do HW reset after each reading/writing/erasing

PATCH Superseded Chuanxiao Dong 1 participant 1 message Dec 1, 2010 MMC, SD and SDIO

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Chuanxiao Dong

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2010-12-01 12:49 UTC #0 lore raw

PATCH v4 4/4 do HW reset after each reading/writing/erasing

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From 0d704091ba1797eaba34230ac920866e68d1b21d Mon Sep 17 00:00:00 2001

From: Chuanxiao Dong <[email protected]>
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 <[email protected]>

---
 drivers/mmc/card/block.c |   10 ++++++++++
 drivers/mmc/core/core.c  |    2 ++
 2 files changed, 12 insertions(+), 0 deletions(-)

drivers/mmc/card/block.c +10 -0

index 217f820..c50f94b 100644
@@ -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);
 
 		/*

drivers/mmc/core/core.c +2 -0

index 530fc35..559ff1c 100644
@@ -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]);

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