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[MTD] make dataflash write-verify be optional 

This adds a WRITE_VERIFY Kconfig option to the DataFlash driver,
closely mirroring the similar NAND and ONENAND options, giving
an option to disable some code that's currently always enabled.

Removing this step probably saves a millisecond or so per page
when writing data, which will add up quickly since these pages
are small (the largest is 1 KiB).  It doesn't seem to add a
lot in terms of reliability, and wouldn't detect errors which
crop up when transferring data to the on-chip SRAM buffer.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Brownell 2008-08-06 21:55:14 -07:00 committed by David Woodhouse
parent cf93ae0260
commit 8c64038e4c
2 changed files with 13 additions and 5 deletions
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10
drivers/mtd/devices/Kconfig
View File

@ -59,6 +59,16 @@ config MTD_DATAFLASH
Sometimes DataFlash chips are packaged inside MMC-format
cards; at this writing, the MMC stack won't handle those.
config MTD_DATAFLASH_WRITE_VERIFY
bool "Verify DataFlash page writes"
depends on MTD_DATAFLASH
help
This adds an extra check when data is written to the flash.
It may help if you are verifying chip setup (timings etc) on
your board. There is a rare possibility that even though the
device thinks the write was successful, a bit could have been
flipped accidentally due to device wear or something else.
config MTD_DATAFLASH_OTP
bool "DataFlash OTP support (Security Register)"
depends on MTD_DATAFLASH

8
drivers/mtd/devices/mtd_dataflash.c
View File

@ -30,12 +30,10 @@
* doesn't (yet) use these for any kind of i/o overlap or prefetching.
*
* Sometimes DataFlash is packaged in MMC-format cards, although the
* MMC stack can't use SPI (yet), or distinguish between MMC and DataFlash
* MMC stack can't (yet?) distinguish between MMC and DataFlash
* protocols during enumeration.
*/
#define CONFIG_DATAFLASH_WRITE_VERIFY
/* reads can bypass the buffers */
#define OP_READ_CONTINUOUS 0xE8
#define OP_READ_PAGE 0xD2
@ -403,7 +401,7 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
(void) dataflash_waitready(priv->spi);
#ifdef CONFIG_DATAFLASH_WRITE_VERIFY
#ifdef CONFIG_MTD_DATAFLASH_VERIFY_WRITE
/* (3) Compare to Buffer1 */
addr = pageaddr << priv->page_offset;
@ -432,7 +430,7 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
} else
status = 0;
#endif /* CONFIG_DATAFLASH_WRITE_VERIFY */
#endif /* CONFIG_MTD_DATAFLASH_VERIFY_WRITE */
remaining = remaining - writelen;
pageaddr++;