Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 149 insertions, 0 deletions

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
new file mode 100644
index 000000000..43bc709e3
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2014 Traphandler
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ */
+
+#include <linux/media-bus-format.h>
+#include <linux/of_graph.h>
+
+#include <drm/drm_bridge.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_of.h>
+#include <drm/drm_simple_kms_helper.h>
+
+#include "atmel_hlcdc_dc.h"
+
+struct atmel_hlcdc_rgb_output {
+	struct drm_encoder encoder;
+	int bus_fmt;
+};
+
+static struct atmel_hlcdc_rgb_output *
+atmel_hlcdc_encoder_to_rgb_output(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
+}
+
+int atmel_hlcdc_encoder_get_bus_fmt(struct drm_encoder *encoder)
+{
+	struct atmel_hlcdc_rgb_output *output;
+
+	output = atmel_hlcdc_encoder_to_rgb_output(encoder);
+
+	return output->bus_fmt;
+}
+
+static int atmel_hlcdc_of_bus_fmt(const struct device_node *ep)
+{
+	u32 bus_width;
+	int ret;
+
+	ret = of_property_read_u32(ep, "bus-width", &bus_width);
+	if (ret == -EINVAL)
+		return 0;
+	if (ret)
+		return ret;
+
+	switch (bus_width) {
+	case 12:
+		return MEDIA_BUS_FMT_RGB444_1X12;
+	case 16:
+		return MEDIA_BUS_FMT_RGB565_1X16;
+	case 18:
+		return MEDIA_BUS_FMT_RGB666_1X18;
+	case 24:
+		return MEDIA_BUS_FMT_RGB888_1X24;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
+{
+	struct atmel_hlcdc_rgb_output *output;
+	struct device_node *ep;
+	struct drm_panel *panel;
+	struct drm_bridge *bridge;
+	int ret;
+
+	ep = of_graph_get_endpoint_by_regs(dev->dev->of_node, 0, endpoint);
+	if (!ep)
+		return -ENODEV;
+
+	ret = drm_of_find_panel_or_bridge(dev->dev->of_node, 0, endpoint,
+					  &panel, &bridge);
+	if (ret) {
+		of_node_put(ep);
+		return ret;
+	}
+
+	output = devm_kzalloc(dev->dev, sizeof(*output), GFP_KERNEL);
+	if (!output) {
+		of_node_put(ep);
+		return -ENOMEM;
+	}
+
+	output->bus_fmt = atmel_hlcdc_of_bus_fmt(ep);
+	of_node_put(ep);
+	if (output->bus_fmt < 0) {
+		dev_err(dev->dev, "endpoint %d: invalid bus width\n", endpoint);
+		return -EINVAL;
+	}
+
+	ret = drm_simple_encoder_init(dev, &output->encoder,
+				      DRM_MODE_ENCODER_NONE);
+	if (ret)
+		return ret;
+
+	output->encoder.possible_crtcs = 0x1;
+
+	if (panel) {
+		bridge = drm_panel_bridge_add_typed(panel,
+						    DRM_MODE_CONNECTOR_Unknown);
+		if (IS_ERR(bridge))
+			return PTR_ERR(bridge);
+	}
+
+	if (bridge) {
+		ret = drm_bridge_attach(&output->encoder, bridge, NULL, 0);
+		if (!ret)
+			return 0;
+
+		if (panel)
+			drm_panel_bridge_remove(bridge);
+	}
+
+	drm_encoder_cleanup(&output->encoder);
+
+	return ret;
+}
+
+int atmel_hlcdc_create_outputs(struct drm_device *dev)
+{
+	int endpoint, ret = 0;
+	int attached = 0;
+
+	/*
+	 * Always scan the first few endpoints even if we get -ENODEV,
+	 * but keep going after that as long as we keep getting hits.
+	 */
+	for (endpoint = 0; !ret || endpoint < 4; endpoint++) {
+		ret = atmel_hlcdc_attach_endpoint(dev, endpoint);
+		if (ret == -ENODEV)
+			continue;
+		if (ret)
+			break;
+		attached++;
+	}
+
+	/* At least one device was successfully attached.*/
+	if (ret == -ENODEV && attached)
+		return 0;
+
+	return ret;
+}