1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2023 Intel Corporation
4 */
5
6 #include <linux/export.h>
7
8 #include <drm/drm_edid.h>
9 #include <drm/drm_eld.h>
10
11 #include "drm_crtc_internal.h"
12
13 /**
14 * drm_eld_sad_get - get SAD from ELD to struct cea_sad
15 * @eld: ELD buffer
16 * @sad_index: SAD index
17 * @cta_sad: destination struct cea_sad
18 *
19 * @return: 0 on success, or negative on errors
20 */
drm_eld_sad_get(const u8 * eld,int sad_index,struct cea_sad * cta_sad)21 int drm_eld_sad_get(const u8 *eld, int sad_index, struct cea_sad *cta_sad)
22 {
23 const u8 *sad;
24
25 if (sad_index >= drm_eld_sad_count(eld))
26 return -EINVAL;
27
28 sad = eld + DRM_ELD_CEA_SAD(drm_eld_mnl(eld), sad_index);
29
30 drm_edid_cta_sad_set(cta_sad, sad);
31
32 return 0;
33 }
34 EXPORT_SYMBOL(drm_eld_sad_get);
35
36 /**
37 * drm_eld_sad_set - set SAD to ELD from struct cea_sad
38 * @eld: ELD buffer
39 * @sad_index: SAD index
40 * @cta_sad: source struct cea_sad
41 *
42 * @return: 0 on success, or negative on errors
43 */
drm_eld_sad_set(u8 * eld,int sad_index,const struct cea_sad * cta_sad)44 int drm_eld_sad_set(u8 *eld, int sad_index, const struct cea_sad *cta_sad)
45 {
46 u8 *sad;
47
48 if (sad_index >= drm_eld_sad_count(eld))
49 return -EINVAL;
50
51 sad = eld + DRM_ELD_CEA_SAD(drm_eld_mnl(eld), sad_index);
52
53 drm_edid_cta_sad_get(cta_sad, sad);
54
55 return 0;
56 }
57 EXPORT_SYMBOL(drm_eld_sad_set);
58