linux-kernel - [PATCH V15 15/22] mmc: block: Check for transfer state in card_busy

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Message-Id: <1511962879-24262-16-git-send-email-adrian.hunter@intel.com>
Date:   Wed, 29 Nov 2017 15:41:12 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Bough Chen <haibo.chen@....com>,
        Alex Lemberg <alex.lemberg@...disk.com>,
        Mateusz Nowak <mateusz.nowak@...el.com>,
        Yuliy Izrailov <Yuliy.Izrailov@...disk.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Dong Aisheng <dongas86@...il.com>,
        Das Asutosh <asutoshd@...eaurora.org>,
        Zhangfei Gao <zhangfei.gao@...il.com>,
        Sahitya Tummala <stummala@...eaurora.org>,
        Harjani Ritesh <riteshh@...eaurora.org>,
        Venu Byravarasu <vbyravarasu@...dia.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH V15 15/22] mmc: block: Check for transfer state in card_busy_detect()

The card is required to return to transfer state. Since that is the state
required to start another transfer, check for that state instead of
programming state.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 drivers/mmc/core/block.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index f7c387c27ac0..0b40fc2ebf77 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -922,6 +922,16 @@ static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
 	return 0;
 }
 
+static inline bool mmc_blk_in_tran_state(u32 status)
+{
+	/*
+	 * Some cards mishandle the status bits, so make sure to check both the
+	 * busy indication and the card state.
+	 */
+	return status & R1_READY_FOR_DATA &&
+	       (R1_CURRENT_STATE(status) == R1_STATE_TRAN);
+}
+
 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 			    bool hw_busy_detect, struct request *req,
 			    u32 *resp_errs)
@@ -954,9 +964,9 @@ static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 		 * leaves the program state.
 		 */
 		if (done) {
-			pr_err("%s: Card stuck in programming state! %s %s\n",
+			pr_err("%s: Card stuck in wrong state! %s %s status: %#x\n",
 				mmc_hostname(card->host),
-				req->rq_disk->disk_name, __func__);
+				req->rq_disk->disk_name, __func__, status);
 			return -ETIMEDOUT;
 		}
 
@@ -965,8 +975,7 @@ static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 		 * so make sure to check both the busy
 		 * indication and the card state.
 		 */
-	} while (!(status & R1_READY_FOR_DATA) ||
-		 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
+	} while (!mmc_blk_in_tran_state(status));
 
 	return err;
 }
-- 
1.9.1