[PATCH v4 3/3] mmc: dw_mmc: Don't start command while data busy
From: Addy Ke <hidden>
Date: 2015-02-14 06:18:39
Also in:
linux-mmc, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, synopsys designware mmc/sd/sdio driver, the rest · Maintainers:
Ulf Hansson, Jaehoon Chung, Shawn Lin, Linus Torvalds
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 <redacted> --- 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
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c@@ -1076,6 +1076,10 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) WARN_ON(slot->mrq); + /* Wait until unbusy if the command isn't CMD13 */ + if (mrq->cmd->opcode != MMC_SEND_STATUS) + dw_mci_wait_busy(slot); + /* * 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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1.8.3.2