diff --git a/target/linux/ipq40xx/patches-6.6/110-mtd-limit-OTP-nvmem-to-non-nand-devices.patch b/target/linux/ipq40xx/patches-6.6/110-mtd-limit-OTP-nvmem-to-non-nand-devices.patch deleted file mode 100644 index 03f45d7a9a..0000000000 --- a/target/linux/ipq40xx/patches-6.6/110-mtd-limit-OTP-nvmem-to-non-nand-devices.patch +++ /dev/null @@ -1,58 +0,0 @@ -From 540dcef6f39d6356d2a65230a8d4e9738ee2d25b Mon Sep 17 00:00:00 2001 -From: Christian Marangi -Date: Wed, 20 Mar 2024 16:43:01 +0100 -Subject: [PATCH] mtd: limit OTP nvmem to non nand devices - -MTD OTP logic is very fragile and can be problematic with some specific -kind of devices. - -NVMEM across the years had various iteration on how Cells could be -declared in DT and MTD OTP probably was left behind and -add_legacy_fixed_of_cells was enabled without thinking of the consequences. - -That option enables NVMEM to scan the provided of_node and treat each -child as a NVMEM Cell, this was to support legacy NVMEM implementation -and don't cause regression. - -This is problematic if we have devices like Nand where the OTP is -triggered by setting a special mode in the flash. In this context real -partitions declared in the Nand node are registered as OTP Cells and -this cause probe fail with -EINVAL error. - -This was never notice due to the fact that till now, no Nand supported -the OTP feature. With commit e87161321a40 ("mtd: rawnand: macronix: OTP -access for MX30LFxG18AC") this changed and coincidentally this Nand is -used on an FritzBox 7530 supported on OpenWrt. - -Alternative and more robust way to declare OTP Cells are already -prossible by using the fixed-layout node or by declaring a child node -with the compatible set to "otp-user" or "otp-factory". - -To fix this and limit any regression with other MTD that makes use of -declaring OTP as direct child of the dev node, disable -add_legacy_fixed_of_cells if we have a node called nand since it's the -standard property name to identify Nand devices attached to a Nand -Controller. - -With the following logic, the OTP NVMEM entry is correctly created with -no Cells and the MTD Nand is correctly probed and partitions are -correctly exposed. - -Fixes: 2cc3b37f5b6d ("nvmem: add explicit config option to read old syntax fixed OF cells") -Cc: -Signed-off-by: Christian Marangi ---- - drivers/mtd/mtdcore.c | 2 +- - 1 file changed, 1 insertion(+), 1 deletion(-) - ---- a/drivers/mtd/mtdcore.c -+++ b/drivers/mtd/mtdcore.c -@@ -933,7 +933,7 @@ static struct nvmem_device *mtd_otp_nvme - config.name = compatible; - config.id = NVMEM_DEVID_AUTO; - config.owner = THIS_MODULE; -- config.add_legacy_fixed_of_cells = true; -+ config.add_legacy_fixed_of_cells = !of_node_name_eq(mtd->dev.of_node, "nand"); - config.type = NVMEM_TYPE_OTP; - config.root_only = true; - config.ignore_wp = true;