target/linux/mediatek/patches-5.15/800-v5.17-nvmem-mtk-efuse-support-minimum-one-byte-access-stri.patch

   1 From 98e2c4efae214fb7086cac9117616eb6ea11475d Mon Sep 17 00:00:00 2001
   2 From: Chunfeng Yun <chunfeng.yun@mediatek.com>
   3 Date: Thu, 9 Dec 2021 17:42:34 +0000
   4 Subject: [PATCH] nvmem: mtk-efuse: support minimum one byte access stride and
   5  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: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
  12 Link: https://lore.kernel.org/r/20211209174235.14049-4-srinivas.kandagatla@linaro.org
  13 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  14 ---
  15  drivers/nvmem/mtk-efuse.c | 13 +++++++------
  16  1 file changed, 7 insertions(+), 6 deletions(-)
  17
  18 --- a/drivers/nvmem/mtk-efuse.c
  19 +++ b/drivers/nvmem/mtk-efuse.c
  20 @@ -19,11 +19,12 @@ static int mtk_reg_read(void *context,
  21                         unsigned int reg, void *_val, size_t bytes)
  22  {
  23         struct mtk_efuse_priv *priv = context;
  24 -       u32 *val = _val;
  25 -       int i = 0, words = bytes / 4;
  26 +       void __iomem *addr = priv->base + reg;
  27 +       u8 *val = _val;
  28 +       int i;
  29
  30 -       while (words--)
  31 -               *val++ = readl(priv->base + reg + (i++ * 4));
  32 +       for (i = 0; i < bytes; i++, val++)
  33 +               *val = readb(addr + i);
  34
  35         return 0;
  36  }
  37 @@ -45,8 +46,8 @@ static int mtk_efuse_probe(struct platfo
  38         if (IS_ERR(priv->base))
  39                 return PTR_ERR(priv->base);
  40
  41 -       econfig.stride = 4;
  42 -       econfig.word_size = 4;
  43 +       econfig.stride = 1;
  44 +       econfig.word_size = 1;
  45         econfig.reg_read = mtk_reg_read;
  46         econfig.size = resource_size(res);
  47         econfig.priv = priv;