tree dd61054cf57cc7a3743cddcb21dfe9a7c85dd8cc
parent fafcfda9e78cae8796d1799f14e6457790797555
author Russell King <rmk+kernel@arm.linux.org.uk> 1453815664 +0000
committer Ulf Hansson <ulf.hansson@linaro.org> 1456740197 +0100

mmc: sdhci: fix data timeout (part 2)

The calculation for the timeout based on the number of card clocks is
incorrect.  The calculation assumed:

	timeout in microseconds = clock cycles / clock in Hz

which is clearly a several orders of magnitude wrong.  Fix this by
multiplying the clock cycles by 1000000 prior to dividing by the Hz
based clock.  Also, as per part 1, ensure that the division rounds
up.

As this needs 64-bit math via do_div(), avoid it if the clock cycles
is zero.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v3.15+
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>