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

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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,
	rdunlap@...radead.org, tgih.jun@...sung.com,
	jh80.chung@...sung.com, chris@...ntf.net, ulf.hansson@...aro.org,
	dinguyen@...era.com, heiko@...ech.de, olof@...om.net,
	dianders@...omium.org, sonnyrao@...omium.org, amstan@...omium.org,
	djkurtz@...omium.org
Cc:	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, zhenfu.fang@...k-chips.com,
	cf@...k-chips.com, lintao@...k-chips.com, chenfen@...k-chips.com,
	zyf@...k-chips.com, xjq@...k-chips.com, huangtao@...k-chips.com,
	zyw@...k-chips.com, yzq@...k-chips.com, hj@...k-chips.com,
	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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