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| author | Steven A. Falco <sfalco@harris.com> | 2009-04-27 17:10:10 -0400 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-04-29 06:49:28 +0100 |
| commit | 3f33b0aaac4e208579fe5aa2964857d4e9ba10c5 (patch) | |
| tree | d63af4077e9f102a39c0f2d035f72dfa5fb7c1fc | |
| parent | e7693548950ea5801d5d8b00414aed37033cf972 (diff) | |
| download | op-kernel-dev-3f33b0aaac4e208579fe5aa2964857d4e9ba10c5.zip op-kernel-dev-3f33b0aaac4e208579fe5aa2964857d4e9ba10c5.tar.gz | |
mtd: Bug in m25p80.c during whole-chip erase
There is a logic error in "whole chip erase" for the m25p80 family. If
the whole device is successfully erased, erase_chip() will return 0, and
the code will fall through to the "else" clause, and do sector-by-sector
erase in addition to the whole-chip erase. This patch corrects that.
Also, the MAX_READY_WAIT_COUNT is insufficient for an m25p16 connected
to a 400 MHz powerpc. Increasing it allows me to successfully program
the device on my board.
Signed-off-by: Steven A. Falco <sfalco@harris.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| -rw-r--r-- | drivers/mtd/devices/m25p80.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index 8185b1f..dfadef8 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -54,7 +54,7 @@ #define SR_SRWD 0x80 /* SR write protect */ /* Define max times to check status register before we give up. */ -#define MAX_READY_WAIT_COUNT 100000 +#define MAX_READY_WAIT_COUNT 1000000 #define CMD_SIZE 4 #ifdef CONFIG_M25PXX_USE_FAST_READ @@ -246,10 +246,12 @@ static int m25p80_erase(struct mtd_info *mtd, struct erase_info *instr) mutex_lock(&flash->lock); /* whole-chip erase? */ - if (len == flash->mtd.size && erase_chip(flash)) { - instr->state = MTD_ERASE_FAILED; - mutex_unlock(&flash->lock); - return -EIO; + if (len == flash->mtd.size) { + if (erase_chip(flash)) { + instr->state = MTD_ERASE_FAILED; + mutex_unlock(&flash->lock); + return -EIO; + } /* REVISIT in some cases we could speed up erasing large regions * by using OPCODE_SE instead of OPCODE_BE_4K. We may have set up |
