From: Chaotian Jing <chaotian.jing@mediatek.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Chaotian Jing <chaotian.jing@mediatek.com>,
Wolfram Sang <wsa+renesas@sang-engineering.com>,
Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
<linux-mmc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mediatek@lists.infradead.org>,
<srv_heupstream@mediatek.com>,
Sascha Hauer <kernel@pengutronix.de>
Subject: [PATCH 3/3] mmc: mmc: fix switch timeout issue caused by jiffies precision
Date: Thu, 19 May 2016 16:47:42 +0800 [thread overview]
Message-ID: <1463647662-27426-4-git-send-email-chaotian.jing@mediatek.com> (raw)
In-Reply-To: <1463647662-27426-1-git-send-email-chaotian.jing@mediatek.com>
with CONFIG_HZ=100, the precision of jiffies is 10ms, and the
generic_cmd6_time of some card is also 10ms. then, may be current
time is only 5ms, but already timed out caused by jiffies precision.
Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
---
drivers/mmc/core/mmc_ops.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 32de144..ad6e979 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -534,7 +534,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
timeout_ms = MMC_OPS_TIMEOUT_MS;
/* Must check status to be sure of no errors. */
- timeout = jiffies + msecs_to_jiffies(timeout_ms);
+ timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
do {
/*
* Due to the possibility of being preempted after
--
1.8.1.1.dirty
next prev parent reply other threads:[~2016-05-19 8:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-19 8:47 [PATCH v2] mmc: mmc: do not use CMD13 to get status after speed mode Chaotian Jing
2016-05-19 8:47 ` [PATCH 1/3] mmc: mmc: use ops->card_busy() to check card status in __mmc_switch() Chaotian Jing
2016-06-21 13:15 ` Ulf Hansson
2016-05-19 8:47 ` [PATCH 2/3] mmc: mmc: do not use CMD13 to get status after speed mode switch Chaotian Jing
2016-06-21 13:16 ` Ulf Hansson
2016-07-15 22:10 ` Bjorn Andersson
2016-07-18 12:50 ` Ulf Hansson
2016-07-18 13:38 ` Georgi Djakov
2016-07-19 9:31 ` Ulf Hansson
2016-07-19 16:27 ` Georgi Djakov
2016-05-19 8:47 ` Chaotian Jing [this message]
2016-06-21 13:15 ` [PATCH 3/3] mmc: mmc: fix switch timeout issue caused by jiffies precision Ulf Hansson
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