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-rw-r--r--target/linux/generic/backport-5.15/803-v5.17-0002-nvmem-mtk-efuse-support-minimum-one-byte-access-stri.patch47
1 files changed, 47 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.15/803-v5.17-0002-nvmem-mtk-efuse-support-minimum-one-byte-access-stri.patch b/target/linux/generic/backport-5.15/803-v5.17-0002-nvmem-mtk-efuse-support-minimum-one-byte-access-stri.patch
new file mode 100644
index 0000000000..785bfe53f5
--- /dev/null
+++ b/target/linux/generic/backport-5.15/803-v5.17-0002-nvmem-mtk-efuse-support-minimum-one-byte-access-stri.patch
@@ -0,0 +1,47 @@
+From 98e2c4efae214fb7086cac9117616eb6ea11475d Mon Sep 17 00:00:00 2001
+From: Chunfeng Yun <chunfeng.yun@mediatek.com>
+Date: Thu, 9 Dec 2021 17:42:34 +0000
+Subject: [PATCH] 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: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+Link: https://lore.kernel.org/r/20211209174235.14049-4-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ 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;