From 6b93d01fe5971951911a070f51f412d50e9536dc Mon Sep 17 00:00:00 2001 From: Ohad Ben-Cohen Date: Tue, 5 Apr 2011 17:43:21 +0300 Subject: mmc: do not switch to 1-bit mode if not required 6b5eda36 followed SDIO spec part E1 section 8, which states that in case SDIO interrupts are being used to wake up a suspended host, then it is required to switch to 1-bit mode before stopping the clock. Before switching to 1-bit mode (or back to 4-bit mode on resume), make sure that SDIO interrupts are really being used to wake the host. This is helpful for devices which have an external irq line (e.g. wl1271), and do not use SDIO interrupts to wake up the host. In this case, switching to 1-bit mode (and back to 4-bit mode on resume) is not necessary. Reported-by: Eliad Peller Signed-off-by: Ohad Ben-Cohen Signed-off-by: Chris Ball --- drivers/mmc/core/sdio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index 0f7d436..4221670 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -625,7 +625,7 @@ static int mmc_sdio_suspend(struct mmc_host *host) } } - if (!err && mmc_card_keep_power(host)) { + if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { mmc_claim_host(host); sdio_disable_wide(host->card); mmc_release_host(host); @@ -648,7 +648,7 @@ static int mmc_sdio_resume(struct mmc_host *host) if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) err = mmc_sdio_init_card(host, host->ocr, host->card, mmc_card_keep_power(host)); - else if (mmc_card_keep_power(host)) { + else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { /* We may have switched to 1-bit mode during suspend */ err = sdio_enable_4bit_bus(host->card); if (err > 0) { -- cgit v1.1