1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ 4 * Author: Rob Clark <rob@ti.com> 5 */ 6 7 #include <linux/list.h> 8 9 #include <drm/drm_bridge.h> 10 #include <drm/drm_crtc.h> 11 #include <drm/drm_modeset_helper_vtables.h> 12 #include <drm/drm_edid.h> 13 14 #include "omap_drv.h" 15 16 /* 17 * encoder funcs 18 */ 19 20 #define to_omap_encoder(x) container_of(x, struct omap_encoder, base) 21 22 /* The encoder and connector both map to same dssdev.. the encoder 23 * handles the 'active' parts, ie. anything the modifies the state 24 * of the hw, and the connector handles the 'read-only' parts, like 25 * detecting connection and reading edid. 26 */ 27 struct omap_encoder { 28 struct drm_encoder base; 29 struct omap_dss_device *output; 30 }; 31 32 static void omap_encoder_destroy(struct drm_encoder *encoder) 33 { 34 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 35 36 drm_encoder_cleanup(encoder); 37 kfree(omap_encoder); 38 } 39 40 static const struct drm_encoder_funcs omap_encoder_funcs = { 41 .destroy = omap_encoder_destroy, 42 }; 43 44 static void omap_encoder_update_videomode_flags(struct videomode *vm, 45 u32 bus_flags) 46 { 47 if (!(vm->flags & (DISPLAY_FLAGS_DE_LOW | 48 DISPLAY_FLAGS_DE_HIGH))) { 49 if (bus_flags & DRM_BUS_FLAG_DE_LOW) 50 vm->flags |= DISPLAY_FLAGS_DE_LOW; 51 else if (bus_flags & DRM_BUS_FLAG_DE_HIGH) 52 vm->flags |= DISPLAY_FLAGS_DE_HIGH; 53 } 54 55 if (!(vm->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE | 56 DISPLAY_FLAGS_PIXDATA_NEGEDGE))) { 57 if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE) 58 vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE; 59 else if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE) 60 vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE; 61 } 62 63 if (!(vm->flags & (DISPLAY_FLAGS_SYNC_POSEDGE | 64 DISPLAY_FLAGS_SYNC_NEGEDGE))) { 65 if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE) 66 vm->flags |= DISPLAY_FLAGS_SYNC_POSEDGE; 67 else if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE) 68 vm->flags |= DISPLAY_FLAGS_SYNC_NEGEDGE; 69 } 70 } 71 72 static void omap_encoder_mode_set(struct drm_encoder *encoder, 73 struct drm_display_mode *mode, 74 struct drm_display_mode *adjusted_mode) 75 { 76 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 77 struct omap_dss_device *output = omap_encoder->output; 78 struct omap_dss_device *dssdev; 79 struct drm_device *dev = encoder->dev; 80 struct drm_connector *connector; 81 struct drm_bridge *bridge; 82 struct videomode vm = { 0 }; 83 u32 bus_flags; 84 85 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 86 if (connector->encoder == encoder) 87 break; 88 } 89 90 drm_display_mode_to_videomode(adjusted_mode, &vm); 91 92 /* 93 * HACK: This fixes the vm flags. 94 * struct drm_display_mode does not contain the VSYNC/HSYNC/DE flags and 95 * they get lost when converting back and forth between struct 96 * drm_display_mode and struct videomode. The hack below goes and 97 * fetches the missing flags. 98 * 99 * A better solution is to use DRM's bus-flags through the whole driver. 100 */ 101 for (dssdev = output; dssdev; dssdev = dssdev->next) 102 omap_encoder_update_videomode_flags(&vm, dssdev->bus_flags); 103 104 for (bridge = output->bridge; bridge; 105 bridge = drm_bridge_get_next_bridge(bridge)) { 106 if (!bridge->timings) 107 continue; 108 109 bus_flags = bridge->timings->input_bus_flags; 110 omap_encoder_update_videomode_flags(&vm, bus_flags); 111 } 112 113 bus_flags = connector->display_info.bus_flags; 114 omap_encoder_update_videomode_flags(&vm, bus_flags); 115 116 /* Set timings for all devices in the display pipeline. */ 117 dss_mgr_set_timings(output, &vm); 118 119 for (dssdev = output; dssdev; dssdev = dssdev->next) { 120 if (dssdev->ops && dssdev->ops->set_timings) 121 dssdev->ops->set_timings(dssdev, adjusted_mode); 122 } 123 } 124 125 static void omap_encoder_disable(struct drm_encoder *encoder) 126 { 127 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 128 struct omap_dss_device *dssdev = omap_encoder->output; 129 struct drm_device *dev = encoder->dev; 130 131 dev_dbg(dev->dev, "disable(%s)\n", dssdev->name); 132 133 /* 134 * Disable the chain of external devices, starting at the one at the 135 * internal encoder's output. 136 */ 137 omapdss_device_disable(dssdev->next); 138 139 /* 140 * Disable the internal encoder. This will disable the DSS output. The 141 * DSI is treated as an exception as DSI pipelines still use the legacy 142 * flow where the pipeline output controls the encoder. 143 */ 144 if (dssdev->type != OMAP_DISPLAY_TYPE_DSI) { 145 if (dssdev->ops && dssdev->ops->disable) 146 dssdev->ops->disable(dssdev); 147 dssdev->state = OMAP_DSS_DISPLAY_DISABLED; 148 } 149 150 /* 151 * Perform the post-disable operations on the chain of external devices 152 * to complete the display pipeline disable. 153 */ 154 omapdss_device_post_disable(dssdev->next); 155 } 156 157 static void omap_encoder_enable(struct drm_encoder *encoder) 158 { 159 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 160 struct omap_dss_device *dssdev = omap_encoder->output; 161 struct drm_device *dev = encoder->dev; 162 163 dev_dbg(dev->dev, "enable(%s)\n", dssdev->name); 164 165 /* Prepare the chain of external devices for pipeline enable. */ 166 omapdss_device_pre_enable(dssdev->next); 167 168 /* 169 * Enable the internal encoder. This will enable the DSS output. The 170 * DSI is treated as an exception as DSI pipelines still use the legacy 171 * flow where the pipeline output controls the encoder. 172 */ 173 if (dssdev->type != OMAP_DISPLAY_TYPE_DSI) { 174 if (dssdev->ops && dssdev->ops->enable) 175 dssdev->ops->enable(dssdev); 176 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; 177 } 178 179 /* 180 * Enable the chain of external devices, starting at the one at the 181 * internal encoder's output. 182 */ 183 omapdss_device_enable(dssdev->next); 184 } 185 186 static int omap_encoder_atomic_check(struct drm_encoder *encoder, 187 struct drm_crtc_state *crtc_state, 188 struct drm_connector_state *conn_state) 189 { 190 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 191 enum drm_mode_status status; 192 193 status = omap_connector_mode_fixup(omap_encoder->output, 194 &crtc_state->mode, 195 &crtc_state->adjusted_mode); 196 if (status != MODE_OK) { 197 dev_err(encoder->dev->dev, "invalid timings: %d\n", status); 198 return -EINVAL; 199 } 200 201 return 0; 202 } 203 204 static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = { 205 .mode_set = omap_encoder_mode_set, 206 .disable = omap_encoder_disable, 207 .enable = omap_encoder_enable, 208 .atomic_check = omap_encoder_atomic_check, 209 }; 210 211 /* initialize encoder */ 212 struct drm_encoder *omap_encoder_init(struct drm_device *dev, 213 struct omap_dss_device *output) 214 { 215 struct drm_encoder *encoder = NULL; 216 struct omap_encoder *omap_encoder; 217 218 omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL); 219 if (!omap_encoder) 220 goto fail; 221 222 omap_encoder->output = output; 223 224 encoder = &omap_encoder->base; 225 226 drm_encoder_init(dev, encoder, &omap_encoder_funcs, 227 DRM_MODE_ENCODER_TMDS, NULL); 228 drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs); 229 230 return encoder; 231 232 fail: 233 if (encoder) 234 omap_encoder_destroy(encoder); 235 236 return NULL; 237 } 238