* Ran Shalit <[email protected]> [141116 12:13]:
> Hello,
>
> I'm using OMAP3530 with custom board. I have enabled all power mode
> features as described in PSP wiki, but it still fails to enter any
> state different from state0.
Works for me with pretty much all omap3 boards I have here with
mainline kernel since v3.17 using omap2plus_defconfig. And the
following script to idle uarts and enable off-idle (or retention).
USB needs to be disconnected and EHCI probably still cannot be
enabled.
> The next thing was trying to get the uart to sleep (though there might
> be also problems with other domains ?) .
>
> On trying to enable uart as wakeup source I get the following:
>
> echo enabled > /sys/devices/platform/omap/omap_uart.2/power/wakeup
>
> cat /sys/devices/platform/omap/omap_uart.2/power/wakeup
>
> #> disabled (?????)
>
> echo 1 > /sys/devices/platform/omap/omap_uart.2/sleep_timeout
> ~ # [ 85.006622] omap_device: omap_uart.2: new worst case deactivate
> latency 0: 61035
> [ 85.559844] omap_device: omap_uart.2: new worst case activate
> latency 0: 61035
> [ 982.415161] omap_device: omap_uart.2: new worst case deactivate
> latency 0: 91552
>
> < console hangs here >
Sounds like you need to enable the wake-up interrupt for the UART.
See the interrupts-extended entry for many omap3-*.dts files:
interrupts-extended = <&intc 74 &omap3_pmx_core OMAP3_UART3_RX>;
If you get it working, care to update the instructions in the wiki
too?
Regards,
Tony
8< ----------------------
#!/bin/bash
uarts=$(find /sys/class/tty/tty[SO]*/device/power/ -type d)
for uart in $uarts; do
echo 3000 > $uart/autosuspend_delay_ms 2>&1
done
uarts=$(find /sys/class/tty/ttyO*/power/ -type d 2>/dev/null)
for uart in $uarts; do
echo enabled > $uart/wakeup 2>&1
echo auto > $uart/control 2>&1
done
echo 1 > /sys/kernel/debug/pm_debug/enable_off_mode
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