linux-kernel - [PATCH v2] drm/edid: fixed the bug that hdr metadata was not cleared

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Message-ID: <20250513011145epcms5p84bf94d5c03933fd61f4abf1fadab5016@epcms5p8>
Date: Tue, 13 May 2025 09:11:45 +0800
From: Feijuan Li <feijuan.li@...sung.com>
To: "jingoohan1@...il.com" <jingoohan1@...il.com>,
	"maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>,
	"mripard@...nel.org" <mripard@...nel.org>, "tzimmermann@...e.de"
	<tzimmermann@...e.de>, "airlied@...il.com" <airlied@...il.com>,
	"simona@...ll.ch" <simona@...ll.ch>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: Hongfei Tang <hongfei.tang@...sung.com>, Minggui Yan
	<minggui.yan@...sung.com>, Qilin Wang <qilin.wang@...sung.com>
Subject: [PATCH v2] drm/edid: fixed the bug that hdr metadata was not
 cleared

Dear maintainer:

I have changed the patch as your suggestion.
v1->v2:make a new function for hdr info reset.


From: "feijuan.li" <feijuan.li@...sung.com>
Date: Fri, 18 Apr 2025 14:56:49 +0000
Subject: [PATCH v2] drm/edid: fixed the bug that hdr metadata was not reset

When DP connected to a device with HDR capability,
the hdr structure was filled.Then connected to another
sink device without hdr capability, but the hdr info
still exist.

Signed-off-by: feijuan.li <feijuan.li@...sung.com>
---
 drivers/gpu/drm/drm_edid.c 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 13bc4c290b17..cd0e4148f6b0 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -6576,6 +6576,11 @@ static void drm_update_mso(struct drm_connector *connector,
         displayid_iter_end(&iter);
 }
 
+static void drm_reset_hdr_sink_metadata(struct drm_connector *connector)
+{
+        memset(&connector->hdr_sink_metadata, 0, sizeof(connector->hdr_sink_metadata));
+}
+
 /* A connector has no EDID information, so we've got no EDID to compute quirks from. Reset
  * all of the values which would have been set from EDID
  */
@@ -6651,6 +6656,7 @@ static void update_display_info(struct drm_connector *connector,
         struct drm_display_info *info = &connector->display_info;
         const struct edid *edid;
 
+        drm_reset_hdr_sink_metadata(connector);
         drm_reset_display_info(connector);
         clear_eld(connector);
 
-- 
2.25.1