I ran into a problem where the reset was failing except when I enabled
debugging support. After talking with Garret Swalling at Spansion I
was told that the GL-N series of devices require a 500ns wait for the
reset to complete. The below patch adds a 1us delay after all reset
commands.
-Aaron Williams
Signed-off-by: Aaron Williams <aaron.willi...@caviumnetworks.com>
---
drivers/mtd/cfi_flash.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index 9ee639e..4bc01f7 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -586,6 +586,7 @@ static int flash_status_check (flash_info_t * info,
flash_sect_t sector,
prompt, info->start[sector],
flash_read_long (info, sector, 0));
flash_write_cmd (info, sector, 0, info->cmd_reset);
+ udelay(1);
return ERR_TIMOUT;
}
udelay (1); /* also triggers watchdog */
@@ -633,6 +634,7 @@ static int flash_full_status_check (flash_info_t * info,
flash_sect_t sector,
puts ("Vpp Low Error.\n");
}
flash_write_cmd (info, sector, 0, info->cmd_reset);
+ udelay(1);
break;
default:
break;
@@ -1496,6 +1498,7 @@ void flash_read_user_serial (flash_info_t * info, void
*buffer, int offset,
flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID);
memcpy (dst, src + offset, len);
flash_write_cmd (info, 0, 0, info->cmd_reset);
+ udelay(1);
flash_unmap(info, 0, FLASH_OFFSET_USER_PROTECTION, src);
}
@@ -1511,6 +1514,7 @@ void flash_read_factory_serial (flash_info_t * info, void
*buffer, int offset,
flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID);
memcpy (buffer, src + offset, len);
flash_write_cmd (info, 0, 0, info->cmd_reset);
+ udelay(1);
flash_unmap(info, 0, FLASH_OFFSET_INTEL_PROTECTION, src);
}
@@ -1542,6 +1546,7 @@ static void cfi_reverse_geometry(struct cfi_qry *qry)
static void cmdset_intel_read_jedec_ids(flash_info_t *info)
{
flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
+ udelay(1);
flash_write_cmd(info, 0, 0, FLASH_CMD_READ_ID);
udelay(1000); /* some flash are slow to respond */
info->manufacturer_id = flash_read_uchar (info,
@@ -1610,6 +1615,7 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info)
break;
}
flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
+ udelay(1);
}
static int cmdset_amd_init(flash_info_t *info, struct cfi_qry *qry)
@@ -1736,6 +1742,7 @@ void __flash_cmd_reset(flash_info_t *info)
* that AMD flash roms ignore the Intel command.
*/
flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
+ udelay(1);
flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
}
void flash_cmd_reset(flash_info_t *info)
--
1.7.3.4
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