linux-kernel - [PATCH 3/5] drm: dw-hdmi: update CEC phys addr and EDID on HPD event

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Date:   Sun, 1 Sep 2019 16:14:40 +0000
From:   Jonas Karlman <jonas@...boo.se>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>
CC:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Sean Paul <sean@...rly.run>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Hans Verkuil <hverkuil@...all.nl>,
        Jerome Brunet <jbrunet@...libre.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jonas Karlman <jonas@...boo.se>
Subject: [PATCH 3/5] drm: dw-hdmi: update CEC phys addr and EDID on HPD event

Update CEC phys addr and EDID on HPD event, fixes lost CEC phys addr and
stale EDID when HDMI cable is unplugged/replugged or AVR is powered on/off.

Signed-off-by: Jonas Karlman <jonas@...boo.se>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 91d86ddd6624..0f07be1b5914 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2189,6 +2189,7 @@ static int dw_hdmi_connector_update_edid(struct drm_connector *connector,
 static enum drm_connector_status
 dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
 {
+	enum drm_connector_status status;
 	struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
 					     connector);
 
@@ -2198,7 +2199,14 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
 	dw_hdmi_update_phy_mask(hdmi);
 	mutex_unlock(&hdmi->mutex);
 
-	return hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data);
+	status = hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data);
+
+	if (status == connector_status_connected)
+		dw_hdmi_connector_update_edid(connector, false);
+	else
+		cec_notifier_phys_addr_invalidate(hdmi->cec_notifier);
+
+	return status;
 }
 
 static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
@@ -2438,12 +2446,6 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
 		dw_hdmi_setup_rx_sense(hdmi,
 				       phy_stat & HDMI_PHY_HPD,
 				       phy_stat & HDMI_PHY_RX_SENSE);
-
-		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0) {
-			mutex_lock(&hdmi->cec_notifier_mutex);
-			cec_notifier_phys_addr_invalidate(hdmi->cec_notifier);
-			mutex_unlock(&hdmi->cec_notifier_mutex);
-		}
 	}
 
 	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
-- 
2.17.1