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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: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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@ -206,6 +206,23 @@ static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
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return;
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}
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/*
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* For sdio rw commands we must wait for card busy otherwise some
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* sdio devices won't work properly.
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*/
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if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) {
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int tries = 500; /* Wait aprox 500ms at maximum */
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while (host->ops->card_busy(host) && --tries)
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mmc_delay(1);
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if (tries == 0) {
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mrq->cmd->error = -EBUSY;
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mmc_request_done(host, mrq);
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return;
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}
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}
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host->ops->request(host, mrq);
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}
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