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Commit 5d3f6ef0 authored by Hans de Goede's avatar Hans de Goede Committed by Ulf Hansson
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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: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent de98c556

drivers/mmc/core/core.c

+17 −0
Original line number Diff line number Diff line
@@ -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);

}