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_panel.h> 19 20 #include "fsl_dcu_drm_drv.h" 21 #include "fsl_tcon.h" 22 23 static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder) 24 { 25 drm_encoder_cleanup(encoder); 26 } 27 28 static const struct drm_encoder_funcs encoder_funcs = { 29 .destroy = fsl_dcu_drm_encoder_destroy, 30 }; 31 32 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev, 33 struct drm_crtc *crtc) 34 { 35 struct drm_encoder *encoder = &fsl_dev->encoder; 36 int ret; 37 38 encoder->possible_crtcs = 1; 39 40 /* Use bypass mode for parallel RGB/LVDS encoder */ 41 if (fsl_dev->tcon) 42 fsl_tcon_bypass_enable(fsl_dev->tcon); 43 44 ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs, 45 DRM_MODE_ENCODER_LVDS, NULL); 46 if (ret < 0) 47 return ret; 48 49 return 0; 50 } 51 52 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector) 53 { 54 struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector); 55 56 drm_connector_unregister(connector); 57 drm_panel_detach(fsl_con->panel); 58 drm_connector_cleanup(connector); 59 } 60 61 static enum drm_connector_status 62 fsl_dcu_drm_connector_detect(struct drm_connector *connector, bool force) 63 { 64 return connector_status_connected; 65 } 66 67 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = { 68 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 69 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 70 .destroy = fsl_dcu_drm_connector_destroy, 71 .detect = fsl_dcu_drm_connector_detect, 72 .dpms = drm_atomic_helper_connector_dpms, 73 .fill_modes = drm_helper_probe_single_connector_modes, 74 .reset = drm_atomic_helper_connector_reset, 75 }; 76 77 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector) 78 { 79 struct fsl_dcu_drm_connector *fsl_connector; 80 int (*get_modes)(struct drm_panel *panel); 81 int num_modes = 0; 82 83 fsl_connector = to_fsl_dcu_connector(connector); 84 if (fsl_connector->panel && fsl_connector->panel->funcs && 85 fsl_connector->panel->funcs->get_modes) { 86 get_modes = fsl_connector->panel->funcs->get_modes; 87 num_modes = get_modes(fsl_connector->panel); 88 } 89 90 return num_modes; 91 } 92 93 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector, 94 struct drm_display_mode *mode) 95 { 96 if (mode->hdisplay & 0xf) 97 return MODE_ERROR; 98 99 return MODE_OK; 100 } 101 102 static const struct drm_connector_helper_funcs connector_helper_funcs = { 103 .get_modes = fsl_dcu_drm_connector_get_modes, 104 .mode_valid = fsl_dcu_drm_connector_mode_valid, 105 }; 106 107 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev, 108 struct drm_panel *panel) 109 { 110 struct drm_encoder *encoder = &fsl_dev->encoder; 111 struct drm_connector *connector = &fsl_dev->connector.base; 112 struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config; 113 int ret; 114 115 fsl_dev->connector.encoder = encoder; 116 117 ret = drm_connector_init(fsl_dev->drm, connector, 118 &fsl_dcu_drm_connector_funcs, 119 DRM_MODE_CONNECTOR_LVDS); 120 if (ret < 0) 121 return ret; 122 123 drm_connector_helper_add(connector, &connector_helper_funcs); 124 ret = drm_connector_register(connector); 125 if (ret < 0) 126 goto err_cleanup; 127 128 ret = drm_mode_connector_attach_encoder(connector, encoder); 129 if (ret < 0) 130 goto err_sysfs; 131 132 drm_object_property_set_value(&connector->base, 133 mode_config->dpms_property, 134 DRM_MODE_DPMS_OFF); 135 136 ret = drm_panel_attach(panel, connector); 137 if (ret) { 138 dev_err(fsl_dev->dev, "failed to attach panel\n"); 139 goto err_sysfs; 140 } 141 142 return 0; 143 144 err_sysfs: 145 drm_connector_unregister(connector); 146 err_cleanup: 147 drm_connector_cleanup(connector); 148 return ret; 149 } 150 151 static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev, 152 const struct of_endpoint *ep) 153 { 154 struct drm_bridge *bridge; 155 struct device_node *np; 156 157 np = of_graph_get_remote_port_parent(ep->local_node); 158 159 fsl_dev->connector.panel = of_drm_find_panel(np); 160 if (fsl_dev->connector.panel) { 161 of_node_put(np); 162 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel); 163 } 164 165 bridge = of_drm_find_bridge(np); 166 of_node_put(np); 167 if (!bridge) 168 return -ENODEV; 169 170 fsl_dev->encoder.bridge = bridge; 171 bridge->encoder = &fsl_dev->encoder; 172 173 return drm_bridge_attach(fsl_dev->drm, bridge); 174 } 175 176 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev) 177 { 178 struct of_endpoint ep; 179 struct device_node *ep_node, *panel_node; 180 int ret; 181 182 /* This is for backward compatibility */ 183 panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0); 184 if (panel_node) { 185 fsl_dev->connector.panel = of_drm_find_panel(panel_node); 186 of_node_put(panel_node); 187 if (!fsl_dev->connector.panel) 188 return -EPROBE_DEFER; 189 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel); 190 } 191 192 ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL); 193 if (!ep_node) 194 return -ENODEV; 195 196 ret = of_graph_parse_endpoint(ep_node, &ep); 197 of_node_put(ep_node); 198 if (ret) 199 return -ENODEV; 200 201 return fsl_dcu_attach_endpoint(fsl_dev, &ep); 202 } 203