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2010-06-22 Arnout Vandecappelle <arnout@mind.be>

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PR 1579/misc
	* libchip/i2c/spi-sd-card.c: Gradually increasing sleep times when
	waiting for write to finish.
This commit is contained in:
Sebastian Huber
2010-06-22 08:41:08 +00:00
parent 58eccd0b7c
commit 5e649e5186
2 changed files with 18 additions and 3 deletions
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c/src/ChangeLog
+6
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@@ -1,3 +1,9 @@
2010-06-22 Arnout Vandecappelle <arnout@mind.be>
PR 1579/misc
* libchip/i2c/spi-sd-card.c: Gradually increasing sleep times when
waiting for write to finish.
2010-06-22 Arnout Vandecappelle <arnout@mind.be>
PR 1567/misc
c/src/libchip/i2c/spi-sd-card.c
+12 -3
View File
@@ -373,6 +373,10 @@ static int sd_card_wait( sd_card_driver_entry *e)
don't know if it is a write or read, assume write.
FIXME should actually look at R2W_FACTOR for non-HC cards. */
int retries = e->n_ac_max * 25 / 10;
/* n_ac_max/100 is supposed to be the average waiting time. To
approximate this, we start with waiting n_ac_max/250 and
gradually increase the waiting time. */
int wait_time_bytes = (retries + 149) / 150;
while (e->busy) {
/* Query busy tokens */
rv = sd_card_query( e, e->response, n);
@@ -389,11 +393,16 @@ static int sd_card_wait( sd_card_driver_entry *e)
if (retries <= 0) {
return -RTEMS_TIMEOUT;
}
n = SD_CARD_COMMAND_SIZE;
if (e->schedule_if_busy) {
/* Invoke the scheduler */
rtems_task_wake_after( RTEMS_YIELD_PROCESSOR);
uint64_t wait_time_us = wait_time_bytes;
wait_time_us *= 8000000;
wait_time_us /= e->transfer_mode.baudrate;
rtems_task_wake_after( RTEMS_MICROSECONDS_TO_TICKS(wait_time_us));
retries -= wait_time_bytes;
wait_time_bytes = wait_time_bytes * 15 / 10;
} else {
n = SD_CARD_COMMAND_SIZE;
}
}
return 0;