From 8dfe69cdfc5c943f946faa873ff330b47125011d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Fri, 6 Jan 2023 19:37:37 +0100 Subject: kernel: update nvmem subsystem to the latest upstream MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Rafał Miłecki --- ...2-add-warning-when-upper-OTPs-are-updated.patch | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 target/linux/generic/backport-5.15/808-v6.2-0002-nvmem-stm32-add-warning-when-upper-OTPs-are-updated.patch (limited to 'target/linux/generic/backport-5.15/808-v6.2-0002-nvmem-stm32-add-warning-when-upper-OTPs-are-updated.patch') diff --git a/target/linux/generic/backport-5.15/808-v6.2-0002-nvmem-stm32-add-warning-when-upper-OTPs-are-updated.patch b/target/linux/generic/backport-5.15/808-v6.2-0002-nvmem-stm32-add-warning-when-upper-OTPs-are-updated.patch new file mode 100644 index 0000000000..5791df2606 --- /dev/null +++ b/target/linux/generic/backport-5.15/808-v6.2-0002-nvmem-stm32-add-warning-when-upper-OTPs-are-updated.patch @@ -0,0 +1,34 @@ +From d61784e6410f3df2028e6eb91b06ffed37a660e0 Mon Sep 17 00:00:00 2001 +From: Patrick Delaunay +Date: Fri, 18 Nov 2022 06:39:21 +0000 +Subject: [PATCH] nvmem: stm32: add warning when upper OTPs are updated + +As the upper OTPs are ECC protected, they support only one 32 bits word +programming. +For a second modification of this word, these ECC become invalid and +this OTP will be no more accessible, the shadowed value is invalid. + +This patch adds a warning to indicate an upper OTP update, because this +operation is dangerous as OTP is not locked by the driver after the first +update to avoid a second update. + +Signed-off-by: Patrick Delaunay +Signed-off-by: Srinivas Kandagatla +Link: https://lore.kernel.org/r/20221118063932.6418-3-srinivas.kandagatla@linaro.org +Signed-off-by: Greg Kroah-Hartman +--- + drivers/nvmem/stm32-romem.c | 3 +++ + 1 file changed, 3 insertions(+) + +--- a/drivers/nvmem/stm32-romem.c ++++ b/drivers/nvmem/stm32-romem.c +@@ -132,6 +132,9 @@ static int stm32_bsec_write(void *contex + } + } + ++ if (offset + bytes >= priv->lower * 4) ++ dev_warn(dev, "Update of upper OTPs with ECC protection (word programming, only once)\n"); ++ + return 0; + } + -- cgit v1.2.3