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_bridge.h>
 13#include <drm/drm_of.h>
 14#include <drm/drm_panel.h>
 15#include <drm/drm_probe_helper.h>
 16#include <drm/drm_simple_kms_helper.h>
 17
 18#include "fsl_dcu_drm_drv.h"
 19#include "fsl_tcon.h"
 20
 21int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
 22			       struct drm_crtc *crtc)
 23{
 24	struct drm_encoder *encoder = &fsl_dev->encoder;
 25	int ret;
 26
 27	encoder->possible_crtcs = 1;
 28
 29	/* Use bypass mode for parallel RGB/LVDS encoder */
 30	if (fsl_dev->tcon)
 31		fsl_tcon_bypass_enable(fsl_dev->tcon);
 32
 33	ret = drm_simple_encoder_init(fsl_dev->drm, encoder,
 34				      DRM_MODE_ENCODER_LVDS);
 35	if (ret < 0)
 36		return ret;
 37
 38	return 0;
 39}
 40
 41static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
 42{
 43	drm_connector_unregister(connector);
 44	drm_connector_cleanup(connector);
 45}
 46
 47static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
 48	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 49	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 50	.destroy = fsl_dcu_drm_connector_destroy,
 51	.fill_modes = drm_helper_probe_single_connector_modes,
 52	.reset = drm_atomic_helper_connector_reset,
 53};
 54
 55static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
 56{
 57	struct fsl_dcu_drm_connector *fsl_connector;
 58
 59	fsl_connector = to_fsl_dcu_connector(connector);
 60	return drm_panel_get_modes(fsl_connector->panel, connector);
 61}
 62
 63static enum drm_mode_status
 64fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
 65				 struct drm_display_mode *mode)
 66{
 67	if (mode->hdisplay & 0xf)
 68		return MODE_ERROR;
 69
 70	return MODE_OK;
 71}
 72
 73static const struct drm_connector_helper_funcs connector_helper_funcs = {
 74	.get_modes = fsl_dcu_drm_connector_get_modes,
 75	.mode_valid = fsl_dcu_drm_connector_mode_valid,
 76};
 77
 78static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
 79				 struct drm_panel *panel)
 80{
 81	struct drm_encoder *encoder = &fsl_dev->encoder;
 82	struct drm_connector *connector = &fsl_dev->connector.base;
 83	int ret;
 84
 85	fsl_dev->connector.encoder = encoder;
 86
 87	ret = drm_connector_init(fsl_dev->drm, connector,
 88				 &fsl_dcu_drm_connector_funcs,
 89				 DRM_MODE_CONNECTOR_LVDS);
 90	if (ret < 0)
 91		return ret;
 92
 93	drm_connector_helper_add(connector, &connector_helper_funcs);
 94	ret = drm_connector_register(connector);
 95	if (ret < 0)
 96		goto err_cleanup;
 97
 98	ret = drm_connector_attach_encoder(connector, encoder);
 99	if (ret < 0)
100		goto err_sysfs;
101
102	return 0;
103
104err_sysfs:
105	drm_connector_unregister(connector);
106err_cleanup:
107	drm_connector_cleanup(connector);
108	return ret;
109}
110
111int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
112{
113	struct device_node *panel_node;
114	struct drm_panel *panel;
115	struct drm_bridge *bridge;
116	int ret;
117
118	/* This is for backward compatibility */
119	panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
120	if (panel_node) {
121		fsl_dev->connector.panel = of_drm_find_panel(panel_node);
122		of_node_put(panel_node);
123		if (IS_ERR(fsl_dev->connector.panel))
124			return PTR_ERR(fsl_dev->connector.panel);
125
126		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
127	}
128
129	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
130	if (ret)
131		return ret;
132
133	if (panel) {
134		fsl_dev->connector.panel = panel;
135		return fsl_dcu_attach_panel(fsl_dev, panel);
136	}
137
138	return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL, 0);
139}