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

[Sandor Yu]

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...@nxp.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