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kernel: fix NVMEM looking for OTP NVMEM cells in wrong DT node 

It was breaking NAND controllers drivers.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2024-03-28 00:03:34 +01:00
parent 29515862ac
commit dd78a59cd7
1 changed files with 44 additions and 0 deletions
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44
target/linux/generic/pending-6.6/440-mtd-don-t-look-for-OTP-legacy-NVMEM-cells-if-proper-.patch Normal file
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@ -0,0 +1,44 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Wed, 27 Mar 2024 23:18:51 +0100
Subject: [PATCH] mtd: don't look for OTP legacy NVMEM cells if proper node
doesn't exist
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
If node with "user-otp" / "factory-otp" compatible doesn't exist it's
important to prevent NVMEM core from looking for legacy NVMEM cells.
Otherwise it would look for them in the device node.
This fixes treating NAND controller attached chips as NVMEM cell.
Problem example:
[ 0.410107] nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xdc
[ 0.416531] nand: Macronix MX30LF4G18AC
[ 0.420409] nand: 512 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
[ 0.428022] iproc_nand 18028000.nand-controller: detected 512MiB total, 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-8
[ 0.438991] Scanning device for bad blocks
(...)
[ 2.848418] nvmem user-otp1: nvmem: invalid reg on /nand-controller@18028000/nand@0
[ 2.856126] iproc_nand 18028000.nand-controller: error -EINVAL: Failed to register OTP NVMEM device
This long standing issue was exposed by the support for Macronix OTP.
Reported-by: Christian Marangi <ansuelsmth@gmail.com>
Fixes: 4b361cfa8624 ("mtd: core: add OTP nvmem provider support")
Fixes: e87161321a40 ("mtd: rawnand: macronix: OTP access for MX30LFxG18AC")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
drivers/mtd/mtdcore.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -931,7 +931,7 @@ 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 = !!np;
config.type = NVMEM_TYPE_OTP;
config.root_only = true;
config.ignore_wp = true;