[RFC PATCH 2/2] mmc: core: sdio: claim host before power up or power off

From: Kishon Vijay Abraham I
Date: Mon Aug 24 2015 - 06:15:39 EST

mmc_sdio_runtime_resume and mmc_sdio_runtime_suspend does power up and
power off respectively but does so without claiming the host. Among other
things mmc_claim_host inovkes pm_runtime_get_sync to enable the clocks.
Invoke mmc_claim_host before mmc_power_up and mmc_power_off in
mmc_sdio_runtime_resume and mmc_sdio_runtime_suspend respectively.

This is required since certain platforms (like TI SoCs) access
the controller registers during power up.

Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
drivers/mmc/core/sdio.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 0cbbfb8..40795b2 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -1023,16 +1023,24 @@ static int mmc_sdio_power_restore(struct mmc_host *host)

static int mmc_sdio_runtime_suspend(struct mmc_host *host)
+ mmc_claim_host(host);
/* No references to the card, cut the power to it. */
+ mmc_release_host(host);
return 0;

static int mmc_sdio_runtime_resume(struct mmc_host *host)
+ int ret;
+ mmc_claim_host(host);
/* Restore power and re-initialize. */
mmc_power_up(host, host->card->ocr);
- return mmc_sdio_power_restore(host);
+ ret = _mmc_sdio_power_restore(host);
+ mmc_release_host(host);
+ return ret;

static int mmc_sdio_reset(struct mmc_host *host)

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