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  27. 18 Sep, 2014 6 commits
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  31. 17 Jun, 2014 1 commit
    • Arnd Bergmann's avatar
      ARM: omap2: fix am43xx dependency on l2x0 cache · 2ad501cc
      Arnd Bergmann authored 
      Commit d941f86f ("ARM: l2c: AM43x: add L2 cache support") enabled
the L2 cache support for the am43xx SoC, but caused a build regression
when the driver for that cache controller is disabled:

arch/arm/mach-omap2/built-in.o: In function `am43xx_init_early':
:(.init.text+0xb20): undefined reference to `omap_l2_cache_init'

This did not happen for OMAP4, which has the same call, but enables
the l2x0 driver unconditionally. We could do the same thing for
am43xx, but it seems better to allow turning it off and make the
code work in either case.

This adds an inline wrapper for omap_l2_cache_init for the disabled
case, and removes the 'select' from OMAP4 so it becomes a user
visible option.
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
Cc: linux-omap@vger.kernel.org
      2ad501cc
  33. 28 May, 2014 1 commit
  35. 06 May, 2014 2 commits
    • Tony Lindgren's avatar
      ARM: OMAP2+: Enable CPUidle in omap2plus_defconfig · 57b05572
      Tony Lindgren authored 
      Enable CPUidle so it's easier for maintainers to notice
if some future code changes cause regressions.

Cc: Kevin Hilman <khilman@linaro.org>
Cc: Nishanth Menon <nm@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Tero Kristo <t-kristo@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      57b05572
    • Tony Lindgren's avatar
      ARM: dts: Enable N900 keyboard sleep leds by default · c1be2032
      Tony Lindgren authored 
      On N900 there are nice LEDs that show the state of the
sys_clkreq and sys_off_mode pins.

These LEDs go low when the system enters deeper idle
states. The left LED shows the state of the sys_clkreq
pin, and goes off during retention idle. The right LED
shows the state of sys_off_mode pin and both go off
during off idle.

As N900 is a battery operated device, these LEDs should
be off most of the time. So let's enable them by default
so we can make sure the system is mostly idle.

This allows the maintainers to also immediately test
patches for PM regressions by looking at the LEDs,
which certainly makes my life easier.

The LED can naturally be disabled during runtime with:

# echo none > /sys/class/leds/debug::sleep/trigger

Note that we don't currently have support for omap3
errata 1.158 that remuxes GPIO pins to INPUT_PULLUP |
MUX_MODE7 for the duration of idle. This means that the
GPIO pins set high will go down during off idle. In this
case it does not matter as the sys_off_mode goes down
too, but there's still a slim chance of false off idle
LED signals. If in doubt, false LED signals can be
verified by the sys_off_mode or vdd_core values.

Also note that to allow the UARTs to autoidle, the
following needs to be run on N900 to enable off idle:

#!/bin/sh
uarts=$(find /sys/class/tty/ttyO*/device/power/ -type d)
for uart in $uarts; do
	echo 3000 > $uart/autosuspend_delay_ms
done

uarts=$(find /sys/class/tty/ttyO*/power/ -type d)
for uart in $uarts; do
	echo enabled > $uart/wakeup
	echo auto > $uart/control
done

echo 1 > /sys/kernel/debug/pm_debug/enable_off_mode

For retention idle, change the above to set 0 to
enable_off_mode.

Also note that without the twl4030 PM scripts the actual
voltage scaling won't happen for off idle so we only get
voltage scaling over I2C4 for retention idle. I'll do
some device tree patches for those also a bit later on.

Cc: Kevin Hilman <khilman@linaro.org>
Cc: Nishanth Menon <nm@ti.com>
Cc: Pali Rohár <pali.rohar@gmail.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Tero Kristo <t-kristo@ti.com>
Acked-by: default avatarAaro Koskinen <aaro.koskinen@iki.fi>
[tony@atomide.com: also make sure the LEDs get built to see PM regressions]
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      c1be2032
  37. 18 Apr, 2014 1 commit
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