For the word write it is checked if the chip has the correct value. But it is not checked for the write buffer as only checked if ready. To make sure for the write buffer change to check the value.

It is enough as this patch is only checking the last written word. Since it is described by data sheets to check the operation status.

Signed-off-by: Tokunori Ikegami ikegami@allied-telesis.co.jp Reviewed-by: Joakim Tjernlund Joakim.Tjernlund@infinera.com Cc: Chris Packham chris.packham@alliedtelesis.co.nz Cc: Brian Norris computersforpeace@gmail.com Cc: David Woodhouse dwmw2@infradead.org Cc: Boris Brezillon boris.brezillon@free-electrons.com Cc: Marek Vasut marek.vasut@gmail.com Cc: Richard Weinberger richard@nod.at Cc: Cyrille Pitchen cyrille.pitchen@wedev4u.fr Cc: linux-mtd@lists.infradead.org Cc: stable@vger.kernel.org --- Changes since v7: - None.

Changes since v6: - Change Cc: Joakim Tjernlund tag as Reviewed-by: tag. - Add Cc: stable tag.

Changes since v5: - None since the v4 change is just combined as same series by v6.

Changes since v3: - Removed to check if chip ready.

Changes since v2: - Just updated the patch to add v3 version into subject and desribe a changelog.

Changes since v1: - Just changed to add Brian as Cc and the patch is sent to Boris-san as To

Changes since v0: - Changed Split the part to change write buffer from the v1 patch

drivers/mtd/chips/cfi_cmdset_0002.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c index e397b80e40cc..1d6be8c63d39 100644 --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -1879,7 +1879,7 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip, if (time_after(jiffies, timeo) && !chip_ready(map, adr)) break;

- if (chip_ready(map, adr)) { + if (chip_good(map, adr, datum)) { xip_enable(map, chip, adr); goto op_done; }

For the word write functions it is retried for error. But it is not implemented to retry for the erase functions. To make sure for the erase functions change to retry as same.

This is needed to prevent the flash erase error caused only once. It was caused by the error case of chip_good() in the do_erase_oneblock(). Also it was confirmed on the MACRONIX flash device MX29GL512FHT2I-11G. But the error issue behavior is not able to reproduce at this moment. The flash controller is parallel Flash interface integrated on BCM53003.

Signed-off-by: Tokunori Ikegami ikegami@allied-telesis.co.jp Reviewed-by: Joakim Tjernlund Joakim.Tjernlund@infinera.com Cc: Chris Packham chris.packham@alliedtelesis.co.nz Cc: Brian Norris computersforpeace@gmail.com Cc: David Woodhouse dwmw2@infradead.org Cc: Boris Brezillon boris.brezillon@free-electrons.com Cc: Marek Vasut marek.vasut@gmail.com Cc: Richard Weinberger richard@nod.at Cc: Cyrille Pitchen cyrille.pitchen@wedev4u.fr Cc: linux-mtd@lists.infradead.org Cc: stable@vger.kernel.org --- Changes since v7: - None.

Changes since v6: - Change Cc: Joakim Tjernlund tag as Reviewed-by: tag. - Add Cc: stable tag.

Changes since v5: - No change for this patch.

Changes since v4: - Just fixed the commit message.

Changes since v3: - The patch series are just rebased since the coding style fix has been applied.

Changes since v2: - Just fix the commit message of patch to retry the chip erase error.

Changes since v1: - Just split the change from the v1 patch.

drivers/mtd/chips/cfi_cmdset_0002.c | 10 ++++++++++ 1 file changed, 10 insertions(+)

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c index 0b67f90415fd..e703900975d4 100644 --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -2240,6 +2240,7 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip) unsigned long int adr; DECLARE_WAITQUEUE(wait, current); int ret = 0; + int retry_cnt = 0;

adr = cfi->addr_unlock1;

@@ -2257,6 +2258,7 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip) ENABLE_VPP(map); xip_disable(map, chip, adr);

+ retry: cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); @@ -2310,6 +2312,9 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip) map_write(map, CMD(0xF0), chip->start); /* FIXME - should have reset delay before continuing */

+ if (++retry_cnt <= MAX_RETRIES) + goto retry; + ret = -EIO; }

@@ -2329,6 +2334,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip, unsigned long timeo = jiffies + HZ; DECLARE_WAITQUEUE(wait, current); int ret = 0; + int retry_cnt = 0;

adr += chip->start;

@@ -2346,6 +2352,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip, ENABLE_VPP(map); xip_disable(map, chip, adr);

+ retry: cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); @@ -2402,6 +2409,9 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip, map_write(map, CMD(0xF0), chip->start); /* FIXME - should have reset delay before continuing */

+ if (++retry_cnt <= MAX_RETRIES) + goto retry; + ret = -EIO; }