omapdrm: omapdss_hdmi_ops: add lost_hotplug op

The CEC framework needs to know when the hotplug detect signal
disappears, since that means the CEC physical address has to be
invalidated (i.e. set to f.f.f.f).

Add a lost_hotplug op that is called when the HPD signal goes away.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/displays/connector-hdmi.c

@@ -165,11 +165,15 @@ static bool hdmic_detect(struct omap_dss_device *dssdev)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 	struct omap_dss_device *in = ddata->in;
+	bool connected;
 
 	if (gpio_is_valid(ddata->hpd_gpio))
-		return gpio_get_value_cansleep(ddata->hpd_gpio);
+		connected = gpio_get_value_cansleep(ddata->hpd_gpio);
 	else
-		return in->ops.hdmi->detect(in);
+		connected = in->ops.hdmi->detect(in);
+	if (!connected && in->ops.hdmi->lost_hotplug)
+		in->ops.hdmi->lost_hotplug(in);
+	return connected;
 }
 
 static int hdmic_register_hpd_cb(struct omap_dss_device *dssdev,

drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c

@@ -159,8 +159,12 @@ static int tpd_read_edid(struct omap_dss_device *dssdev,
 static bool tpd_detect(struct omap_dss_device *dssdev)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
+	struct omap_dss_device *in = ddata->in;
+	bool connected = gpiod_get_value_cansleep(ddata->hpd_gpio);
 
-	return gpiod_get_value_cansleep(ddata->hpd_gpio);
+	if (!connected && in->ops.hdmi->lost_hotplug)
+		in->ops.hdmi->lost_hotplug(in);
+	return connected;
 }
 
 static int tpd_register_hpd_cb(struct omap_dss_device *dssdev,

drivers/gpu/drm/omapdrm/dss/hdmi4.c

@@ -401,8 +401,6 @@ static void hdmi_display_disable(struct omap_dss_device *dssdev)
 
 	DSSDBG("Enter hdmi_display_disable\n");
 
-	hdmi4_cec_set_phys_addr(&hdmi.core, CEC_PHYS_ADDR_INVALID);
-
 	mutex_lock(&hdmi.lock);
 
 	spin_lock_irqsave(&hdmi.audio_playing_lock, flags);
@@ -514,6 +512,11 @@ static int hdmi_read_edid(struct omap_dss_device *dssdev,
 	return r;
 }
 
+static void hdmi_lost_hotplug(struct omap_dss_device *dssdev)
+{
+	hdmi4_cec_set_phys_addr(&hdmi.core, CEC_PHYS_ADDR_INVALID);
+}
+
 static int hdmi_set_infoframe(struct omap_dss_device *dssdev,
 		const struct hdmi_avi_infoframe *avi)
 {
@@ -540,6 +543,7 @@ static const struct omapdss_hdmi_ops hdmi_ops = {
 	.get_timings		= hdmi_display_get_timings,
 
 	.read_edid		= hdmi_read_edid,
+	.lost_hotplug		= hdmi_lost_hotplug,
 	.set_infoframe		= hdmi_set_infoframe,
 	.set_hdmi_mode		= hdmi_set_hdmi_mode,
 };

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -395,6 +395,7 @@ struct omapdss_hdmi_ops {
 			    struct videomode *vm);
 
 	int (*read_edid)(struct omap_dss_device *dssdev, u8 *buf, int len);
+	void (*lost_hotplug)(struct omap_dss_device *dssdev);
 	bool (*detect)(struct omap_dss_device *dssdev);
 
 	int (*register_hpd_cb)(struct omap_dss_device *dssdev,