forked from Minki/linux
9799aca203
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> |
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| .. | ||
| blizzard.h | ||
| board-ams-delta.h | ||
| board-sx1.h | ||
| board-voiceblue.h | ||
| board.h | ||
| clkdev_omap.h | ||
| clkdev.h | ||
| clock.h | ||
| clockdomain.h | ||
| common.h | ||
| control.h | ||
| cpu.h | ||
| display.h | ||
| dma.h | ||
| dmtimer.h | ||
| dsp_common.h | ||
| fpga.h | ||
| gpio-switch.h | ||
| gpio.h | ||
| gpmc-smc91x.h | ||
| gpmc.h | ||
| hardware.h | ||
| hwa742.h | ||
| i2c.h | ||
| io.h | ||
| iommu2.h | ||
| iommu.h | ||
| iovmm.h | ||
| irda.h | ||
| irqs.h | ||
| keypad.h | ||
| lcd_mipid.h | ||
| led.h | ||
| mailbox.h | ||
| mcbsp.h | ||
| mcspi.h | ||
| memory.h | ||
| menelaus.h | ||
| mmc.h | ||
| mux.h | ||
| nand.h | ||
| omap7xx.h | ||
| omap16xx.h | ||
| omap24xx.h | ||
| omap34xx.h | ||
| omap44xx.h | ||
| omap730.h | ||
| omap850.h | ||
| omap1510.h | ||
| omap_device.h | ||
| omap_hwmod.h | ||
| omap-alsa.h | ||
| omap-pm.h | ||
| onenand.h | ||
| param.h | ||
| powerdomain.h | ||
| prcm.h | ||
| sdrc.h | ||
| serial.h | ||
| smp.h | ||
| sram.h | ||
| system.h | ||
| tc.h | ||
| timer-gp.h | ||
| timex.h | ||
| uncompress.h | ||
| usb.h | ||
| vram.h | ||
| vrfb.h | ||