On some boards card power is hard wired to the slot and active regardless of host controller state. When runtime PM suspends such a host, certain cards may keep their current configuration (e.g. bus width), now when runtime PM resumes the host, communication with the card will fail. This was observed on AP4EVB with tmio_mmc and a b43 based SDIO card: http://marc.info/?l=linux-mmc&m=128854536521274&w=2 This patch, fixes the problem by resetting the SDIO card on power restore. Signed-off-by: Arnd Hannemann <arnd@xxxxxxxxxx> --- drivers/mmc/core/core.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 31ae07a..21cdee6 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1617,8 +1617,13 @@ int mmc_power_restore_host(struct mmc_host *host) } mmc_power_up(host); - ret = host->bus_ops->power_restore(host); + mmc_claim_host(host); + sdio_reset(host); + mmc_go_idle(host); + mmc_release_host(host); + + ret = host->bus_ops->power_restore(host); mmc_bus_put(host); return ret; -- 1.7.2.3 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
