Release 4.17 drivers/gpu/drm/sun4i/sun4i_lvds.c
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Free Electrons
* Maxime Ripard <maxime.ripard@free-electrons.com>
*/
#include <linux/clk.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include "sun4i_crtc.h"
#include "sun4i_tcon.h"
#include "sun4i_lvds.h"
struct sun4i_lvds {
struct drm_connector connector;
struct drm_encoder encoder;
struct sun4i_tcon *tcon;
};
static inline struct sun4i_lvds *
drm_connector_to_sun4i_lvds(struct drm_connector *connector)
{
return container_of(connector, struct sun4i_lvds,
connector);
}
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static inline struct sun4i_lvds *
drm_encoder_to_sun4i_lvds(struct drm_encoder *encoder)
{
return container_of(encoder, struct sun4i_lvds,
encoder);
}
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static int sun4i_lvds_get_modes(struct drm_connector *connector)
{
struct sun4i_lvds *lvds =
drm_connector_to_sun4i_lvds(connector);
struct sun4i_tcon *tcon = lvds->tcon;
return drm_panel_get_modes(tcon->panel);
}
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static struct drm_connector_helper_funcs sun4i_lvds_con_helper_funcs = {
.get_modes = sun4i_lvds_get_modes,
};
static void
sun4i_lvds_connector_destroy(struct drm_connector *connector)
{
struct sun4i_lvds *lvds = drm_connector_to_sun4i_lvds(connector);
struct sun4i_tcon *tcon = lvds->tcon;
drm_panel_detach(tcon->panel);
drm_connector_cleanup(connector);
}
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static const struct drm_connector_funcs sun4i_lvds_con_funcs = {
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = sun4i_lvds_connector_destroy,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static void sun4i_lvds_encoder_enable(struct drm_encoder *encoder)
{
struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
struct sun4i_tcon *tcon = lvds->tcon;
DRM_DEBUG_DRIVER("Enabling LVDS output\n");
if (!IS_ERR(tcon->panel)) {
drm_panel_prepare(tcon->panel);
drm_panel_enable(tcon->panel);
}
}
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static void sun4i_lvds_encoder_disable(struct drm_encoder *encoder)
{
struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
struct sun4i_tcon *tcon = lvds->tcon;
DRM_DEBUG_DRIVER("Disabling LVDS output\n");
if (!IS_ERR(tcon->panel)) {
drm_panel_disable(tcon->panel);
drm_panel_unprepare(tcon->panel);
}
}
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static const struct drm_encoder_helper_funcs sun4i_lvds_enc_helper_funcs = {
.disable = sun4i_lvds_encoder_disable,
.enable = sun4i_lvds_encoder_enable,
};
static const struct drm_encoder_funcs sun4i_lvds_enc_funcs = {
.destroy = drm_encoder_cleanup,
};
int sun4i_lvds_init(struct drm_device *drm, struct sun4i_tcon *tcon)
{
struct drm_encoder *encoder;
struct drm_bridge *bridge;
struct sun4i_lvds *lvds;
int ret;
lvds = devm_kzalloc(drm->dev, sizeof(*lvds), GFP_KERNEL);
if (!lvds)
return -ENOMEM;
lvds->tcon = tcon;
encoder = &lvds->encoder;
ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
&tcon->panel, &bridge);
if (ret) {
dev_info(drm->dev, "No panel or bridge found... LVDS output disabled\n");
return 0;
}
drm_encoder_helper_add(&lvds->encoder,
&sun4i_lvds_enc_helper_funcs);
ret = drm_encoder_init(drm,
&lvds->encoder,
&sun4i_lvds_enc_funcs,
DRM_MODE_ENCODER_LVDS,
NULL);
if (ret) {
dev_err(drm->dev, "Couldn't initialise the lvds encoder\n");
goto err_out;
}
/* The LVDS encoder can only work with the TCON channel 0 */
lvds->encoder.possible_crtcs = BIT(drm_crtc_index(&tcon->crtc->crtc));
if (tcon->panel) {
drm_connector_helper_add(&lvds->connector,
&sun4i_lvds_con_helper_funcs);
ret = drm_connector_init(drm, &lvds->connector,
&sun4i_lvds_con_funcs,
DRM_MODE_CONNECTOR_LVDS);
if (ret) {
dev_err(drm->dev, "Couldn't initialise the lvds connector\n");
goto err_cleanup_connector;
}
drm_mode_connector_attach_encoder(&lvds->connector,
&lvds->encoder);
ret = drm_panel_attach(tcon->panel, &lvds->connector);
if (ret) {
dev_err(drm->dev, "Couldn't attach our panel\n");
goto err_cleanup_connector;
}
}
if (bridge) {
ret = drm_bridge_attach(encoder, bridge, NULL);
if (ret) {
dev_err(drm->dev, "Couldn't attach our bridge\n");
goto err_cleanup_connector;
}
}
return 0;
err_cleanup_connector:
drm_encoder_cleanup(&lvds->encoder);
err_out:
return ret;
}
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EXPORT_SYMBOL(sun4i_lvds_init);
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