linux-kernel - [PATCH v4 4/4]do HW reset after each reading/writing/erasing

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Message-ID: <20101201124952.GE5421@intel.com>
Date:	Wed, 1 Dec 2010 20:49:52 +0800
From:	Chuanxiao Dong <chuanxiao.dong@...el.com>
To:	linux-mmc@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, cjb@...top.org,
	arjan@...ux.intel.com, alan@...ux.intel.com,
	akpm@...ux-foundation.org
Subject: [PATCH v4 4/4]do HW reset after each reading/writing/erasing

>From 0d704091ba1797eaba34230ac920866e68d1b21d Mon Sep 17 00:00:00 2001
From: Chuanxiao Dong <chuanxiao.dong@...el.com>
Date: Wed, 1 Dec 2010 20:24:00 +0800
Subject: [PATCH 4/4] add HW reset after each read/write/erase

Driver can do a HW reset for eMMC card if read/write/erase
occures timeout error.

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@...el.com>
---
 drivers/mmc/card/block.c |   10 ++++++++++
 drivers/mmc/core/core.c  |    2 ++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 217f820..c50f94b 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -424,6 +424,16 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
 
 		mmc_wait_for_req(card->host, &brq.mrq);
 
+		/*
+		 * Check if need to do HW reset.
+		 */
+		if (brq.cmd.error)
+			mmc_handle_timeout_error(card->host, brq.cmd.error);
+		else if (brq.data.error)
+			mmc_handle_timeout_error(card->host, brq.data.error);
+		else if (brq.stop.error)
+			mmc_handle_timeout_error(card->host, brq.stop.error);
+
 		mmc_queue_bounce_post(mq);
 
 		/*
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 530fc35..559ff1c 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1382,6 +1382,8 @@ static int mmc_do_erase(struct mmc_card *card, unsigned int from,
 	cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 	mmc_set_erase_timeout(card, &cmd, arg, qty);
 	err = mmc_wait_for_cmd(card->host, &cmd, 0);
+	/* Before return, check whether can do a HW reset */
+	mmc_handle_timeout_error(card->host, cmd.error);
 	if (err) {
 		printk(KERN_ERR "mmc_erase: erase error %d, status %#x\n",
 		       err, cmd.resp[0]);
-- 
1.6.6.1

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