/*
* 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_atomic_helper.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;
}
