target/linux/bcm4908/patches-5.15/400-mtd-rawnand-brcmnand-disable-WP-on-BCM4908.patch

   1 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   2 Date: Thu, 21 Jan 2021 10:44:53 +0100
   3 Subject: [PATCH] mtd: rawnand: brcmnand: disable WP on BCM4908
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   7
   8 BCM4908 contains NAND controller version 0x0701 (v7.1). It means that
   9 NAND_WP should be available.
  10
  11 For some reason setting #WP on doesn't result in clearing NAND_STATUS_WP
  12 status bit:
  13 [    1.077857] bcm63138_nand ff801800.nand: timeout on status poll (expected c0000040 got c00000c0)
  14 [    1.086832] bcm63138_nand ff801800.nand: nand #WP expected on
  15
  16 For now try working without touching #WP.
  17
  18 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  19 ---
  20
  21 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
  22 +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
  23 @@ -38,7 +38,11 @@
  24   * 1: NAND_WP is set by default, cleared for erase/write operations
  25   * 2: NAND_WP is always cleared
  26   */
  27 +#if IS_ENABLED(CONFIG_ARCH_BCM4908)
  28 +static int wp_on = 0;
  29 +#else
  30  static int wp_on = 1;
  31 +#endif
  32  module_param(wp_on, int, 0444);
  33
  34  /***********************************************************************