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mtd: fix timeout in M25P80 driver

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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>
This commit is contained in:
Peter Horton 2009-05-08 13:51:53 +01:00 committed by David Woodhouse
parent 3f33b0aaac
commit cd1a6de7d4
1 changed files with 8 additions and 8 deletions
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16
drivers/mtd/devices/m25p80.c
View file

@ -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;
}