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| author | Clark Williams <williams@redhat.com> | 2012-04-14 09:13:39 -0500 |
|---|---|---|
| committer | Clark Williams <williams@redhat.com> | 2012-04-14 09:13:39 -0500 |
| commit | 4905660cd237e4c4ede46920851caa12739f006f (patch) | |
| tree | ef37e7c9f52c9ae9c2b206658556f37d67fe43eb /drivers/mmc/host/atmel-mci.c | |
| parent | 1b5e39fc18a1b8ff7ea425ce5f49307cb28a880f (diff) | |
| parent | 0147c2ae9d602b5791dae30322ece475271acd10 (diff) | |
Merge commit 'v3.2.15' into rt-3.2.15-rt24v3.2.15-rt24
Diffstat (limited to 'drivers/mmc/host/atmel-mci.c')
| -rw-r--r-- | drivers/mmc/host/atmel-mci.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 98969338dd84..093202482e54 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -480,7 +480,14 @@ err: static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host, unsigned int ns) { - return (ns * (host->bus_hz / 1000000) + 999) / 1000; + /* + * It is easier here to use us instead of ns for the timeout, + * it prevents from overflows during calculation. + */ + unsigned int us = DIV_ROUND_UP(ns, 1000); + + /* Maximum clock frequency is host->bus_hz/2 */ + return us * (DIV_ROUND_UP(host->bus_hz, 2000000)); } static void atmci_set_timeout(struct atmel_mci *host, |