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mtd: cfi: Fix checking status register feature

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Commit 72443c7f7d ("mtd: cfi: Add support for status register
polling") added a feature check to determine if status register
is available for certain flash chips. The "lower software bits"
register used to determine this feature is not backward compati-
ble. Older flash chips without this feature has reserved value
0xff. Instead of checking "lower software bits" register, use
CFI primary vendor-specific extended query. Since CFI version
1.4, software features can be read from offset 0x53 according to
document AN201168 from Cypress.

Signed-off-by: York Sun <york.sun@nxp.com>
CC: Marek Vasut <marek.vasut@gmail.com>
Tested-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
York Sun 2017-11-18 11:09:08 -08:00 • committed by Stefan Roese
parent b06c46de63
commit 2544f47078
1 changed files with 9 additions and 3 deletions
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12
drivers/mtd/cfi_flash.c
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@ -1694,7 +1694,7 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info)
{
ushort bankId = 0;
uchar manuId;
uchar lsbits;
uchar feature;
flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
flash_unlock_seq(info, 0);
@ -1710,8 +1710,14 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info)
}
info->manufacturer_id = manuId;
lsbits = flash_read_uchar(info, FLASH_OFFSET_LOWER_SW_BITS);
info->sr_supported = lsbits & BIT(0);
debug("info->ext_addr = 0x%x, cfi_version = 0x%x\n",
info->ext_addr, info->cfi_version);
if (info->ext_addr && info->cfi_version >= 0x3134) {
/* read software feature (at 0x53) */
feature = flash_read_uchar(info, info->ext_addr + 0x13);
debug("feature = 0x%x\n", feature);
info->sr_supported = feature & 0x1;
}
switch (info->chipwidth){
case FLASH_CFI_8BIT: