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| author | Peter Horton <zero@colonel-panic.org> | 2009-05-08 13:51:53 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-05-08 13:51:53 +0100 |
| commit | cd1a6de7d4a492bf3405a6c070075a4cb8c90262 (patch) | |
| tree | d505355d42b3af8b93b6fd191e23a88c8e892d93 | |
| parent | 3f33b0aaac4e208579fe5aa2964857d4e9ba10c5 (diff) | |
| download | op-kernel-dev-cd1a6de7d4a492bf3405a6c070075a4cb8c90262.zip op-kernel-dev-cd1a6de7d4a492bf3405a6c070075a4cb8c90262.tar.gz | |
mtd: fix timeout in M25P80 driver
Extend erase timeout in M25P80 SPI Flash driver.
The M25P80 drivers fails erasing sectors on a M25P128 because the ready
wait timeout is too short. Change the timeout from a simple loop count to a
suitable number of seconds.
Signed-off-by: Peter Horton <zero@colonel-panic.org>
Tested-by: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| -rw-r--r-- | drivers/mtd/devices/m25p80.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index dfadef8..cc6369e 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 1000000 +#define MAX_READY_WAIT_JIFFIES (10 * HZ) /* eg. M25P128 specs 6s max sector erase */ #define CMD_SIZE 4 #ifdef CONFIG_M25PXX_USE_FAST_READ @@ -139,20 +139,20 @@ static inline int write_enable(struct m25p *flash) */ static int wait_till_ready(struct m25p *flash) { - int count; + unsigned long deadline; int sr; - /* one chip guarantees max 5 msec wait here after page writes, - * but potentially three seconds (!) after page erase. - */ - for (count = 0; count < MAX_READY_WAIT_COUNT; count++) { + deadline = jiffies + MAX_READY_WAIT_JIFFIES; + + do { if ((sr = read_sr(flash)) < 0) break; else if (!(sr & SR_WIP)) return 0; - /* REVISIT sometimes sleeping would be best */ - } + cond_resched(); + + } while (!time_after_eq(jiffies, deadline)); return 1; } |
