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[Why & How] DCN4x ASICs have different DCCG logic for programming DP DTO. The current get_pixel_clk_frequency_100hz() function does not account for this. Rename the function to "get_dp_dto_frequency" to more accurately reflect its intended behaviour. Create a new function that correctly calculates the target pixel rate for DCN4.x DCCG design and use it. Reviewed-by: Leo Chen <leo.chen@amd.com> Signed-off-by: Ovidiu Bunea <ovidiu.bunea@amd.com> Signed-off-by: Ray Wu <ray.wu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>