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this set adds support for removal of gpu drm dead code. patch3 is similar with patch 1: `num` is a data of u8 type and ATOM_MAX_HW_I2C_READ == 255, so there is a impossible condition '(num > 255) => (0-255 > 255)'. Signed-off-by: Pan Zhang <zhangpan26@huawei.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>