1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011 Texas Instruments Incorporated - https://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 the dss manager. */ 117 dss_mgr_set_timings(output, &vm); 118 } 119 120 static void omap_encoder_disable(struct drm_encoder *encoder) 121 { 122 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 123 struct omap_dss_device *dssdev = omap_encoder->output; 124 struct drm_device *dev = encoder->dev; 125 126 dev_dbg(dev->dev, "disable(%s)\n", dssdev->name); 127 128 /* 129 * Disable the chain of external devices, starting at the one at the 130 * internal encoder's output. This is used for DSI outputs only, as 131 * dssdev->next is NULL for all other outputs. 132 */ 133 omapdss_device_disable(dssdev->next); 134 } 135 136 static void omap_encoder_enable(struct drm_encoder *encoder) 137 { 138 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 139 struct omap_dss_device *dssdev = omap_encoder->output; 140 struct drm_device *dev = encoder->dev; 141 142 dev_dbg(dev->dev, "enable(%s)\n", dssdev->name); 143 144 /* 145 * Enable the chain of external devices, starting at the one at the 146 * internal encoder's output. This is used for DSI outputs only, as 147 * dssdev->next is NULL for all other outputs. 148 */ 149 omapdss_device_enable(dssdev->next); 150 } 151 152 static int omap_encoder_atomic_check(struct drm_encoder *encoder, 153 struct drm_crtc_state *crtc_state, 154 struct drm_connector_state *conn_state) 155 { 156 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 157 enum drm_mode_status status; 158 159 status = omap_connector_mode_fixup(omap_encoder->output, 160 &crtc_state->mode, 161 &crtc_state->adjusted_mode); 162 if (status != MODE_OK) { 163 dev_err(encoder->dev->dev, "invalid timings: %d\n", status); 164 return -EINVAL; 165 } 166 167 return 0; 168 } 169 170 static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = { 171 .mode_set = omap_encoder_mode_set, 172 .disable = omap_encoder_disable, 173 .enable = omap_encoder_enable, 174 .atomic_check = omap_encoder_atomic_check, 175 }; 176 177 /* initialize encoder */ 178 struct drm_encoder *omap_encoder_init(struct drm_device *dev, 179 struct omap_dss_device *output) 180 { 181 struct drm_encoder *encoder = NULL; 182 struct omap_encoder *omap_encoder; 183 184 omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL); 185 if (!omap_encoder) 186 goto fail; 187 188 omap_encoder->output = output; 189 190 encoder = &omap_encoder->base; 191 192 drm_encoder_init(dev, encoder, &omap_encoder_funcs, 193 DRM_MODE_ENCODER_TMDS, NULL); 194 drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs); 195 196 return encoder; 197 198 fail: 199 if (encoder) 200 omap_encoder_destroy(encoder); 201 202 return NULL; 203 } 204