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mediatek: add patch allowing 1-byte wide access to efuse

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Allow byte-wise access to mtk-efuse as some drivers require that.
Patch imported from mtk-openwrt-feeds (MTK SDK).

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2022-09-14 02:15:32 +01:00
parent c7c7905bce
commit 243a2184f2
1 changed files with 46 additions and 0 deletions
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46
target/linux/mediatek/patches-5.15/815-nvmem-mtk-efuse-support-minimum-one-byte-access-stri.patch Normal file
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@ -0,0 +1,46 @@
From 44ae4ed142265a6d50a9d3e6f4c395f97b6849ab Mon Sep 17 00:00:00 2001
From: Zhanyong Wang <zhanyong.wang@mediatek.com>
Date: Sat, 6 Nov 2021 20:06:30 +0800
Subject: [PATCH 2/5] nvmem: mtk-efuse: support minimum one byte access stride
and granularity
In order to support nvmem bits property, should support minimum 1 byte
read stride and minimum 1 byte read granularity at the same time.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Zhanyong Wang <zhanyong.wang@mediatek.com>
Change-Id: Iafe1ebf195d58a3e9e3518913f795d14a01dfd3b
---
drivers/nvmem/mtk-efuse.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
--- a/drivers/nvmem/mtk-efuse.c
+++ b/drivers/nvmem/mtk-efuse.c
@@ -19,11 +19,12 @@ static int mtk_reg_read(void *context,
unsigned int reg, void *_val, size_t bytes)
{
struct mtk_efuse_priv *priv = context;
- u32 *val = _val;
- int i = 0, words = bytes / 4;
+ void __iomem *addr = priv->base + reg;
+ u8 *val = _val;
+ int i;
- while (words--)
- *val++ = readl(priv->base + reg + (i++ * 4));
+ for (i = 0; i < bytes; i++, val++)
+ *val = readb(addr + i);
return 0;
}
@@ -45,8 +46,8 @@ static int mtk_efuse_probe(struct platfo
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
- econfig.stride = 4;
- econfig.word_size = 4;
+ econfig.stride = 1;
+ econfig.word_size = 1;
econfig.reg_read = mtk_reg_read;
econfig.size = resource_size(res);
econfig.priv = priv;