1/*
  2 * Copyright 2015 Freescale Semiconductor, Inc.
  3 *
  4 * Freescale DCU drm device driver
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License as published by
  8 * the Free Software Foundation; either version 2 of the License, or
  9 * (at your option) any later version.
 10 */
 11
 12#include <linux/backlight.h>
 13#include <linux/of_graph.h>
 14
 15#include <drm/drmP.h>
 16#include <drm/drm_atomic_helper.h>
 17#include <drm/drm_crtc_helper.h>
 18#include <drm/drm_of.h>
 19#include <drm/drm_panel.h>
 20
 21#include "fsl_dcu_drm_drv.h"
 22#include "fsl_tcon.h"
 23
 24static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
 25{
 26	drm_encoder_cleanup(encoder);
 27}
 28
 29static const struct drm_encoder_funcs encoder_funcs = {
 30	.destroy = fsl_dcu_drm_encoder_destroy,
 31};
 32
 33int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
 34			       struct drm_crtc *crtc)
 35{
 36	struct drm_encoder *encoder = &fsl_dev->encoder;
 37	int ret;
 38
 39	encoder->possible_crtcs = 1;
 40
 41	/* Use bypass mode for parallel RGB/LVDS encoder */
 42	if (fsl_dev->tcon)
 43		fsl_tcon_bypass_enable(fsl_dev->tcon);
 44
 45	ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
 46			       DRM_MODE_ENCODER_LVDS, NULL);
 47	if (ret < 0)
 48		return ret;
 49
 50	return 0;
 51}
 52
 53static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
 54{
 55	struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
 56
 57	drm_connector_unregister(connector);
 58	drm_panel_detach(fsl_con->panel);
 59	drm_connector_cleanup(connector);
 60}
 61
 62static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
 63	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 64	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 65	.destroy = fsl_dcu_drm_connector_destroy,
 66	.fill_modes = drm_helper_probe_single_connector_modes,
 67	.reset = drm_atomic_helper_connector_reset,
 68};
 69
 70static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
 71{
 72	struct fsl_dcu_drm_connector *fsl_connector;
 73	int (*get_modes)(struct drm_panel *panel);
 74	int num_modes = 0;
 75
 76	fsl_connector = to_fsl_dcu_connector(connector);
 77	if (fsl_connector->panel && fsl_connector->panel->funcs &&
 78	    fsl_connector->panel->funcs->get_modes) {
 79		get_modes = fsl_connector->panel->funcs->get_modes;
 80		num_modes = get_modes(fsl_connector->panel);
 81	}
 82
 83	return num_modes;
 84}
 85
 86static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
 87					    struct drm_display_mode *mode)
 88{
 89	if (mode->hdisplay & 0xf)
 90		return MODE_ERROR;
 91
 92	return MODE_OK;
 93}
 94
 95static const struct drm_connector_helper_funcs connector_helper_funcs = {
 96	.get_modes = fsl_dcu_drm_connector_get_modes,
 97	.mode_valid = fsl_dcu_drm_connector_mode_valid,
 98};
 99
100static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
101				 struct drm_panel *panel)
102{
103	struct drm_encoder *encoder = &fsl_dev->encoder;
104	struct drm_connector *connector = &fsl_dev->connector.base;
105	int ret;
106
107	fsl_dev->connector.encoder = encoder;
108
109	ret = drm_connector_init(fsl_dev->drm, connector,
110				 &fsl_dcu_drm_connector_funcs,
111				 DRM_MODE_CONNECTOR_LVDS);
112	if (ret < 0)
113		return ret;
114
115	drm_connector_helper_add(connector, &connector_helper_funcs);
116	ret = drm_connector_register(connector);
117	if (ret < 0)
118		goto err_cleanup;
119
120	ret = drm_mode_connector_attach_encoder(connector, encoder);
121	if (ret < 0)
122		goto err_sysfs;
123
124	ret = drm_panel_attach(panel, connector);
125	if (ret) {
126		dev_err(fsl_dev->dev, "failed to attach panel\n");
127		goto err_sysfs;
128	}
129
130	return 0;
131
132err_sysfs:
133	drm_connector_unregister(connector);
134err_cleanup:
135	drm_connector_cleanup(connector);
136	return ret;
137}
138
139int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
140{
141	struct device_node *panel_node;
142	struct drm_panel *panel;
143	struct drm_bridge *bridge;
144	int ret;
145
146	/* This is for backward compatibility */
147	panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
148	if (panel_node) {
149		fsl_dev->connector.panel = of_drm_find_panel(panel_node);
150		of_node_put(panel_node);
151		if (!fsl_dev->connector.panel)
152			return -EPROBE_DEFER;
153		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
154	}
155
156	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
157	if (ret)
158		return ret;
159
160	if (panel) {
161		fsl_dev->connector.panel = panel;
162		return fsl_dcu_attach_panel(fsl_dev, panel);
163	}
164
165	return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL);
166}