From: Tony Lindgren tony@atomide.com
commit ddb52945999dcf35787bf221b62108806182578d upstream.
In addition to using vcsi regulator for the display, looks like droid4 is using vcsi regulator to trigger off mode internally with the PMIC firmware when the SoC enters deeper idle states. This is configured in the Motorola Mapphone Linux kernel sources as "zerov_regulator".
As we currently don't support off mode during idle for omap4, we must prevent vcsi from being disabled when the display is blanked to prevent the PMIC change to off mode. Otherwise the device will hang on entering idle when the display is blanked.
Before commit 089b3f61ecfc ("regulator: core: Let boot-on regulators be powered off"), the boot-on regulators never got disabled like they should and vcsi did not get turned off on idle.
Let's fix the issue by setting vcsi to always-on for now. Later on we may want to claim the vcsi regulator also in the PM code if needed.
Fixes: 089b3f61ecfc ("regulator: core: Let boot-on regulators be powered off") Cc: Merlijn Wajer merlijn@wizzup.org Cc: Pavel Machek pavel@ucw.cz Cc: Sebastian Reichel sre@kernel.org Signed-off-by: Tony Lindgren tony@atomide.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi +++ b/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi @@ -165,12 +165,12 @@ regulator-enable-ramp-delay = <1000>; };
- /* Used by DSS */ + /* Used by DSS and is the "zerov_regulator" trigger for SoC off mode */ vcsi: VCSI { regulator-min-microvolt = <1800000>; regulator-max-microvolt = <1800000>; regulator-enable-ramp-delay = <1000>; - regulator-boot-on; + regulator-always-on; };
vdac: VDAC {