radeon_dp_getdpcd
if (radeon_dp_getdpcd(radeon_connector))
radeon_dp_getdpcd(radeon_connector);
radeon_dp_getdpcd(radeon_connector);
if (radeon_dp_getdpcd(radeon_connector))
if (!radeon_dp_getdpcd(radeon_connector))
extern bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector);