[PATCH 36/60] drm/omap: hdmi4: Register a drm_bridge for EDID read

[Laurent Pinchart]

In order to integrate with a chain of drm_bridge, the internal HDMI4
encoder has to expose the EDID read operation through the drm_bridge
API. Register a bridge at initialisation time to do so.

For the time being make the next bridge in the chain optional as the
HDMI output is still based on omap_dss_device. The create_connector
argument to the bridge attach function is also ignored for the same
reason. This will be changed later when removing the related
omapdrm-specific display drivers.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 drivers/gpu/drm/omapdrm/dss/hdmi.h  |  3 ++
 drivers/gpu/drm/omapdrm/dss/hdmi4.c | 73 +++++++++++++++++++++++++++--
 2 files changed, 71 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi.h b/drivers/gpu/drm/omapdrm/dss/hdmi.h
index 7f0dc490a31d..d1e3f625eebc 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi.h
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi.h
@@ -25,6 +25,7 @@
 #include <linux/hdmi.h>
 #include <sound/omap-hdmi-audio.h>
 #include <media/cec.h>
+#include <drm/drm_bridge.h>
 
 #include "omapdss.h"
 #include "dss.h"
@@ -375,6 +376,7 @@ struct omap_hdmi {
 	bool core_enabled;
 
 	struct omap_dss_device output;
+	struct drm_bridge bridge;
 
 	struct platform_device *audio_pdev;
 	void (*audio_abort_cb)(struct device *dev);
@@ -390,5 +392,6 @@ struct omap_hdmi {
 };
 
 #define dssdev_to_hdmi(dssdev) container_of(dssdev, struct omap_hdmi, output)
+#define drm_bridge_to_hdmi(b) container_of(b, struct omap_hdmi, bridge)
 
 #endif
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
index 5d7b17b52dc0..3084a200911b 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
@@ -399,7 +399,8 @@ static void hdmi_disconnect(struct omap_dss_device *src,
 	omapdss_device_disconnect(dst, dst->next);
 }
 
-static struct edid *hdmi_read_edid_data(struct omap_hdmi *hdmi)
+static struct edid *hdmi_read_edid_data(struct omap_hdmi *hdmi,
+					struct drm_connector *connector)
 {
 	u8 *edid;
 	int r;
@@ -437,9 +438,12 @@ static struct edid *hdmi_read_edid_data(struct omap_hdmi *hdmi)
 	return NULL;
 }
 
-static struct edid *hdmi_read_edid(struct omap_dss_device *dssdev)
+static struct edid *
+hdmi_do_read_edid(struct omap_hdmi *hdmi,
+		  struct edid *(*read)(struct omap_hdmi *hdmi,
+				       struct drm_connector *connector),
+		  struct drm_connector *connector)
 {
-	struct omap_hdmi *hdmi = dssdev_to_hdmi(dssdev);
 	struct edid *edid = NULL;
 	unsigned int cec_addr;
 	bool need_enable;
@@ -461,7 +465,7 @@ static struct edid *hdmi_read_edid(struct omap_dss_device *dssdev)
 	if (r)
 		goto done;
 
-	edid = hdmi_read_edid_data(hdmi);
+	edid = read(hdmi, connector);
 
 done:
 	hdmi_runtime_put(hdmi);
@@ -483,6 +487,12 @@ static struct edid *hdmi_read_edid(struct omap_dss_device *dssdev)
 	return edid;
 }
 
+static struct edid *hdmi_read_edid(struct omap_dss_device *dssdev)
+{
+	return hdmi_do_read_edid(dssdev_to_hdmi(dssdev), hdmi_read_edid_data,
+				 NULL);
+}
+
 static void hdmi_lost_hotplug(struct omap_dss_device *dssdev)
 {
 	struct omap_hdmi *hdmi = dssdev_to_hdmi(dssdev);
@@ -526,6 +536,55 @@ static const struct omap_dss_device_ops hdmi_ops = {
 	},
 };
 
+/* -----------------------------------------------------------------------------
+ * DRM Bridge Operations
+ */
+
+static int hdmi4_bridge_attach(struct drm_bridge *bridge, bool create_connector)
+{
+	struct omap_hdmi *hdmi = drm_bridge_to_hdmi(bridge);
+
+	if (!hdmi->output.next_bridge)
+		return 0;
+
+	return drm_bridge_attach(bridge->encoder, hdmi->output.next_bridge,
+				 bridge, false);
+}
+
+static struct edid *hdmi4_bridge_read_edid(struct omap_hdmi *hdmi,
+					   struct drm_connector *connector)
+{
+	return drm_do_get_edid(connector, hdmi4_core_ddc_read, &hdmi->core);
+}
+
+static struct edid *hdmi4_bridge_get_edid(struct drm_bridge *bridge,
+					  struct drm_connector *connector)
+{
+	struct omap_hdmi *hdmi = drm_bridge_to_hdmi(bridge);
+
+	return hdmi_do_read_edid(hdmi, hdmi4_bridge_read_edid, connector);
+}
+
+static const struct drm_bridge_funcs hdmi4_bridge_funcs = {
+	.attach = hdmi4_bridge_attach,
+	.get_edid = hdmi4_bridge_get_edid,
+};
+
+static void hdmi4_bridge_init(struct omap_hdmi *hdmi)
+{
+	hdmi->bridge.funcs = &hdmi4_bridge_funcs;
+	hdmi->bridge.of_node = hdmi->pdev->dev.of_node;
+	hdmi->bridge.ops = DRM_BRIDGE_OP_EDID;
+	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
+
+	drm_bridge_add(&hdmi->bridge);
+}
+
+static void hdmi4_bridge_cleanup(struct omap_hdmi *hdmi)
+{
+	drm_bridge_remove(&hdmi->bridge);
+}
+
 /* -----------------------------------------------------------------------------
  * Audio Callbacks
  */
@@ -717,6 +776,8 @@ static int hdmi4_init_output(struct omap_hdmi *hdmi)
 	struct omap_dss_device *out = &hdmi->output;
 	int r;
 
+	hdmi4_bridge_init(hdmi);
+
 	out->dev = &hdmi->pdev->dev;
 	out->id = OMAP_DSS_OUTPUT_HDMI;
 	out->type = OMAP_DISPLAY_TYPE_HDMI;
@@ -727,7 +788,7 @@ static int hdmi4_init_output(struct omap_hdmi *hdmi)
 	out->of_port = 0;
 	out->ops_flags = OMAP_DSS_DEVICE_OP_EDID;
 
-	r = omapdss_device_init_output(out, NULL);
+	r = omapdss_device_init_output(out, &hdmi->bridge);
 	if (r < 0)
 		return r;
 
@@ -742,6 +803,8 @@ static void hdmi4_uninit_output(struct omap_hdmi *hdmi)
 
 	omapdss_device_unregister(out);
 	omapdss_device_cleanup_output(out);
+
+	hdmi4_bridge_cleanup(hdmi);
 }
 
 static int hdmi4_probe_of(struct omap_hdmi *hdmi)
-- 
Regards,

Laurent Pinchart