If the bridge changes the bus format, allow this to be described in
the bridge, instead of providing false information about the bus
format of the connector or panel.
Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
---
.../bindings/display/bridge/lvds-transmitter.txt | 6 ++++++
drivers/gpu/drm/bridge/lvds-encoder.c | 25 ++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
index 50220190c203..8d40a2069252 100644
--- a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
+++ b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
@@ -30,6 +30,12 @@ Required properties:
device-specific version corresponding to the device first
followed by the generic version.
+Optional properties:
+
+- interface-pix-fmt:
+ List of valid input bus formats of the encoder. Recognized bus formats
+ are listed in ../bus-format.txt
+
Required nodes:
This device has two video ports. Their connections are modeled using the OF
diff --git a/drivers/gpu/drm/bridge/lvds-encoder.c b/drivers/gpu/drm/bridge/lvds-encoder.c
index 75b0d3f6e4de..b78619b5560a 100644
--- a/drivers/gpu/drm/bridge/lvds-encoder.c
+++ b/drivers/gpu/drm/bridge/lvds-encoder.c
@@ -9,6 +9,7 @@
#include <drm/drmP.h>
#include <drm/drm_bridge.h>
+#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <linux/of_graph.h>
@@ -16,6 +17,8 @@
struct lvds_encoder {
struct drm_bridge bridge;
struct drm_bridge *panel_bridge;
+ int num_bus_formats;
+ u32 *bus_formats;
};
static int lvds_encoder_attach(struct drm_bridge *bridge)
@@ -28,8 +31,22 @@ static int lvds_encoder_attach(struct drm_bridge *bridge)
bridge);
}
+static int lvds_encoder_input_formats(struct drm_bridge *bridge,
+ const u32 **bus_formats)
+{
+ struct lvds_encoder *lvds_encoder = container_of(bridge,
+ struct lvds_encoder,
+ bridge);
+
+ if (lvds_encoder->num_bus_formats)
+ *bus_formats = lvds_encoder->bus_formats;
+
+ return lvds_encoder->num_bus_formats;
+}
+
static struct drm_bridge_funcs funcs = {
.attach = lvds_encoder_attach,
+ .input_formats = lvds_encoder_input_formats,
};
static int lvds_encoder_probe(struct platform_device *pdev)
@@ -39,6 +56,7 @@ static int lvds_encoder_probe(struct platform_device *pdev)
struct device_node *panel_node;
struct drm_panel *panel;
struct lvds_encoder *lvds_encoder;
+ int ret;
lvds_encoder = devm_kzalloc(&pdev->dev, sizeof(*lvds_encoder),
GFP_KERNEL);
@@ -79,6 +97,12 @@ static int lvds_encoder_probe(struct platform_device *pdev)
if (IS_ERR(lvds_encoder->panel_bridge))
return PTR_ERR(lvds_encoder->panel_bridge);
+ ret = drm_of_bus_formats(pdev->dev.of_node, "interface-pix-fmt",
+ &lvds_encoder->bus_formats);
+ if (ret < 0)
+ return ret;
+ lvds_encoder->num_bus_formats = ret;
+
/* The panel_bridge bridge is attached to the panel's of_node,
* but we need a bridge attached to our of_node for our user
* to look up.
@@ -96,6 +120,7 @@ static int lvds_encoder_remove(struct platform_device *pdev)
{
struct lvds_encoder *lvds_encoder = platform_get_drvdata(pdev);
+ kfree(lvds_encoder->bus_formats);
drm_bridge_remove(&lvds_encoder->bridge);
return 0;
--
2.11.0
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