1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright 2015 Freescale Semiconductor, Inc.
  4 *
  5 * Freescale DCU drm device driver
  6 */
  7
  8#include <linux/backlight.h>
  9#include <linux/of_graph.h>
 10
 11#include <drm/drm_atomic_helper.h>
 12#include <drm/drm_of.h>
 13#include <drm/drm_panel.h>
 14#include <drm/drm_probe_helper.h>
 15
 16#include "fsl_dcu_drm_drv.h"
 17#include "fsl_tcon.h"
 18
 19static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
 20{
 21	drm_encoder_cleanup(encoder);
 22}
 23
 24static const struct drm_encoder_funcs encoder_funcs = {
 25	.destroy = fsl_dcu_drm_encoder_destroy,
 26};
 27
 28int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
 29			       struct drm_crtc *crtc)
 30{
 31	struct drm_encoder *encoder = &fsl_dev->encoder;
 32	int ret;
 33
 34	encoder->possible_crtcs = 1;
 35
 36	/* Use bypass mode for parallel RGB/LVDS encoder */
 37	if (fsl_dev->tcon)
 38		fsl_tcon_bypass_enable(fsl_dev->tcon);
 39
 40	ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
 41			       DRM_MODE_ENCODER_LVDS, NULL);
 42	if (ret < 0)
 43		return ret;
 44
 45	return 0;
 46}
 47
 48static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
 49{
 50	struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
 51
 52	drm_connector_unregister(connector);
 53	drm_panel_detach(fsl_con->panel);
 54	drm_connector_cleanup(connector);
 55}
 56
 57static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
 58	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 59	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 60	.destroy = fsl_dcu_drm_connector_destroy,
 61	.fill_modes = drm_helper_probe_single_connector_modes,
 62	.reset = drm_atomic_helper_connector_reset,
 63};
 64
 65static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
 66{
 67	struct fsl_dcu_drm_connector *fsl_connector;
 68
 69	fsl_connector = to_fsl_dcu_connector(connector);
 70	return drm_panel_get_modes(fsl_connector->panel);
 71}
 72
 73static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
 74					    struct drm_display_mode *mode)
 75{
 76	if (mode->hdisplay & 0xf)
 77		return MODE_ERROR;
 78
 79	return MODE_OK;
 80}
 81
 82static const struct drm_connector_helper_funcs connector_helper_funcs = {
 83	.get_modes = fsl_dcu_drm_connector_get_modes,
 84	.mode_valid = fsl_dcu_drm_connector_mode_valid,
 85};
 86
 87static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
 88				 struct drm_panel *panel)
 89{
 90	struct drm_encoder *encoder = &fsl_dev->encoder;
 91	struct drm_connector *connector = &fsl_dev->connector.base;
 92	int ret;
 93
 94	fsl_dev->connector.encoder = encoder;
 95
 96	ret = drm_connector_init(fsl_dev->drm, connector,
 97				 &fsl_dcu_drm_connector_funcs,
 98				 DRM_MODE_CONNECTOR_LVDS);
 99	if (ret < 0)
100		return ret;
101
102	drm_connector_helper_add(connector, &connector_helper_funcs);
103	ret = drm_connector_register(connector);
104	if (ret < 0)
105		goto err_cleanup;
106
107	ret = drm_connector_attach_encoder(connector, encoder);
108	if (ret < 0)
109		goto err_sysfs;
110
111	ret = drm_panel_attach(panel, connector);
112	if (ret) {
113		dev_err(fsl_dev->dev, "failed to attach panel\n");
114		goto err_sysfs;
115	}
116
117	return 0;
118
119err_sysfs:
120	drm_connector_unregister(connector);
121err_cleanup:
122	drm_connector_cleanup(connector);
123	return ret;
124}
125
126int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
127{
128	struct device_node *panel_node;
129	struct drm_panel *panel;
130	struct drm_bridge *bridge;
131	int ret;
132
133	/* This is for backward compatibility */
134	panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
135	if (panel_node) {
136		fsl_dev->connector.panel = of_drm_find_panel(panel_node);
137		of_node_put(panel_node);
138		if (IS_ERR(fsl_dev->connector.panel))
139			return PTR_ERR(fsl_dev->connector.panel);
140
141		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
142	}
143
144	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
145	if (ret)
146		return ret;
147
148	if (panel) {
149		fsl_dev->connector.panel = panel;
150		return fsl_dcu_attach_panel(fsl_dev, panel);
151	}
152
153	return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL);
154}