linux-kernel - [PATCH v2] drm: bridge: dw_hdmi: Fix ELD is not updated issue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230804061145.2824843-1-Sandor.yu@nxp.com>
Date:   Fri,  4 Aug 2023 14:11:45 +0800
From:   Sandor Yu <Sandor.yu@....com>
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     andrzej.hajda@...el.com, neil.armstrong@...aro.org,
        rfoss@...nel.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com,
        adrian.larumbe@...labora.com, treding@...dia.com,
        the.cheaterman@...il.com, l.stach@...gutronix.de,
        ville.syrjala@...ux.intel.com, cychiang@...omium.org,
        Sandor.yu@....com, shengjiu.wang@....com
Subject: [PATCH v2] drm: bridge: dw_hdmi: Fix ELD is not updated issue

The ELD (EDID-Like Data) is not updated when the HDMI cable
is plugged into different HDMI monitors.
This is because the EDID is not updated in the HDMI HPD function.
As a result, the ELD data remains unchanged and may not reflect
the capabilities of the newly connected HDMI sink device.

To address this issue, the handle_plugged_change function should move to
the bridge_atomic_enable and bridge_atomic_disable functions.
Make sure the EDID is properly updated before updating ELD.

Signed-off-by: Sandor Yu <Sandor.yu@....com>

---
v2:
  - Add the variable of last_connector_result back to driver.
    It will only be used to initialize audio codec jack status when audio codec driver probe.

---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index aa51c61a78c7..963050de42c3 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2463,15 +2463,7 @@ static enum drm_connector_status dw_hdmi_detect(struct dw_hdmi *hdmi)
 	enum drm_connector_status result;
 
 	result = hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data);
-
-	mutex_lock(&hdmi->mutex);
-	if (result != hdmi->last_connector_result) {
-		dev_dbg(hdmi->dev, "read_hpd result: %d", result);
-		handle_plugged_change(hdmi,
-				      result == connector_status_connected);
-		hdmi->last_connector_result = result;
-	}
-	mutex_unlock(&hdmi->mutex);
+	hdmi->last_connector_result = result;
 
 	return result;
 }
@@ -2971,6 +2963,7 @@ static void dw_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
 	hdmi->curr_conn = NULL;
 	dw_hdmi_update_power(hdmi);
 	dw_hdmi_update_phy_mask(hdmi);
+	handle_plugged_change(hdmi, false);
 	mutex_unlock(&hdmi->mutex);
 }
 
@@ -2989,6 +2982,7 @@ static void dw_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
 	hdmi->curr_conn = connector;
 	dw_hdmi_update_power(hdmi);
 	dw_hdmi_update_phy_mask(hdmi);
+	handle_plugged_change(hdmi, true);
 	mutex_unlock(&hdmi->mutex);
 }
 
-- 
2.34.1