @@ static ssize_t nxp_spifi_write(struct sp
  35               SPIFI_CMD_FRAMEFORM(spifi->nor.addr_width + 1);
  36         writel(cmd, spifi->io_base + SPIFI_CMD);
  37
  38 -       while (len--)
  39 -               writeb(*buf++, spifi->io_base + SPIFI_DATA);
  40 +       for (i = 0; i < len; i++)
  41 +               writeb(buf[i], spifi->io_base + SPIFI_DATA);
  42
  43 -       return nxp_spifi_wait_for_cmd(spifi);
  44 +       ret = nxp_spifi_wait_for_cmd(spifi);
  45 +       if (ret)
  46 +               return ret;
  47 +
  48 +       return len;
  49  }
  50
  51  static int nxp_spifi_erase(struct spi_nor *nor, loff_t offs)