1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 5 6 #include <drm/drm_edid.h> 7 #include <drm/drm_eld.h> 8 9 #include "drm_internal.h" 10 11 /** 12 * drm_eld_sad_get - get SAD from ELD to struct cea_sad 13 * @eld: ELD buffer 14 * @sad_index: SAD index 15 * @cta_sad: destination struct cea_sad 16 * 17 * @return: 0 on success, or negative on errors 18 */ 19 int drm_eld_sad_get(const u8 *eld, int sad_index, struct cea_sad *cta_sad) 20 { 21 const u8 *sad; 22 23 if (sad_index >= drm_eld_sad_count(eld)) 24 return -EINVAL; 25 26 sad = eld + DRM_ELD_CEA_SAD(drm_eld_mnl(eld), sad_index); 27 28 drm_edid_cta_sad_set(cta_sad, sad); 29 30 return 0; 31 } 32 EXPORT_SYMBOL(drm_eld_sad_get); 33 34 /** 35 * drm_eld_sad_set - set SAD to ELD from struct cea_sad 36 * @eld: ELD buffer 37 * @sad_index: SAD index 38 * @cta_sad: source struct cea_sad 39 * 40 * @return: 0 on success, or negative on errors 41 */ 42 int drm_eld_sad_set(u8 *eld, int sad_index, const struct cea_sad *cta_sad) 43 { 44 u8 *sad; 45 46 if (sad_index >= drm_eld_sad_count(eld)) 47 return -EINVAL; 48 49 sad = eld + DRM_ELD_CEA_SAD(drm_eld_mnl(eld), sad_index); 50 51 drm_edid_cta_sad_get(cta_sad, sad); 52 53 return 0; 54 } 55 EXPORT_SYMBOL(drm_eld_sad_set); 56