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mmc: core: add a short delay in mmc_power_off 

Stress-testing the runtime power management of libertas_sdio
through a rmmod/insmod loop revealed that it is quite easy to
cause an ETIMEDOUT failure in mmc_sdio_power_restore() leading to:
   libertas_sdio: probe of mmc1:0001:1 failed with error -16

Experimentation shows that a very short delay (100us) is needed in
the power down path before the card can be successfully booted again.
We know that this setup is lacking poweroff clamps on the card's power
lines, but as only a short delay is needed, apply this unconditionally.
Also bump up to 1ms sleep for extra legroom.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Daniel Drake 2011-09-07 10:22:09 +01:00 committed by Chris Ball
parent 55cd65e48b
commit 041beb1d53
1 changed files with 7 additions and 0 deletions
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7
drivers/mmc/core/core.c
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@ -1214,6 +1214,13 @@ static void mmc_power_off(struct mmc_host *host)
host->ios.timing = MMC_TIMING_LEGACY;
mmc_set_ios(host);
/*
* Some configurations, such as the 802.11 SDIO card in the OLPC
* XO-1.5, require a short delay after poweroff before the card
* can be successfully turned on again.
*/
mmc_delay(1);
mmc_host_clk_release(host);
}