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arm64: dts: oplus: lower max brightness level to 2047
It turns out that brightness level 4095 corresponds exactly to the same level as High Brightness Mode. That doesn't sound all that bad at first, until you realize that the user might assume that the range of brightness levels that they can set w/o HBM is considered to be relatively safe. As such, we can end up with users setting max 4096 brightness all the time when using their phone, because in their minds, it's still "safer" than HBM. Not only that, but for our panel, when disabling HBM, the brightness level that the panel returns to seems to be the equivalent of doing `bl_lvl % 2048`. As such, if the backlight level was set somewere around 87% in Android (corresponding to around ~2048 in the bl_lvl value), then turning off HBM (or exiting out of udfps fp auth) results in the backlight drastically dropping until the user readjusts the backlight again. Now, the latter problem (brightness wraparound) could be solved by just immediately setting the bl_lvl again after turning off HBM, but that leaves the former problem still. And that begs the question: what does OxygenOS do? As it turns out, on stock OOS 12, the max brightness level that OOS will let you set *normally* is 2047. The reason why the dts has the max level set to 4095 instead is because OOS has a feature that lets you increase the max brightness to 4095 while watching HDR content. We don't have such a feature in AOSP. As such, it makes more sense to just lower the max brightness range to 2047. HBM will still work as expected. Change-Id: I30a96aa0b25d2694be0c678afa136957fee2f95c
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