The CTA data block in DisplayID does not have the bits from byte 3 that a CEA extension has. Only look for them in CEA extensions, but also look for them in all CEA extensions.
References: https://patchwork.freedesktop.org/patch/msgid/20220321044330.27723-1-cooper.... Signed-off-by: Jani Nikula jani.nikula@intel.com --- drivers/gpu/drm/drm_edid.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index b3aedeefed82..b6675f8638bb 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4959,16 +4959,21 @@ EXPORT_SYMBOL(drm_detect_hdmi_monitor); */ bool drm_detect_monitor_audio(struct edid *edid) { + struct drm_edid_iter edid_iter; const struct cea_db *db; struct cea_db_iter iter; - const u8 *edid_ext; + const u8 *cea; bool has_audio = false;
- edid_ext = drm_find_cea_extension(edid); - if (!edid_ext) - goto end; - - has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); + drm_edid_iter_begin(edid, &edid_iter); + drm_edid_iter_for_each(cea, &edid_iter) { + if (cea[0] == CEA_EXT) { + has_audio = cea[3] & EDID_BASIC_AUDIO; + if (has_audio) + break; + } + } + drm_edid_iter_end(&edid_iter);
if (has_audio) { DRM_DEBUG_KMS("Monitor has basic audio support\n");