nvmem: imx: scu: correct the fuse word index

i.MX8 fuse word row index represented as one 4-bytes word.
Exp:
- MAC0 address layout in fuse:
offset 708: MAC[3] MAC[2] MAC[1] MAC[0]
offset 709: XX     xx     MAC[5] MAC[4]

The original code takes row index * 4 as the offset, this
not exactly match i.MX8 fuse map documentation.

So update code the reflect the truth.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200109104017.6249-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/nvmem/imx-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c
index 455675dd8efec86d260cfa812afa53cf5440466d..399e1eb8b4c18a8c30fc0c9e91e243707956472e 100644 (file)
--- a/drivers/nvmem/imx-ocotp-scu.c
+++ b/drivers/nvmem/imx-ocotp-scu.c
@@ -138,8 +138,8 @@ static int imx_scu_ocotp_read(void *context, unsigned int offset,
        void *p;
        int i, ret;
 
-       index = offset >> 2;
-       num_bytes = round_up((offset % 4) + bytes, 4);
+       index = offset;
+       num_bytes = round_up(bytes, 4);
        count = num_bytes >> 2;
 
        if (count > (priv->data->nregs - index))
@@ -168,7 +168,7 @@ static int imx_scu_ocotp_read(void *context, unsigned int offset,
                buf++;
        }
 
-       memcpy(val, (u8 *)p + offset % 4, bytes);
+       memcpy(val, (u8 *)p, bytes);
 
        mutex_unlock(&scu_ocotp_mutex);
 
@@ -188,10 +188,10 @@ static int imx_scu_ocotp_write(void *context, unsigned int offset,
        int ret;
 
        /* allow only writing one complete OTP word at a time */
-       if ((bytes != 4) || (offset % 4))
+       if (bytes != 4)
                return -EINVAL;
 
-       index = offset >> 2;
+       index = offset;
 
        if (in_hole(context, index))
                return -EINVAL;