Patch up issue for inverted complementary output on Backlight

[HorrorTroll]

Description

• Fixed backlight issue that giving complementary output to active low, when BACKLIGHT_ON_STATE is 1.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout (addition or update)
• Documentation

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[zvecr]

Complementary output is inverted, so this configuration was intentional. Has this actually been validated to be not the case?

These backlight and rgb light bug fixes should also be submitted separately.

[sigprof]

Apparently the internal inversion happens only when both the normal and complementary outputs are enabled:

See also the code for the WS2812 PWM driver — it uses PWM_OUTPUT_ACTIVE_HIGH and PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH, and that driver would definitely break if an extra inversion would be applied.

[HorrorTroll]

Complementary output is inverted, so this configuration was intentional. Has this actually been validated to be not the case?

Yes, just like sigprof explain. The inverted wasn't be the case, unless both the normal and complementary are in use.

These backlight and rgb light bug fixes should also be submitted separately.

Thanks, I'll try to split it out.