Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 256 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_external.c b/drivers/gpu/drm/tilcdc/tilcdc_external.c
new file mode 100644
index 000000000..b4eaf9bc8
--- /dev/null
+++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright (C) 2015 Texas Instruments
+ * Author: Jyri Sarha <jsarha@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ */
+
+#include <linux/component.h>
+#include <linux/of_graph.h>
+#include <drm/drm_of.h>
+
+#include "tilcdc_drv.h"
+#include "tilcdc_external.h"
+
+static const struct tilcdc_panel_info panel_info_tda998x = {
+		.ac_bias                = 255,
+		.ac_bias_intrpt         = 0,
+		.dma_burst_sz           = 16,
+		.bpp                    = 16,
+		.fdd                    = 0x80,
+		.tft_alt_mode           = 0,
+		.invert_pxl_clk		= 1,
+		.sync_edge              = 1,
+		.sync_ctrl              = 1,
+		.raster_order           = 0,
+};
+
+static const struct tilcdc_panel_info panel_info_default = {
+		.ac_bias                = 255,
+		.ac_bias_intrpt         = 0,
+		.dma_burst_sz           = 16,
+		.bpp                    = 16,
+		.fdd                    = 0x80,
+		.tft_alt_mode           = 0,
+		.sync_edge              = 0,
+		.sync_ctrl              = 1,
+		.raster_order           = 0,
+};
+
+static int tilcdc_external_mode_valid(struct drm_connector *connector,
+				      struct drm_display_mode *mode)
+{
+	struct tilcdc_drm_private *priv = connector->dev->dev_private;
+	int ret;
+
+	ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
+	if (ret != MODE_OK)
+		return ret;
+
+	BUG_ON(priv->external_connector != connector);
+	BUG_ON(!priv->connector_funcs);
+
+	/* If the connector has its own mode_valid call it. */
+	if (!IS_ERR(priv->connector_funcs) &&
+	    priv->connector_funcs->mode_valid)
+		return priv->connector_funcs->mode_valid(connector, mode);
+
+	return MODE_OK;
+}
+
+static int tilcdc_add_external_connector(struct drm_device *dev,
+					 struct drm_connector *connector)
+{
+	struct tilcdc_drm_private *priv = dev->dev_private;
+	struct drm_connector_helper_funcs *connector_funcs;
+
+	/* There should never be more than one connector */
+	if (WARN_ON(priv->external_connector))
+		return -EINVAL;
+
+	priv->external_connector = connector;
+	connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
+				       GFP_KERNEL);
+	if (!connector_funcs)
+		return -ENOMEM;
+
+	/* connector->helper_private contains always struct
+	 * connector_helper_funcs pointer. For tilcdc crtc to have a
+	 * say if a specific mode is Ok, we need to install our own
+	 * helper functions. In our helper functions we copy
+	 * everything else but use our own mode_valid() (above).
+	 */
+	if (connector->helper_private) {
+		priv->connector_funcs =	connector->helper_private;
+		*connector_funcs = *priv->connector_funcs;
+	} else {
+		priv->connector_funcs = ERR_PTR(-ENOENT);
+	}
+	connector_funcs->mode_valid = tilcdc_external_mode_valid;
+	drm_connector_helper_add(connector, connector_funcs);
+
+	dev_dbg(dev->dev, "External connector '%s' connected\n",
+		connector->name);
+
+	return 0;
+}
+
+static
+struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
+						    struct drm_encoder *encoder)
+{
+	struct drm_connector *connector;
+
+	list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
+		if (drm_connector_has_possible_encoder(connector, encoder))
+			return connector;
+	}
+
+	dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
+		encoder->name, encoder->base.id);
+
+	return NULL;
+}
+
+int tilcdc_add_component_encoder(struct drm_device *ddev)
+{
+	struct tilcdc_drm_private *priv = ddev->dev_private;
+	struct drm_connector *connector;
+	struct drm_encoder *encoder;
+
+	list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
+		if (encoder->possible_crtcs & (1 << priv->crtc->index))
+			break;
+
+	if (!encoder) {
+		dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
+		return -ENODEV;
+	}
+
+	connector = tilcdc_encoder_find_connector(ddev, encoder);
+
+	if (!connector)
+		return -ENODEV;
+
+	/* Only tda998x is supported at the moment. */
+	tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
+	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
+
+	return tilcdc_add_external_connector(ddev, connector);
+}
+
+void tilcdc_remove_external_device(struct drm_device *dev)
+{
+	struct tilcdc_drm_private *priv = dev->dev_private;
+
+	/* Restore the original helper functions, if any. */
+	if (IS_ERR(priv->connector_funcs))
+		drm_connector_helper_add(priv->external_connector, NULL);
+	else if (priv->connector_funcs)
+		drm_connector_helper_add(priv->external_connector,
+					 priv->connector_funcs);
+}
+
+static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
+	.destroy	= drm_encoder_cleanup,
+};
+
+static
+int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
+{
+	struct tilcdc_drm_private *priv = ddev->dev_private;
+	struct drm_connector *connector;
+	int ret;
+
+	priv->external_encoder->possible_crtcs = BIT(0);
+
+	ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
+	if (ret) {
+		dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
+		return ret;
+	}
+
+	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
+
+	connector = tilcdc_encoder_find_connector(ddev, priv->external_encoder);
+	if (!connector)
+		return -ENODEV;
+
+	ret = tilcdc_add_external_connector(ddev, connector);
+
+	return ret;
+}
+
+int tilcdc_attach_external_device(struct drm_device *ddev)
+{
+	struct tilcdc_drm_private *priv = ddev->dev_private;
+	struct drm_bridge *bridge;
+	struct drm_panel *panel;
+	int ret;
+
+	ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
+					  &panel, &bridge);
+	if (ret == -ENODEV)
+		return 0;
+	else if (ret)
+		return ret;
+
+	priv->external_encoder = devm_kzalloc(ddev->dev,
+					      sizeof(*priv->external_encoder),
+					      GFP_KERNEL);
+	if (!priv->external_encoder)
+		return -ENOMEM;
+
+	ret = drm_encoder_init(ddev, priv->external_encoder,
+			       &tilcdc_external_encoder_funcs,
+			       DRM_MODE_ENCODER_NONE, NULL);
+	if (ret) {
+		dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
+		return ret;
+	}
+
+	if (panel) {
+		bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
+						   DRM_MODE_CONNECTOR_DPI);
+		if (IS_ERR(bridge)) {
+			ret = PTR_ERR(bridge);
+			goto err_encoder_cleanup;
+		}
+	}
+
+	ret = tilcdc_attach_bridge(ddev, bridge);
+	if (ret)
+		goto err_encoder_cleanup;
+
+	return 0;
+
+err_encoder_cleanup:
+	drm_encoder_cleanup(priv->external_encoder);
+	return ret;
+}
+
+static int dev_match_of(struct device *dev, void *data)
+{
+	return dev->of_node == data;
+}
+
+int tilcdc_get_external_components(struct device *dev,
+				   struct component_match **match)
+{
+	struct device_node *node;
+
+	node = of_graph_get_remote_node(dev->of_node, 0, 0);
+
+	if (!of_device_is_compatible(node, "nxp,tda998x")) {
+		of_node_put(node);
+		return 0;
+	}
+
+	if (match)
+		drm_of_component_match_add(dev, match, dev_match_of, node);
+	of_node_put(node);
+	return 1;
+}