NV_CIO_CR_OFFSET_INDEX
regp->CRTC[NV_CIO_CR_OFFSET_INDEX] = fb->pitches[0] / 8;
regp->CRTC[NV_CIO_CR_OFFSET_INDEX] = drm_fb->pitches[0] >> 3;
crtc_wr_cio_state(crtc, regp, NV_CIO_CR_OFFSET_INDEX);