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[Why] Some LED panel drivers might not like fractional PWM. In such cases, backlight flickering may be observed. [How] Add a DC feature mask to disable fractional PWM, and associate it with the preexisting dc_config flag. The flag is only plumbed through the dmcu firmware, so plumb it through the driver path as well. To disable, add the following to the linux cmdline: amdgpu.dcfeaturemask=0x4 Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204957 Signed-off-by: Leo Li <sunpeng.li@amd.com> Reviewed-by: Anthony Koo <anthony.koo@amd.com> Tested-by: Lukáš Krejčí <lskrejci@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>