target/linux/generic/backport-5.15/422-v5.19-mtd-spi-nor-support-eon-en25qh256a.patch

   1 From 6abef37d16d0c570ef5a149e63762fba2a30804b Mon Sep 17 00:00:00 2001
   2 From: "Leon M. George" <leon@georgemail.eu>
   3 Date: Wed, 30 Mar 2022 16:16:56 +0200
   4 Subject: [PATCH] mtd: spi-nor: support eon en25qh256a variant
   5
   6 The EN25QH256A variant of the EN25QH256 doesn't initialize correctly from SFDP
   7 alone and only accesses memory below 8m (addr_width is 4 but read_opcode takes
   8 only 3 bytes).
   9
  10 Set SNOR_F_4B_OPCODES if the flash chip variant was detected using hwcaps.
  11
  12 The fix submitted upstream uses the PARSE_SFDP initializer that is not
  13 available in the kernel used with Openwrt.
  14
  15 Signed-off-by: Leon M. George <leon@georgemail.eu>
  16 ---
  17  drivers/mtd/spi-nor/eon.c | 11 +++++++++++
  18  1 file changed, 11 insertions(+)
  19
  20 --- a/drivers/mtd/spi-nor/eon.c
  21 +++ b/drivers/mtd/spi-nor/eon.c
  22 @@ -8,6 +8,16 @@
  23
  24  #include "core.h"
  25
  26 +static void en25qh256_post_sfdp_fixups(struct spi_nor *nor)
  27 +{
  28 +       if (nor->params->hwcaps.mask & SNOR_HWCAPS_READ_1_1_4)
  29 +               nor->flags |= SNOR_F_4B_OPCODES;
  30 +}
  31 +
  32 +static const struct spi_nor_fixups en25qh256_fixups = {
  33 +       .post_sfdp = en25qh256_post_sfdp_fixups,
  34 +};
  35 +
  36  static const struct flash_info eon_parts[] = {
  37         /* EON -- en25xxx */
  38         { "en25f32",    INFO(0x1c3116, 0, 64 * 1024,   64, SECT_4K) },
  39 @@ -23,7 +33,9 @@ static const struct flash_info eon_parts
  40         { "en25qh64",   INFO(0x1c7017, 0, 64 * 1024,  128,
  41                              SECT_4K | SPI_NOR_DUAL_READ) },
  42         { "en25qh128",  INFO(0x1c7018, 0, 64 * 1024,  256, 0) },
  43 -       { "en25qh256",  INFO(0x1c7019, 0, 64 * 1024,  512, 0) },
  44 +       { "en25qh256",  INFO(0x1c7019, 0, 64 * 1024,  512,
  45 +               SPI_NOR_DUAL_READ)
  46 +               .fixups = &en25qh256_fixups },
  47         { "en25s64",    INFO(0x1c3817, 0, 64 * 1024,  128, SECT_4K) },
  48  };
  49