linux-kernel - [PATCH v2 2/2] mmc: dw_mmc: Don't start command while data busy

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Message-Id: <1423466726-20833-3-git-send-email-addy.ke@rock-chips.com>
Date:	Mon,  9 Feb 2015 15:25:26 +0800
From:	Addy Ke <addy.ke@...k-chips.com>
To:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
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	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
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	kever.yang@...k-chips.com, zhangqing@...k-chips.com,
	hl@...k-chips.com, Addy Ke <addy.ke@...k-chips.com>
Subject: [PATCH v2 2/2] mmc: dw_mmc: Don't start command while data busy

We should wait for data busy here in non-volt-switch state.
This may happend when sdio sends CMD53.

Signed-off-by: Addy Ke <addy.ke@...k-chips.com>
---
 drivers/mmc/host/dw_mmc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index b0b57e3..b40080d 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1007,6 +1007,13 @@ static void __dw_mci_start_request(struct dw_mci *host,
 		mci_writel(host, BLKSIZ, data->blksz);
 	}
 
+	/*
+	 * We should wait for data busy here in non-volt-switch state.
+	 * This may happend when sdio sends CMD53.
+	 */
+	if (host->state != STATE_WAITING_CMD11_DONE)
+		dw_mci_wait_busy(slot);
+
 	cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
 
 	/* this is the first command, send the initialization clock */
-- 
1.8.3.2


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