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mmc: sdhci: fix data timeout (part 1)

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commit fafcfda9e7 upstream.

The data timeout gives the minimum amount of time that should be
waited before timing out if no data is received from the card.
Simply dividing the nanosecond part by 1000 does not give this
required guarantee, since such a division rounds down.  Use
DIV_ROUND_UP() to give the desired timeout.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Russell King
2016-01-26 13:40:58 +00:00
committed by Greg Kroah-Hartman
parent 0a060276f0
commit cd3c71fbb7
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/host/sdhci.c
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@@ -666,7 +666,7 @@ static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
if (!data)
target_timeout = cmd->busy_timeout * 1000;
else {
target_timeout = data->timeout_ns / 1000;
target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
if (host->clock)
target_timeout += data->timeout_clks / host->clock;
}