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/*
* 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 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, i;
ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
if (ret != MODE_OK)
return ret;
for (i = 0; i < priv->num_connectors &&
priv->connectors[i] != connector; i++)
;
BUG_ON(priv->connectors[i] != connector);
BUG_ON(!priv->connector_funcs[i]);
/* If the connector has its own mode_valid call it. */
if (!IS_ERR(priv->connector_funcs[i]) &&
priv->connector_funcs[i]->mode_valid)
return priv->connector_funcs[i]->mode_valid(connector, mode);
return MODE_OK;
}
static int tilcdc_add_external_encoder(struct drm_device *dev,
struct drm_connector *connector)
{
struct tilcdc_drm_private *priv = dev->dev_private;
struct drm_connector_helper_funcs *connector_funcs;
priv->connectors[priv->num_connectors] = connector;
priv->encoders[priv->num_encoders++] = connector->encoder;
/* 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);
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[priv->num_connectors] =
connector->helper_private;
*connector_funcs = *priv->connector_funcs[priv->num_connectors];
} else {
priv->connector_funcs[priv->num_connectors] = ERR_PTR(-ENOENT);
}
connector_funcs->mode_valid = tilcdc_external_mode_valid;
drm_connector_helper_add(connector, connector_funcs);
priv->num_connectors++;
dev_dbg(dev->dev, "External encoder '%s' connected\n",
connector->encoder->name);
return 0;
}
int tilcdc_add_external_encoders(struct drm_device *dev)
{
struct tilcdc_drm_private *priv = dev->dev_private;
struct drm_connector *connector;
int num_internal_connectors = priv->num_connectors;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
bool found = false;
int i, ret;
for (i = 0; i < num_internal_connectors; i++)
if (connector == priv->connectors[i])
found = true;
if (!found) {
ret = tilcdc_add_external_encoder(dev, connector);
if (ret)
return ret;
}
}
return 0;
}
void tilcdc_remove_external_encoders(struct drm_device *dev)
{
struct tilcdc_drm_private *priv = dev->dev_private;
int i;
/* Restore the original helper functions, if any. */
for (i = 0; i < priv->num_connectors; i++)
if (IS_ERR(priv->connector_funcs[i]))
drm_connector_helper_add(priv->connectors[i], NULL);
else if (priv->connector_funcs[i])
drm_connector_helper_add(priv->connectors[i],
priv->connector_funcs[i]);
}
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;
struct device_node *ep = NULL;
int count = 0;
/* Avoid error print by of_graph_get_next_endpoint() if there
* is no ports present.
*/
node = of_get_child_by_name(dev->of_node, "ports");
if (!node)
node = of_get_child_by_name(dev->of_node, "port");
if (!node)
return 0;
of_node_put(node);
while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
node = of_graph_get_remote_port_parent(ep);
if (!node || !of_device_is_available(node)) {
of_node_put(node);
continue;
}
dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
if (match)
drm_of_component_match_add(dev, match, dev_match_of,
node);
of_node_put(node);
count++;
}
if (count > 1) {
dev_err(dev, "Only one external encoder is supported\n");
return -EINVAL;
}
return count;
}
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