Commit 041beb1d authored Sep 07, 2011 by Daniel Drake Committed by Chris Ball Oct 26, 2011

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>

parent 55cd65e4

drivers/mmc/core/core.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}