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author | Kevin Hilman <khilman@deeprootsystems.com> | 2010-01-26 20:13:02 -0700 |
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committer | Paul Walmsley <paul@pwsan.com> | 2010-01-26 20:13:02 -0700 |
commit | 9799aca2032ad53418ff4bc0d1a6f2cb4f79b6c0 (patch) | |
tree | f8cd85a140eb5d1bf77fff3dbec78ae93f6be183 /arch/arm/mach-omap2/omap_hwmod.c | |
parent | f0271d65f9ac511d2e3e1fdbcd7418a5a7df0769 (diff) |
OMAP: omap_device: optionally auto-adjust device activate/deactivate latencies
First, this patch adds new worst-case latency values to the
omap_device_pm_latency struct. Here the worst-case measured latencies
for the activate and deactivate hooks are stored.
In addition, add an option to auto-adjust the latency values used for
device activate/deactivate.
By setting a new 'OMAP_DEVICE_LATENCY_AUTO_ADJUST' flag in the
omap_device_pm_latency struct, the omap_device layer automatically
adjusts the activate/deactivate latencies to the worst-case measured
values.
Anytime a new worst-case value is found, it is printed to the console.
Here is an example log during boot using UART2 s an example. After
boot, the OPP is manually changed to the 125MHz OPP:
[...]
Freeing init memory: 128K
omap_device: serial8250.2: new worst case deactivate latency 0: 30517
omap_device: serial8250.2: new worst case activate latency 0: 30517
omap_device: serial8250.2: new worst case activate latency 0: 218139648
omap_device: serial8250.2: new worst case deactivate latency 0: 61035
omap_device: serial8250.2: new worst case activate latency 0: 278076171
omap_device: serial8250.2: new worst case activate latency 0: 298614501
omap_device: serial8250.2: new worst case activate latency 0: 327331542
/ # echo 125000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
omap_device: serial8250.2: new worst case deactivate latency 0: 91552
Motivation: this can be used as a technique to automatically determine
the worst case latency values. The current method of printing a
warning on every violation is too noisy to actually interact the
console in order to set low OPP to discover latencies.
Another motivation for this patch is that the activate/deactivate
latenices can vary depending on the idlemode of the device. While
working on the UARTs, I noticed that when using no-idle, the activate
latencies were as high as several hundred msecs as shown above. When
the UARTs are in smart-idle, the max latency is well under 100 usecs.
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap2/omap_hwmod.c')
0 files changed, 0 insertions, 0 deletions