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@xxxxxxxxxx>
---
drivers/mmc/core/core.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 0520064..ced66b8 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -204,6 +204,23 @@ 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);
}
--
2.4.3
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