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 14 #include <drm/drmP.h> 15 #include <drm/drm_atomic_helper.h> 16 #include <drm/drm_crtc_helper.h> 17 #include <drm/drm_panel.h> 18 19 #include "fsl_dcu_drm_drv.h" 20 21 static int 22 fsl_dcu_drm_encoder_atomic_check(struct drm_encoder *encoder, 23 struct drm_crtc_state *crtc_state, 24 struct drm_connector_state *conn_state) 25 { 26 return 0; 27 } 28 29 static void fsl_dcu_drm_encoder_disable(struct drm_encoder *encoder) 30 { 31 } 32 33 static void fsl_dcu_drm_encoder_enable(struct drm_encoder *encoder) 34 { 35 } 36 37 static const struct drm_encoder_helper_funcs encoder_helper_funcs = { 38 .atomic_check = fsl_dcu_drm_encoder_atomic_check, 39 .disable = fsl_dcu_drm_encoder_disable, 40 .enable = fsl_dcu_drm_encoder_enable, 41 }; 42 43 static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder) 44 { 45 drm_encoder_cleanup(encoder); 46 } 47 48 static const struct drm_encoder_funcs encoder_funcs = { 49 .destroy = fsl_dcu_drm_encoder_destroy, 50 }; 51 52 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev, 53 struct drm_crtc *crtc) 54 { 55 struct drm_encoder *encoder = &fsl_dev->encoder; 56 int ret; 57 58 encoder->possible_crtcs = 1; 59 ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs, 60 DRM_MODE_ENCODER_LVDS); 61 if (ret < 0) 62 return ret; 63 64 drm_encoder_helper_add(encoder, &encoder_helper_funcs); 65 66 return 0; 67 } 68 69 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector) 70 { 71 drm_connector_unregister(connector); 72 drm_connector_cleanup(connector); 73 } 74 75 static enum drm_connector_status 76 fsl_dcu_drm_connector_detect(struct drm_connector *connector, bool force) 77 { 78 return connector_status_connected; 79 } 80 81 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = { 82 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 83 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 84 .destroy = fsl_dcu_drm_connector_destroy, 85 .detect = fsl_dcu_drm_connector_detect, 86 .dpms = drm_atomic_helper_connector_dpms, 87 .fill_modes = drm_helper_probe_single_connector_modes, 88 .reset = drm_atomic_helper_connector_reset, 89 }; 90 91 static struct drm_encoder * 92 fsl_dcu_drm_connector_best_encoder(struct drm_connector *connector) 93 { 94 struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector); 95 96 return fsl_con->encoder; 97 } 98 99 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector) 100 { 101 struct fsl_dcu_drm_connector *fsl_connector; 102 int (*get_modes)(struct drm_panel *panel); 103 int num_modes = 0; 104 105 fsl_connector = to_fsl_dcu_connector(connector); 106 if (fsl_connector->panel && fsl_connector->panel->funcs && 107 fsl_connector->panel->funcs->get_modes) { 108 get_modes = fsl_connector->panel->funcs->get_modes; 109 num_modes = get_modes(fsl_connector->panel); 110 } 111 112 return num_modes; 113 } 114 115 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector, 116 struct drm_display_mode *mode) 117 { 118 if (mode->hdisplay & 0xf) 119 return MODE_ERROR; 120 121 return MODE_OK; 122 } 123 124 static const struct drm_connector_helper_funcs connector_helper_funcs = { 125 .best_encoder = fsl_dcu_drm_connector_best_encoder, 126 .get_modes = fsl_dcu_drm_connector_get_modes, 127 .mode_valid = fsl_dcu_drm_connector_mode_valid, 128 }; 129 130 int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev, 131 struct drm_encoder *encoder) 132 { 133 struct drm_connector *connector = &fsl_dev->connector.base; 134 struct drm_mode_config mode_config = fsl_dev->drm->mode_config; 135 struct device_node *panel_node; 136 int ret; 137 138 fsl_dev->connector.encoder = encoder; 139 140 ret = drm_connector_init(fsl_dev->drm, connector, 141 &fsl_dcu_drm_connector_funcs, 142 DRM_MODE_CONNECTOR_LVDS); 143 if (ret < 0) 144 return ret; 145 146 drm_connector_helper_add(connector, &connector_helper_funcs); 147 ret = drm_connector_register(connector); 148 if (ret < 0) 149 goto err_cleanup; 150 151 ret = drm_mode_connector_attach_encoder(connector, encoder); 152 if (ret < 0) 153 goto err_sysfs; 154 155 drm_object_property_set_value(&connector->base, 156 mode_config.dpms_property, 157 DRM_MODE_DPMS_OFF); 158 159 panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0); 160 if (panel_node) { 161 fsl_dev->connector.panel = of_drm_find_panel(panel_node); 162 if (!fsl_dev->connector.panel) { 163 ret = -EPROBE_DEFER; 164 goto err_sysfs; 165 } 166 of_node_put(panel_node); 167 } 168 169 ret = drm_panel_attach(fsl_dev->connector.panel, connector); 170 if (ret) { 171 dev_err(fsl_dev->dev, "failed to attach panel\n"); 172 goto err_sysfs; 173 } 174 175 return 0; 176 177 err_sysfs: 178 drm_connector_unregister(connector); 179 err_cleanup: 180 drm_connector_cleanup(connector); 181 return ret; 182 } 183