[PATCH v4 3/3] mmc: dw_mmc: Don't start command while data busy
From: Addy Ke
Date: Sat Feb 14 2015 - 01:18:42 EST
We should wait until unbusy before the next request.
But this does't need if the command is CMD13, which can access
SD Status register regardless of data busy.
Signed-off-by: Addy Ke <addy.ke@xxxxxxxxxxxxxx>
Changes in v4:
- CMD13 doesn't need wait until unbusy.
drivers/mmc/host/dw_mmc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index ac21863..692d97a 100644
@@ -1076,6 +1076,10 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+ /* Wait until unbusy if the command isn't CMD13 */
+ if (mrq->cmd->opcode != MMC_SEND_STATUS)
* The check for card presence and queueing of the request must be
* atomic, otherwise the card could be removed in between and the
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