[PATCH v3 5/6] drm/rockchip: vop2: add support for the rgb output block

[Michael Riesch <michael.riesch@xxxxxxxxxxxxxx>]

The Rockchip VOP2 features an internal RGB output block, which can be
attached any video port of the VOP2. Add support for this output block.

Signed-off-by: Michael Riesch <michael.riesch@xxxxxxxxxxxxxx>
---
v3:
 - fix commit messages (still assumed video port 2)
 - fix condition to make 0 a valid video port
v2:
 - move away from wrong assumption that the RGB block is always
   connected to video port 2 -> check devicetree to find RGB block

 drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 44 ++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
index 06fcdfa7b885..f38ffd0ccd9f 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
@@ -39,6 +39,7 @@
 #include "rockchip_drm_gem.h"
 #include "rockchip_drm_fb.h"
 #include "rockchip_drm_vop2.h"
+#include "rockchip_rgb.h"
 
 /*
  * VOP2 architecture
@@ -212,6 +213,9 @@ struct vop2 {
 	struct clk *hclk;
 	struct clk *aclk;
 
+	/* optional internal rgb encoder */
+	struct rockchip_rgb *rgb;
+
 	/* must be put at the end of the struct */
 	struct vop2_win win[];
 };
@@ -2393,6 +2397,25 @@ static void vop2_destroy_crtcs(struct vop2 *vop2)
 	}
 }
 
+static int vop2_find_rgb_encoder(struct vop2 *vop2)
+{
+	struct device_node *node = vop2->dev->of_node;
+	struct device_node *endpoint;
+	int i;
+
+	for (i = 0; i < vop2->data->nr_vps; i++) {
+		endpoint = of_graph_get_endpoint_by_regs(node, i,
+							 ROCKCHIP_VOP2_EP_RGB0);
+		if (!endpoint)
+			continue;
+
+		of_node_put(endpoint);
+		return i;
+	}
+
+	return -ENOENT;
+}
+
 static struct reg_field vop2_cluster_regs[VOP2_WIN_MAX_REG] = {
 	[VOP2_WIN_ENABLE] = REG_FIELD(RK3568_CLUSTER_WIN_CTRL0, 0, 0),
 	[VOP2_WIN_FORMAT] = REG_FIELD(RK3568_CLUSTER_WIN_CTRL0, 1, 5),
@@ -2698,11 +2721,29 @@ static int vop2_bind(struct device *dev, struct device *master, void *data)
 	if (ret)
 		return ret;
 
+	ret = vop2_find_rgb_encoder(vop2);
+	if (ret >= 0) {
+		vop2->rgb = rockchip_rgb_init(dev, &vop2->vps[ret].crtc,
+					      vop2->drm, ret);
+		if (IS_ERR(vop2->rgb)) {
+			if (PTR_ERR(vop2->rgb) == -EPROBE_DEFER) {
+				ret = PTR_ERR(vop2->rgb);
+				goto err_crtcs;
+			}
+			vop2->rgb = NULL;
+		}
+	}
+
 	rockchip_drm_dma_init_device(vop2->drm, vop2->dev);
 
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;
+
+err_crtcs:
+	vop2_destroy_crtcs(vop2);
+
+	return ret;
 }
 
 static void vop2_unbind(struct device *dev, struct device *master, void *data)
@@ -2711,6 +2752,9 @@ static void vop2_unbind(struct device *dev, struct device *master, void *data)
 
 	pm_runtime_disable(dev);
 
+	if (vop2->rgb)
+		rockchip_rgb_fini(vop2->rgb);
+
 	vop2_destroy_crtcs(vop2);
 }
 
-- 
2.30.2