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

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Message-Id: <20230726014833.1647244-1-Sandor.yu@nxp.com>
Date:   Wed, 26 Jul 2023 09:48:33 +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] 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>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 9a3db5234a0e0..6fa4848591226 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -196,7 +196,6 @@ struct dw_hdmi {
 
 	hdmi_codec_plugged_cb plugged_cb;
 	struct device *codec_dev;
-	enum drm_connector_status last_connector_result;
 };
 
 #define HDMI_IH_PHY_STAT0_RX_SENSE \
@@ -235,7 +234,7 @@ int dw_hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn,
 	mutex_lock(&hdmi->mutex);
 	hdmi->plugged_cb = fn;
 	hdmi->codec_dev = codec_dev;
-	plugged = hdmi->last_connector_result == connector_status_connected;
+	plugged = hdmi->connector.status == connector_status_connected;
 	handle_plugged_change(hdmi, plugged);
 	mutex_unlock(&hdmi->mutex);
 
@@ -2446,20 +2445,7 @@ static void dw_hdmi_update_phy_mask(struct dw_hdmi *hdmi)
 
 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);
-
-	return result;
+	return hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data);
 }
 
 static struct edid *dw_hdmi_get_edid(struct dw_hdmi *hdmi,
@@ -2958,6 +2944,7 @@ 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);
 }
 
@@ -2976,6 +2963,7 @@ 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);
 }
 
@@ -3369,7 +3357,6 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
 	hdmi->rxsense = true;
 	hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);
 	hdmi->mc_clkdis = 0x7f;
-	hdmi->last_connector_result = connector_status_disconnected;
 
 	mutex_init(&hdmi->mutex);
 	mutex_init(&hdmi->audio_mutex);
-- 
2.34.1