2015-02-10 05:13:23 -07:00
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/*
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* Copyright (C) 2015 Texas Instruments
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* Author: Jyri Sarha <jsarha@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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*/
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#include <linux/component.h>
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#include <linux/of_graph.h>
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#include "tilcdc_drv.h"
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#include "tilcdc_external.h"
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static const struct tilcdc_panel_info panel_info_tda998x = {
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.ac_bias = 255,
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.ac_bias_intrpt = 0,
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.dma_burst_sz = 16,
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.bpp = 16,
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.fdd = 0x80,
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.tft_alt_mode = 0,
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.invert_pxl_clk = 1,
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.sync_edge = 1,
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.sync_ctrl = 1,
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.raster_order = 0,
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};
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static int tilcdc_external_mode_valid(struct drm_connector *connector,
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struct drm_display_mode *mode)
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{
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struct tilcdc_drm_private *priv = connector->dev->dev_private;
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int ret, i;
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ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
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if (ret != MODE_OK)
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return ret;
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for (i = 0; i < priv->num_connectors &&
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priv->connectors[i] != connector; i++)
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;
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BUG_ON(priv->connectors[i] != connector);
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BUG_ON(!priv->connector_funcs[i]);
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/* If the connector has its own mode_valid call it. */
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if (!IS_ERR(priv->connector_funcs[i]) &&
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priv->connector_funcs[i]->mode_valid)
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return priv->connector_funcs[i]->mode_valid(connector, mode);
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return MODE_OK;
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}
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static int tilcdc_add_external_encoder(struct drm_device *dev, int *bpp,
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struct drm_connector *connector)
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{
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struct tilcdc_drm_private *priv = dev->dev_private;
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struct drm_connector_helper_funcs *connector_funcs;
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priv->connectors[priv->num_connectors] = connector;
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priv->encoders[priv->num_encoders++] = connector->encoder;
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/* Only tda998x is supported at the moment. */
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tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
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tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
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*bpp = panel_info_tda998x.bpp;
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connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
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GFP_KERNEL);
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if (!connector_funcs)
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return -ENOMEM;
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/* connector->helper_private contains always struct
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* connector_helper_funcs pointer. For tilcdc crtc to have a
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* say if a specific mode is Ok, we need to install our own
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* helper functions. In our helper functions we copy
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* everything else but use our own mode_valid() (above).
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*/
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if (connector->helper_private) {
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priv->connector_funcs[priv->num_connectors] =
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connector->helper_private;
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*connector_funcs = *priv->connector_funcs[priv->num_connectors];
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} else {
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priv->connector_funcs[priv->num_connectors] = ERR_PTR(-ENOENT);
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}
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connector_funcs->mode_valid = tilcdc_external_mode_valid;
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drm_connector_helper_add(connector, connector_funcs);
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priv->num_connectors++;
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dev_dbg(dev->dev, "External encoder '%s' connected\n",
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connector->encoder->name);
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return 0;
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}
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int tilcdc_add_external_encoders(struct drm_device *dev, int *bpp)
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{
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struct tilcdc_drm_private *priv = dev->dev_private;
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struct drm_connector *connector;
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int num_internal_connectors = priv->num_connectors;
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list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
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bool found = false;
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int i, ret;
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for (i = 0; i < num_internal_connectors; i++)
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if (connector == priv->connectors[i])
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found = true;
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if (!found) {
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ret = tilcdc_add_external_encoder(dev, bpp, connector);
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if (ret)
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return ret;
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}
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}
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return 0;
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}
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void tilcdc_remove_external_encoders(struct drm_device *dev)
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{
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struct tilcdc_drm_private *priv = dev->dev_private;
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int i;
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/* Restore the original helper functions, if any. */
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for (i = 0; i < priv->num_connectors; i++)
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if (IS_ERR(priv->connector_funcs[i]))
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drm_connector_helper_add(priv->connectors[i], NULL);
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else if (priv->connector_funcs[i])
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drm_connector_helper_add(priv->connectors[i],
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priv->connector_funcs[i]);
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}
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static int dev_match_of(struct device *dev, void *data)
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{
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return dev->of_node == data;
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}
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int tilcdc_get_external_components(struct device *dev,
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struct component_match **match)
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{
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2016-06-06 02:11:35 -06:00
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struct device_node *node;
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2015-02-10 05:13:23 -07:00
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struct device_node *ep = NULL;
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int count = 0;
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2016-06-06 02:11:35 -06:00
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/* Avoid error print by of_graph_get_next_endpoint() if there
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* is no ports present.
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*/
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node = of_get_child_by_name(dev->of_node, "ports");
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if (!node)
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node = of_get_child_by_name(dev->of_node, "port");
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if (!node)
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return 0;
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of_node_put(node);
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2015-02-10 05:13:23 -07:00
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2016-06-06 02:11:35 -06:00
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while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
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2015-02-10 05:13:23 -07:00
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node = of_graph_get_remote_port_parent(ep);
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if (!node && !of_device_is_available(node)) {
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of_node_put(node);
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continue;
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}
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dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
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if (match)
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component_match_add(dev, match, dev_match_of, node);
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of_node_put(node);
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count++;
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}
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if (count > 1) {
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dev_err(dev, "Only one external encoder is supported\n");
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return -EINVAL;
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}
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return count;
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}
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