linux-kernel - [PATCH 1/3] mmc: mmc: use ops->card_busy() to check card status in __mmc

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Date:	Thu, 19 May 2016 16:47:40 +0800
From:	Chaotian Jing <chaotian.jing@...iatek.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Chaotian Jing <chaotian.jing@...iatek.com>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	<srv_heupstream@...iatek.com>, Sascha Hauer <kernel@...gutronix.de>
Subject: [PATCH 1/3] mmc: mmc: use ops->card_busy() to check card status in __mmc_switch()

some MMC host do not support MMC_CAP_WAIT_WHILE_BUSY but provides
ops->card_busy(), So, add this method to check card status after
switch command.

Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
---
 drivers/mmc/core/mmc_ops.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 62355bd..32de144 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -480,6 +480,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 	u32 status = 0;
 	bool use_r1b_resp = use_busy_signal;
 	bool expired = false;
+	bool busy = false;
 
 	mmc_retune_hold(host);
 
@@ -535,19 +536,24 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 	/* Must check status to be sure of no errors. */
 	timeout = jiffies + msecs_to_jiffies(timeout_ms);
 	do {
+		/*
+		 * Due to the possibility of being preempted after
+		 * sending the status command, check the expiration
+		 * time first.
+		 */
+		expired = time_after(jiffies, timeout);
 		if (send_status) {
-			/*
-			 * Due to the possibility of being preempted after
-			 * sending the status command, check the expiration
-			 * time first.
-			 */
-			expired = time_after(jiffies, timeout);
 			err = __mmc_send_status(card, &status, ignore_crc);
 			if (err)
 				goto out;
 		}
 		if ((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
 			break;
+		if (host->ops->card_busy) {
+			if (!host->ops->card_busy(host))
+				break;
+			busy = true;
+		}
 		if (mmc_host_is_spi(host))
 			break;
 
@@ -556,19 +562,20 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 		 * does'nt support MMC_CAP_WAIT_WHILE_BUSY, then we can only
 		 * rely on waiting for the stated timeout to be sufficient.
 		 */
-		if (!send_status) {
+		if (!send_status && !host->ops->card_busy) {
 			mmc_delay(timeout_ms);
 			goto out;
 		}
 
 		/* Timeout if the device never leaves the program state. */
-		if (expired && R1_CURRENT_STATE(status) == R1_STATE_PRG) {
+		if (expired &&
+		    (R1_CURRENT_STATE(status) == R1_STATE_PRG || busy)) {
 			pr_err("%s: Card stuck in programming state! %s\n",
 				mmc_hostname(host), __func__);
 			err = -ETIMEDOUT;
 			goto out;
 		}
-	} while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
+	} while (R1_CURRENT_STATE(status) == R1_STATE_PRG || busy);
 
 	err = mmc_switch_status_error(host, status);
 out:
-- 
1.8.1.1.dirty