vlv_iosf_sb_write
vlv_iosf_sb_write(&i915->drm, VLV_IOSF_SB_PUNIT, VLV_TURBO_SOC_OVERRIDE, val);
vlv_iosf_sb_write(&i915->drm, VLV_IOSF_SB_PUNIT, VLV_TURBO_SOC_OVERRIDE, val);
err = vlv_iosf_sb_write(&i915->drm, VLV_IOSF_SB_PUNIT, PUNIT_REG_GPU_FREQ_REQ, val);
.write = vlv_iosf_sb_write,
int vlv_iosf_sb_write(struct drm_device *drm, enum vlv_iosf_sb_unit unit, u32 addr, u32 val);