diff options
Diffstat (limited to 'drivers/acpi/osl.c')
| -rw-r--r-- | drivers/acpi/osl.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index fed446aace42..5ff343096ece 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -607,7 +607,27 @@ acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler) void acpi_os_sleep(u64 ms) { - msleep(ms); + u64 usec = ms * USEC_PER_MSEC, delta_us = 50; + + /* + * Use a hrtimer because the timer wheel timers are optimized for + * cancelation before they expire and this timer is not going to be + * canceled. + * + * Set the delta between the requested sleep time and the effective + * deadline to at least 50 us in case there is an opportunity for timer + * coalescing. + * + * Moreover, longer sleeps can be assumed to need somewhat less timer + * precision, so sacrifice some of it for making the timer a more likely + * candidate for coalescing by setting the delta to 1% of the sleep time + * if it is above 5 ms (this value is chosen so that the delta is a + * continuous function of the sleep time). + */ + if (ms > 5) + delta_us = (USEC_PER_MSEC / 100) * ms; + + usleep_range(usec, usec + delta_us); } void acpi_os_stall(u32 us) |