diff options
| author |   Hans de Goede <hdegoede@redhat.com> | 2015-09-22 17:30:25 +0200 |
|---|---|---|
| committer |   Ulf Hansson <ulf.hansson@linaro.org> | 2015-10-26 16:00:01 +0100 |
| commit | 5d3f6ef04d65dda92a3573841a7215fb05c347de (patch) | |
| tree | 84a4d767e9570826bf39ccc15dab87445f01e77d /drivers/mmc | |
| parent | mmc: Add mmc_is_io_op helper function (diff) | |
| download | linux-dev-5d3f6ef04d65dda92a3573841a7215fb05c347de.tar.xz linux-dev-5d3f6ef04d65dda92a3573841a7215fb05c347de.zip | |
mmc: Wait for card_busy before starting sdio requests
Some sdio wifi chips will not work properly if we try to start new
sdio-rw requests while the device is signalling that it is busy.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/core.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 2092a89dcf76..21cda23b247c 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -206,6 +206,23 @@ static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) return; } + /* + * For sdio rw commands we must wait for card busy otherwise some + * sdio devices won't work properly. + */ + if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) { + int tries = 500; /* Wait aprox 500ms at maximum */ + + while (host->ops->card_busy(host) && --tries) + mmc_delay(1); + + if (tries == 0) { + mrq->cmd->error = -EBUSY; + mmc_request_done(host, mrq); + return; + } + } + host->ops->request(host, mrq); } |