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drm/edid: check basic audio support on CEA extension block

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commit 5662abf6e2 upstream.

Tag code stored in bit7:5 for CTA block byte[3] is not the same as
CEA extension block definition. Only check CEA block has
basic audio support.

v3: update commit message.

Cc: stable@vger.kernel.org
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Shawn C Lee <shawn.c.lee@intel.com>
Cc: intel-gfx <intel-gfx@lists.freedesktop.org>
Signed-off-by: Cooper Chiou <cooper.chiou@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
Fixes: e28ad544f4 ("drm/edid: parse CEA blocks embedded in DisplayID")
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220324061218.32739-1-shawn.c.lee@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Cooper Chiou
2022-03-24 14:12:18 +08:00
committed by Dom Cobley
parent 89c0af71c9
commit e6f88767ea
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/drm_edid.c
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@@ -4806,7 +4806,8 @@ bool drm_detect_monitor_audio(struct edid *edid)
if (!edid_ext)
goto end;
has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
has_audio = (edid_ext[0] == CEA_EXT &&
(edid_ext[3] & EDID_BASIC_AUDIO) != 0);
if (has_audio) {
DRM_DEBUG_KMS("Monitor has basic audio support\n");