drivers/gpu/drm/drm_eld.c

   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  */
  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  */
  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);