On Wed 2019-10-09 17:12:24, Tony Lindgren wrote: > We're missing initializing the PRM_VOLTCTRL register for voltage > controller. Let's add omap4_vc_init_pmic_signaling() similar to what we > have for omap3 and enable voltage control for retention. > > This brings down droid4 power consumption with mainline kernel to somewhere > between 40 and 50mW from about 70 to 80 mW for the whole device when running > idle with LCD and backlight off, WLAN connected, and USB and modem modules > unloaded. > > Mostly just rmmod of omap2430, ohci-platform and phy-mapphone-mdm6600 are > needed to idle USB and shut down the modem. And after that measuring idle > power consumption can be done with reading sysfs entry every ten seconds for > /sys/class/power_supply/battery/power_avg. Then rmmod of phy-cpcap-usb will > save few more mW, but will disable the debug UART. > > Note that sometimes CM_L4PER_UART1_CLKCTRL at 0x4a009540 does not idle > properly after unloading of phy-mapphone-mdm6600. Acked-by: Pavel Machek <pavel@xxxxxx> Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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