linux-kernel - [PATCH 3.10 097/250] mmc: mxs-mmc: Fix additional cycles after transmission stop

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Message-Id: <1496876436-32402-98-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:58:03 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Ulf Hansson <ulf.hansson@...aro.org>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 097/250] mmc: mxs-mmc: Fix additional cycles after transmission stop

From: Stefan Wahren <stefan.wahren@...e.com>

commit 01167c7b9cbf099c69fe411a228e4e9c7104e123 upstream.

According to the code the intention is to append 8 SCK cycles
instead of 4 at end of a MMC_STOP_TRANSMISSION command. But this
will never happened because it's an AC command not an ADTC command.
So fix this by moving the statement into the right function.

Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Fixes: e4243f13d10e (mmc: mxs-mmc: add mmc host driver for i.MX23/28)
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/mmc/host/mxs-mmc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index f3a4232..01951cd 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -312,6 +312,9 @@ static void mxs_mmc_ac(struct mxs_mmc_host *host)
 	cmd0 = BF_SSP(cmd->opcode, CMD0_CMD);
 	cmd1 = cmd->arg;
 
+	if (cmd->opcode == MMC_STOP_TRANSMISSION)
+		cmd0 |= BM_SSP_CMD0_APPEND_8CYC;
+
 	if (host->sdio_irq_en) {
 		ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
 		cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
@@ -420,8 +423,7 @@ static void mxs_mmc_adtc(struct mxs_mmc_host *host)
 		       ssp->base + HW_SSP_BLOCK_SIZE);
 	}
 
-	if ((cmd->opcode == MMC_STOP_TRANSMISSION) ||
-	    (cmd->opcode == SD_IO_RW_EXTENDED))
+	if (cmd->opcode == SD_IO_RW_EXTENDED)
 		cmd0 |= BM_SSP_CMD0_APPEND_8CYC;
 
 	cmd1 = cmd->arg;
-- 
2.8.0.rc2.1.gbe9624a