We used to use "encoder-slave" property in PGU's
Device Tree node to refer to the encoder, but since there's
a way to find it with some code smarts we get rid of
obviously extra complication in PGU node.
Again inspired by ARM's HDLCD code.
Signed-off-by: Alexey Brodkin <abrodkin@xxxxxxxxxxxx>
Cc: Liviu Dudau <Liviu.Dudau@xxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
---
arch/arc/boot/dts/axs10x_mb.dtsi | 1 -
drivers/gpu/drm/arc/arcpgu_drv.c | 23 +++++++++++++++++------
2 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/arch/arc/boot/dts/axs10x_mb.dtsi b/arch/arc/boot/dts/axs10x_mb.dtsi
index 41cfb29b62c1..2fe030186b9d 100644
--- a/arch/arc/boot/dts/axs10x_mb.dtsi
+++ b/arch/arc/boot/dts/axs10x_mb.dtsi
@@ -287,7 +287,6 @@
pgu@17000 {
compatible = "snps,arcpgu";
reg = <0x17000 0x400>;
- encoder-slave = <&adv7511>;
clocks = <&pguclk>;
clock-names = "pxlclk";
memory-region = <&frame_buffer>;
diff --git a/drivers/gpu/drm/arc/arcpgu_drv.c b/drivers/gpu/drm/arc/arcpgu_drv.c
index 5c82f52fba80..b1b2286bda95 100644
--- a/drivers/gpu/drm/arc/arcpgu_drv.c
+++ b/drivers/gpu/drm/arc/arcpgu_drv.c
@@ -19,6 +19,7 @@
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_atomic_helper.h>
+#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>
#include "arcpgu.h"
@@ -83,7 +84,7 @@ static int arcpgu_load(struct drm_device *drm)
{
struct platform_device *pdev = to_platform_device(drm->dev);
struct arcpgu_drm_private *arcpgu;
- struct device_node *encoder_node;
+ struct device_node *encoder, *port;
struct resource *res;
int ret;
@@ -118,14 +119,24 @@ static int arcpgu_load(struct drm_device *drm)
if (arc_pgu_setup_crtc(drm) < 0)
return -ENODEV;
- /* find the encoder node and initialize it */
- encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
- if (encoder_node) {
- ret = arcpgu_drm_hdmi_init(drm, encoder_node);
- of_node_put(encoder_node);
+ /* There is only one output port inside each device, find it */
+ port = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
+
+ if (port) {
+ if (of_device_is_available(port))
+ encoder = of_graph_get_remote_port_parent(port);
+ of_node_put(port);
+ }
+
+ if (encoder && of_device_is_available(encoder)) {
+ dev_info(drm->dev, "Found encoder node %s, proceeding with it\n",
+ encoder->name);
+ ret = arcpgu_drm_hdmi_init(drm, encoder);
+ of_node_put(encoder);
if (ret < 0)
return ret;
} else {
+ dev_info(drm->dev, "No encoder node, assume simulation\n");
ret = arcpgu_drm_sim_init(drm, NULL);
if (ret < 0)
return ret;
--
2.7.4
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