target/linux/mediatek/patches-5.15/815-nvmem-mtk-efuse-support-minimum-one-byte-access-stri.patch

   1 From 44ae4ed142265a6d50a9d3e6f4c395f97b6849ab Mon Sep 17 00:00:00 2001
   2 From: Zhanyong Wang <zhanyong.wang@mediatek.com>
   3 Date: Sat, 6 Nov 2021 20:06:30 +0800
   4 Subject: [PATCH 2/5] nvmem: mtk-efuse: support minimum one byte access stride
   5  and granularity
   6
   7 In order to support nvmem bits property, should support minimum 1 byte
   8 read stride and minimum 1 byte read granularity at the same time.
   9
  10 Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
  11 Signed-off-by: Zhanyong Wang <zhanyong.wang@mediatek.com>
  12 Change-Id: Iafe1ebf195d58a3e9e3518913f795d14a01dfd3b
  13 ---
  14  drivers/nvmem/mtk-efuse.c | 13 +++++++------
  15  1 file changed, 7 insertions(+), 6 deletions(-)
  16
  17 --- a/drivers/nvmem/mtk-efuse.c
  18 +++ b/drivers/nvmem/mtk-efuse.c
  19 @@ -19,11 +19,12 @@ static int mtk_reg_read(void *context,
  20                         unsigned int reg, void *_val, size_t bytes)
  21  {
  22         struct mtk_efuse_priv *priv = context;
  23 -       u32 *val = _val;
  24 -       int i = 0, words = bytes / 4;
  25 +       void __iomem *addr = priv->base + reg;
  26 +       u8 *val = _val;
  27 +       int i;
  28
  29 -       while (words--)
  30 -               *val++ = readl(priv->base + reg + (i++ * 4));
  31 +       for (i = 0; i < bytes; i++, val++)
  32 +               *val = readb(addr + i);
  33
  34         return 0;
  35  }
  36 @@ -45,8 +46,8 @@ static int mtk_efuse_probe(struct platfo
  37         if (IS_ERR(priv->base))
  38                 return PTR_ERR(priv->base);
  39
  40 -       econfig.stride = 4;
  41 -       econfig.word_size = 4;
  42 +       econfig.stride = 1;
  43 +       econfig.word_size = 1;
  44         econfig.reg_read = mtk_reg_read;
  45         econfig.size = resource_size(res);
  46         econfig.priv = priv;