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bcm4908: workaround NAND controller #WP issue

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There seems to be a problem with setting #WP. On the other hand ignoring
the #WP seems to work. rootfs_data UBI volume seems to persist changes.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2021-01-21 13:26:17 +01:00
parent e78d3e44dd
commit 3bd8f660a4
1 changed files with 34 additions and 0 deletions
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target/linux/bcm4908/patches-5.4/400-mtd-rawnand-brcmnand-disable-WP-on-BCM4908.patch Normal file
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Thu, 21 Jan 2021 10:44:53 +0100
Subject: [PATCH] mtd: rawnand: brcmnand: disable WP on BCM4908
MIME-Version: 1.0
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BCM4908 contains NAND controller version 0x0701 (v7.1). It means that
NAND_WP should be available.
For some reason setting #WP on doesn't result in clearing NAND_STATUS_WP
status bit:
[ 1.077857] bcm63138_nand ff801800.nand: timeout on status poll (expected c0000040 got c00000c0)
[ 1.086832] bcm63138_nand ff801800.nand: nand #WP expected on
For now try working without touching #WP.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -38,7 +38,11 @@
* 1: NAND_WP is set by default, cleared for erase/write operations
* 2: NAND_WP is always cleared
*/
+#if IS_ENABLED(CONFIG_ARCH_BCM4908)
+static int wp_on = 0;
+#else
static int wp_on = 1;
+#endif
module_param(wp_on, int, 0444);
/***********************************************************************