[PATCH 24/59] drm/kmb: Add ADV7535 bridge

[Anitha Chrisanthus]

Find ADV 7535 from the device tree and get the bridge driver and attach
it to the DRM and the MIPI encoder.

v2: check for valid encoder node

Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus at intel.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe at intel.com>
---
 drivers/gpu/drm/kmb/kmb_drv.c | 27 ++++++++++++++++++++++++++-
 drivers/gpu/drm/kmb/kmb_dsi.c | 26 +++++++++++++++++++++-----
 drivers/gpu/drm/kmb/kmb_dsi.h |  3 ++-
 3 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/kmb/kmb_drv.c b/drivers/gpu/drm/kmb/kmb_drv.c
index e5f4da1..0aa910b 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.c
+++ b/drivers/gpu/drm/kmb/kmb_drv.c
@@ -55,10 +55,12 @@ static int kmb_load(struct drm_device *drm, unsigned long flags)
 {
 	struct kmb_drm_private *dev_p = drm->dev_private;
 	struct platform_device *pdev = to_platform_device(drm->dev);
+	struct drm_bridge *bridge;
 	/*struct resource *res;*/
 	/*u32 version;*/
 	int irq_lcd, irq_mipi;
 	int ret;
+	struct device_node *encoder_node;
 
 	/* TBD - not sure if clock_get needs to be called here */
 	/*
@@ -146,7 +148,30 @@ static int kmb_load(struct drm_device *drm, unsigned long flags)
 		goto setup_fail;
 	}
 
-	kmb_dsi_init(drm);
+	/* find ADV7535 node and initialize it */
+	encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
+	if (!encoder_node) {
+		DRM_ERROR("failed to get bridge info from DT\n");
+		ret = -EPROBE_DEFER;
+		goto setup_fail;
+	}
+
+	/* Locate drm bridge from the hdmi encoder DT node */
+	bridge = of_drm_find_bridge(encoder_node);
+	if (!bridge) {
+		DRM_ERROR("failed to get bridge driver from DT\n");
+		ret = -EPROBE_DEFER;
+		goto setup_fail;
+	}
+
+	of_node_put(encoder_node);
+
+	ret = kmb_dsi_init(drm, bridge);
+	if (ret) {
+		DRM_ERROR("failed to initialize DSI\n");
+		goto setup_fail;
+	}
+
 	ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
 	if (ret < 0) {
 		DRM_ERROR("failed to install IRQ handler\n");
diff --git a/drivers/gpu/drm/kmb/kmb_dsi.c b/drivers/gpu/drm/kmb/kmb_dsi.c
index 684ddbc..01014c8 100644
--- a/drivers/gpu/drm/kmb/kmb_dsi.c
+++ b/drivers/gpu/drm/kmb/kmb_dsi.c
@@ -31,6 +31,7 @@
 #include <drm/drm_edid.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_print.h>
+#include <drm/drm_bridge.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/gpio/consumer.h>
@@ -1260,7 +1261,6 @@ static void mipi_tx_init_irqs(struct kmb_drm_private *dev_p,
 	spin_unlock_irqrestore(&dev_p->irq_lock, irqflags);
 }
 
-
 void mipi_tx_handle_irqs(struct kmb_drm_private *dev_p)
 {
 	uint32_t irq_ctrl_stat_0, hs_stat, hs_enable;
@@ -1293,7 +1293,7 @@ void mipi_tx_handle_irqs(struct kmb_drm_private *dev_p)
 
 }
 
-void kmb_dsi_init(struct drm_device *dev)
+int kmb_dsi_init(struct drm_device *dev, struct drm_bridge *bridge)
 {
 	struct kmb_dsi *kmb_dsi;
 	struct drm_encoder *encoder;
@@ -1301,21 +1301,27 @@ void kmb_dsi_init(struct drm_device *dev)
 	struct drm_connector *connector;
 	struct kmb_dsi_host *host;
 	struct kmb_drm_private *dev_p = dev->dev_private;
+	int ret = 0;
 
 	kmb_dsi = kzalloc(sizeof(*kmb_dsi), GFP_KERNEL);
-	if (!kmb_dsi)
-		return;
+	if (!kmb_dsi) {
+		DRM_ERROR("failed to allocate kmb_dsi\n");
+		return -ENOMEM;
+	}
 
 	kmb_connector = kzalloc(sizeof(*kmb_connector), GFP_KERNEL);
 	if (!kmb_connector) {
 		kfree(kmb_dsi);
-		return;
+		DRM_ERROR("failed to allocate kmb_connector\n");
+		return -ENOMEM;
 	}
 
 	kmb_dsi->attached_connector = kmb_connector;
 
 	connector = &kmb_connector->base;
 	encoder = &kmb_dsi->base;
+	encoder->possible_crtcs = 1;
+	encoder->possible_clones = 0;
 	drm_encoder_init(dev, encoder, &kmb_dsi_funcs, DRM_MODE_ENCODER_DSI,
 			 "MIPI-DSI");
 
@@ -1333,6 +1339,14 @@ void kmb_dsi_init(struct drm_device *dev)
 	connector->encoder = encoder;
 	drm_connector_attach_encoder(connector, encoder);
 
+	/* Link drm_bridge to encoder */
+	ret = drm_bridge_attach(encoder, bridge, NULL, 0);
+	if (ret) {
+		DRM_ERROR("failed to attach bridge to MIPI\n");
+		drm_encoder_cleanup(encoder);
+		return ret;
+	}
+
 	/* initialize mipi controller */
 	mipi_tx_init_cntrl(dev_p, &mipi_tx_init_cfg);
 
@@ -1341,4 +1355,6 @@ void kmb_dsi_init(struct drm_device *dev)
 
 	/* irq initialization */
 	mipi_tx_init_irqs(dev_p, &int_cfg, &mipi_tx_init_cfg.tx_ctrl_cfg);
+
+	return 0;
 }
diff --git a/drivers/gpu/drm/kmb/kmb_dsi.h b/drivers/gpu/drm/kmb/kmb_dsi.h
index 8f4e0b9..8135252 100644
--- a/drivers/gpu/drm/kmb/kmb_dsi.h
+++ b/drivers/gpu/drm/kmb/kmb_dsi.h
@@ -38,6 +38,7 @@ struct kmb_dsi {
 	struct drm_encoder base;
 	struct kmb_connector *attached_connector;
 	struct kmb_dsi_host *dsi_host;
+	struct drm_bridge *bridge;
 };
 
 struct kmb_dsi_host {
@@ -328,7 +329,7 @@ union mipi_irq_cfg {
 	} irq_cfg;
 };
 
-void kmb_dsi_init(struct drm_device *dev);
+int kmb_dsi_init(struct drm_device *dev, struct drm_bridge *bridge);
 void kmb_plane_destroy(struct drm_plane *plane);
 void mipi_tx_handle_irqs(struct kmb_drm_private *dev_p);
 
-- 
2.7.4