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hwmon: (applesmc) Shorten minimum wait time 

The 2012 series of MacBooks have a faster SMC, and the current driver
timings do not work at all. Tests show that decreasing the minimum
wait time, from 64 us to 16 us, works well. Since this is still larger
than the original minimum of 10 us used before 2008, there is nothing
inherently problematic with changing it. The fail frequency on older
machines seems to increase slightly, but not enough to be noticeable.

Tested on MBA11, MBA31, MBA5,2, MBP9,2.

The patch was originally written by adamski99 (ubuntuforums.org) and
later tested by janhouse (bbs.archlinux.org).

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
hifive-unleashed-5.1
Henrik Rydberg 2012-07-09 12:10:26 +02:00 committed by Guenter Roeck
parent 08cd6753d9
commit a332bf9a65
1 changed files with 1 additions and 1 deletions
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2
drivers/hwmon/applesmc.c
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@ -54,7 +54,7 @@
#define APPLESMC_MAX_DATA_LENGTH 32
/* wait up to 32 ms for a status change. */
#define APPLESMC_MIN_WAIT 0x0040
#define APPLESMC_MIN_WAIT 0x0010
#define APPLESMC_MAX_WAIT 0x8000
#define APPLESMC_STATUS_MASK 0x0f