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