1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 5 6 #include <drm/drm_atomic.h> 7 #include <drm/drm_atomic_helper.h> 8 #include <drm/drm_atomic_uapi.h> 9 10 #include "i915_drv.h" 11 #include "intel_atomic.h" 12 #include "intel_crtc.h" 13 #include "intel_display_types.h" 14 #include "intel_load_detect.h" 15 16 /* VESA 640x480x72Hz mode to set on the pipe */ 17 static const struct drm_display_mode load_detect_mode = { 18 DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 31500, 640, 664, 19 704, 832, 0, 480, 489, 491, 520, 0, DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC), 20 }; 21 22 static int intel_modeset_disable_planes(struct drm_atomic_state *state, 23 struct drm_crtc *crtc) 24 { 25 struct drm_plane *plane; 26 struct drm_plane_state *plane_state; 27 int ret, i; 28 29 ret = drm_atomic_add_affected_planes(state, crtc); 30 if (ret) 31 return ret; 32 33 for_each_new_plane_in_state(state, plane, plane_state, i) { 34 if (plane_state->crtc != crtc) 35 continue; 36 37 ret = drm_atomic_set_crtc_for_plane(plane_state, NULL); 38 if (ret) 39 return ret; 40 41 drm_atomic_set_fb_for_plane(plane_state, NULL); 42 } 43 44 return 0; 45 } 46 47 struct drm_atomic_state * 48 intel_load_detect_get_pipe(struct drm_connector *connector, 49 struct drm_modeset_acquire_ctx *ctx) 50 { 51 struct intel_encoder *encoder = 52 intel_attached_encoder(to_intel_connector(connector)); 53 struct intel_crtc *possible_crtc; 54 struct intel_crtc *crtc = NULL; 55 struct drm_device *dev = encoder->base.dev; 56 struct drm_i915_private *dev_priv = to_i915(dev); 57 struct drm_mode_config *config = &dev->mode_config; 58 struct drm_atomic_state *state = NULL, *restore_state = NULL; 59 struct drm_connector_state *connector_state; 60 struct intel_crtc_state *crtc_state; 61 int ret; 62 63 drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n", 64 connector->base.id, connector->name, 65 encoder->base.base.id, encoder->base.name); 66 67 drm_WARN_ON(dev, !drm_modeset_is_locked(&config->connection_mutex)); 68 69 /* 70 * Algorithm gets a little messy: 71 * 72 * - if the connector already has an assigned crtc, use it (but make 73 * sure it's on first) 74 * 75 * - try to find the first unused crtc that can drive this connector, 76 * and use that if we find one 77 */ 78 79 /* See if we already have a CRTC for this connector */ 80 if (connector->state->crtc) { 81 crtc = to_intel_crtc(connector->state->crtc); 82 83 ret = drm_modeset_lock(&crtc->base.mutex, ctx); 84 if (ret) 85 goto fail; 86 87 /* Make sure the crtc and connector are running */ 88 goto found; 89 } 90 91 /* Find an unused one (if possible) */ 92 for_each_intel_crtc(dev, possible_crtc) { 93 if (!(encoder->base.possible_crtcs & 94 drm_crtc_mask(&possible_crtc->base))) 95 continue; 96 97 ret = drm_modeset_lock(&possible_crtc->base.mutex, ctx); 98 if (ret) 99 goto fail; 100 101 if (possible_crtc->base.state->enable) { 102 drm_modeset_unlock(&possible_crtc->base.mutex); 103 continue; 104 } 105 106 crtc = possible_crtc; 107 break; 108 } 109 110 /* 111 * If we didn't find an unused CRTC, don't use any. 112 */ 113 if (!crtc) { 114 drm_dbg_kms(&dev_priv->drm, 115 "no pipe available for load-detect\n"); 116 ret = -ENODEV; 117 goto fail; 118 } 119 120 found: 121 state = drm_atomic_state_alloc(dev); 122 restore_state = drm_atomic_state_alloc(dev); 123 if (!state || !restore_state) { 124 ret = -ENOMEM; 125 goto fail; 126 } 127 128 state->acquire_ctx = ctx; 129 to_intel_atomic_state(state)->internal = true; 130 131 restore_state->acquire_ctx = ctx; 132 to_intel_atomic_state(restore_state)->internal = true; 133 134 connector_state = drm_atomic_get_connector_state(state, connector); 135 if (IS_ERR(connector_state)) { 136 ret = PTR_ERR(connector_state); 137 goto fail; 138 } 139 140 ret = drm_atomic_set_crtc_for_connector(connector_state, &crtc->base); 141 if (ret) 142 goto fail; 143 144 crtc_state = intel_atomic_get_crtc_state(state, crtc); 145 if (IS_ERR(crtc_state)) { 146 ret = PTR_ERR(crtc_state); 147 goto fail; 148 } 149 150 crtc_state->uapi.active = true; 151 152 ret = drm_atomic_set_mode_for_crtc(&crtc_state->uapi, 153 &load_detect_mode); 154 if (ret) 155 goto fail; 156 157 ret = intel_modeset_disable_planes(state, &crtc->base); 158 if (ret) 159 goto fail; 160 161 ret = PTR_ERR_OR_ZERO(drm_atomic_get_connector_state(restore_state, connector)); 162 if (!ret) 163 ret = PTR_ERR_OR_ZERO(drm_atomic_get_crtc_state(restore_state, &crtc->base)); 164 if (!ret) 165 ret = drm_atomic_add_affected_planes(restore_state, &crtc->base); 166 if (ret) { 167 drm_dbg_kms(&dev_priv->drm, 168 "Failed to create a copy of old state to restore: %i\n", 169 ret); 170 goto fail; 171 } 172 173 ret = drm_atomic_commit(state); 174 if (ret) { 175 drm_dbg_kms(&dev_priv->drm, 176 "failed to set mode on load-detect pipe\n"); 177 goto fail; 178 } 179 180 drm_atomic_state_put(state); 181 182 /* let the connector get through one full cycle before testing */ 183 intel_crtc_wait_for_next_vblank(crtc); 184 185 return restore_state; 186 187 fail: 188 if (state) { 189 drm_atomic_state_put(state); 190 state = NULL; 191 } 192 if (restore_state) { 193 drm_atomic_state_put(restore_state); 194 restore_state = NULL; 195 } 196 197 if (ret == -EDEADLK) 198 return ERR_PTR(ret); 199 200 return NULL; 201 } 202 203 void intel_load_detect_release_pipe(struct drm_connector *connector, 204 struct drm_atomic_state *state, 205 struct drm_modeset_acquire_ctx *ctx) 206 { 207 struct intel_encoder *intel_encoder = 208 intel_attached_encoder(to_intel_connector(connector)); 209 struct drm_i915_private *i915 = to_i915(intel_encoder->base.dev); 210 struct drm_encoder *encoder = &intel_encoder->base; 211 int ret; 212 213 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n", 214 connector->base.id, connector->name, 215 encoder->base.id, encoder->name); 216 217 if (IS_ERR_OR_NULL(state)) 218 return; 219 220 ret = drm_atomic_helper_commit_duplicated_state(state, ctx); 221 if (ret) 222 drm_dbg_kms(&i915->drm, 223 "Couldn't release load detect pipe: %i\n", ret); 224 drm_atomic_state_put(state); 225 } 226