linux-kernel - [PATCH 4.19 051/338] drm/edid: check basic audio support on CEA extension block

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Message-Id: <20220414110840.349407260@linuxfoundation.org>
Date:   Thu, 14 Apr 2022 15:09:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jani Nikula <jani.nikula@...el.com>,
        Shawn C Lee <shawn.c.lee@...el.com>,
        intel-gfx <intel-gfx@...ts.freedesktop.org>,
        Cooper Chiou <cooper.chiou@...el.com>
Subject: [PATCH 4.19 051/338] drm/edid: check basic audio support on CEA extension block

From: Cooper Chiou <cooper.chiou@...el.com>

commit 5662abf6e21338be6d085d6375d3732ac6147fd2 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@...r.kernel.org
Cc: Jani Nikula <jani.nikula@...el.com>
Cc: Shawn C Lee <shawn.c.lee@...el.com>
Cc: intel-gfx <intel-gfx@...ts.freedesktop.org>
Signed-off-by: Cooper Chiou <cooper.chiou@...el.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@...el.com>
Fixes: e28ad544f462 ("drm/edid: parse CEA blocks embedded in DisplayID")
Reviewed-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220324061218.32739-1-shawn.c.lee@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/drm_edid.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4323,7 +4323,8 @@ bool drm_detect_monitor_audio(struct edi
 	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");