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 panel itself.
Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
---
.../bindings/display/bridge/lvds-transmitter.txt | 8 ++++++++
drivers/gpu/drm/bridge/lvds-encoder.c | 18 ++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
index 9d09190d9210..c0fbe74272e7 100644
--- a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
+++ b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
@@ -29,6 +29,14 @@ Required properties:
"ti,ds90c185"
+Optional properties:
+
+- interface-pix-fmt:
+ Override the bus format of the panel, in case the bridge
+ converts the signals. Recognized formats include:
+
+ "rgb565"
+
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..acff3a5b0562 100644
--- a/drivers/gpu/drm/bridge/lvds-encoder.c
+++ b/drivers/gpu/drm/bridge/lvds-encoder.c
@@ -39,6 +39,9 @@ static int lvds_encoder_probe(struct platform_device *pdev)
struct device_node *panel_node;
struct drm_panel *panel;
struct lvds_encoder *lvds_encoder;
+ u32 bus_format = 0;
+ const char *fmt;
+ int ret;
lvds_encoder = devm_kzalloc(&pdev->dev, sizeof(*lvds_encoder),
GFP_KERNEL);
@@ -79,6 +82,21 @@ static int lvds_encoder_probe(struct platform_device *pdev)
if (IS_ERR(lvds_encoder->panel_bridge))
return PTR_ERR(lvds_encoder->panel_bridge);
+ ret = of_property_read_string(pdev->dev.of_node,
+ "interface-pix-fmt", &fmt);
+ if (!ret) {
+ if (!strcmp(fmt, "rgb565")) {
+ bus_format = MEDIA_BUS_FMT_RGB565_1X16;
+ } else {
+ dev_dbg(&pdev->dev,
+ "requested interface-pix-fmt not recognized\n");
+ return -EINVAL;
+ }
+ }
+ if (bus_format)
+ drm_panel_bridge_set_bus_format(lvds_encoder->panel_bridge,
+ bus_format);
+
/* 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.
--
2.11.0
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