display: Allow HBM in manual brightness if no time limitation

If a display does not set time limitation for HBM, it means it can
safely run at HBM for as long as it wants. With this in mind, we can
allow HBM in manual brightness too for such displays. This still obeys
the thermal throttling and battery saver conditions for obvious reasons.

Change-Id: I18ca7748c1f32dca1e70497afd0b6df8ed81ad5d
Signed-off-by: Pranav Vashi <[email protected]>

Author: adithya2306

services/core/java/com/android/server/display/HighBrightnessModeController.java

@@ -379,8 +379,9 @@ boolean isHbmCurrentlyAllowed() {
         // brightness maximum; so we implement HDR-HBM in a way that doesn't adjust the max.
         // See {@link #getHdrBrightnessValue}.
         return !mIsHdrLayerPresent
-                && (mIsAutoBrightnessEnabled && mIsTimeAvailable && mIsInAllowedAmbientRange
-                && !mIsBlockedByLowPowerMode);
+                && ((mIsAutoBrightnessEnabled && mIsTimeAvailable && mIsInAllowedAmbientRange)
+                    || (!mIsAutoBrightnessEnabled && mHbmData.timeWindowMillis == 0))
+                && !mIsBlockedByLowPowerMode;
     }
 
     boolean deviceSupportsHbm() {