/*
* Exynos DRM Parallel output support.
*
* Copyright (c) 2014 Samsung Electronics Co., Ltd
*
* Contacts: Andrzej Hajda <a.hajda@samsung.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 <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_panel.h>
#include <drm/drm_atomic_helper.h>
#include <linux/of_graph.h>
#include <linux/regulator/consumer.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
#include "exynos_drm_crtc.h"
struct exynos_dpi {
struct drm_encoder encoder;
struct device *dev;
struct device_node *panel_node;
struct drm_panel *panel;
struct drm_connector connector;
struct videomode *vm;
};
#define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e)
{
return container_of(e, struct exynos_dpi, encoder);
}
static enum drm_connector_status
exynos_dpi_detect(struct drm_connector *connector, bool force)
{
struct exynos_dpi *ctx = connector_to_dpi(connector);
if (ctx->panel && !ctx->panel->connector)
drm_panel_attach(ctx->panel, &ctx->connector);
return connector_status_connected;
}
static void exynos_dpi_connector_destroy(struct drm_connector *connector)
{
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
}
static const struct drm_connector_funcs exynos_dpi_connector_funcs = {
.dpms = drm_atomic_helper_connector_dpms,
.detect = exynos_dpi_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = exynos_dpi_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 int exynos_dpi_get_modes(struct drm_connector *connector)
{
struct exynos_dpi *ctx = connector_to_dpi(connector);
/* fimd timings gets precedence over panel modes */
if (ctx->vm) {
struct drm_display_mode *mode;
mode = drm_mode_create(connector->dev);
if (!mode) {
DRM_ERROR("failed to create a new display mode\n");
return 0;
}
drm_display_mode_from_videomode(ctx->vm, mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
return 1;
}
if (ctx->panel)
return ctx->panel->funcs->get_modes(ctx->panel);
return 0;
}
static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
.get_modes = exynos_dpi_get_modes,
};
static int exynos_dpi_create_connector(struct drm_encoder *encoder)
{
struct exynos_dpi *ctx = encoder_to_dpi(encoder);
struct drm_connector *connector = &ctx->connector;
int ret;
connector->polled = DRM_CONNECTOR_POLL_HPD;
ret = drm_connector_init(encoder->dev, connector,
&exynos_dpi_connector_funcs,
DRM_MODE_CONNECTOR_VGA);
if (ret) {
DRM_ERROR("failed to initialize connector with drm\n");
return ret;
}
drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
drm_connector_register(connector);
drm_mode_connector_attach_encoder(connector, encoder);
return 0;
}
static void exynos_dpi_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
}
static void exynos_dpi_enable(struct drm_encoder *encoder)
{
struct exynos_dpi *ctx = encoder_to_dpi(encoder);
if (ctx->panel) {
drm_panel_prepare(ctx->panel);
drm_panel_enable(ctx->panel);
}
}
static void exynos_dpi_disable(struct drm_encoder *encoder)
{
struct exynos_dpi *ctx = encoder_to_dpi(encoder);
if (ctx->panel) {
drm_panel_disable(ctx->panel);
drm_panel_unprepare(ctx->panel);
}
}
static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
.mode_set = exynos_dpi_mode_set,
.enable = exynos_dpi_enable,
.disable = exynos_dpi_disable,
};
static const struct drm_encoder_funcs exynos_dpi_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
enum {
FIMD_PORT_IN0,
FIMD_PORT_IN1,
FIMD_PORT_IN2,
FIMD_PORT_RGB,
FIMD_PORT_WRB,
};
static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
{
struct device_node *np, *ep;
ep = of_graph_get_endpoint_by_regs(dev->of_node, FIMD_PORT_RGB, 0);
if (!ep)
return NULL;
np = of_graph_get_remote_port_parent(ep);
of_node_put(ep);
return np;
}
static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
{
struct device *dev = ctx->dev;
struct device_node *dn = dev->of_node;
struct device_node *np;
ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
np = of_get_child_by_name(dn, "display-timings");
if (np) {
struct videomode *vm;
int ret;
of_node_put(np);
vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
if (!vm)
return -ENOMEM;
ret = of_get_videomode(dn, vm, 0);
if (ret < 0) {
devm_kfree(dev, vm);
return ret;
}
ctx->vm = vm;
return 0;
}
if (!ctx->panel_node)
return -EINVAL;
return 0;
}
int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
{
int ret;
ret = exynos_drm_crtc_get_pipe_from_type(dev, EXYNOS_DISPLAY_TYPE_LCD);
if (ret < 0)
return ret;
encoder->possible_crtcs = 1 << ret;
DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
drm_encoder_init(dev, encoder, &exynos_dpi_encoder_funcs,
DRM_MODE_ENCODER_TMDS, NULL);
drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
ret = exynos_dpi_create_connector(encoder);
if (ret) {
DRM_ERROR("failed to create connector ret = %d\n", ret);
drm_encoder_cleanup(encoder);
return ret;
}
return 0;
}
struct drm_encoder *exynos_dpi_probe(struct device *dev)
{
struct exynos_dpi *ctx;
int ret;
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return ERR_PTR(-ENOMEM);
ctx->dev = dev;
ret = exynos_dpi_parse_dt(ctx);
if (ret < 0) {
devm_kfree(dev, ctx);
return NULL;
}
if (ctx->panel_node) {
ctx->panel = of_drm_find_panel(ctx->panel_node);
if (!ctx->panel)
return ERR_PTR(-EPROBE_DEFER);
}
return &ctx->encoder;
}
int exynos_dpi_remove(struct drm_encoder *encoder)
{
struct exynos_dpi *ctx = encoder_to_dpi(encoder);
exynos_dpi_disable(&ctx->encoder);
if (ctx->panel)
drm_panel_detach(ctx->panel);
return 0;
}
