1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2015 Free Electrons 4 * Copyright (C) 2015 NextThing Co 5 * 6 * Maxime Ripard <maxime.ripard@free-electrons.com> 7 */ 8 9 #include <linux/clk-provider.h> 10 #include <linux/ioport.h> 11 #include <linux/of_address.h> 12 #include <linux/of_graph.h> 13 #include <linux/of_irq.h> 14 #include <linux/regmap.h> 15 16 #include <video/videomode.h> 17 18 #include <drm/drm_atomic.h> 19 #include <drm/drm_atomic_helper.h> 20 #include <drm/drm_crtc.h> 21 #include <drm/drm_modes.h> 22 #include <drm/drm_print.h> 23 #include <drm/drm_probe_helper.h> 24 #include <drm/drm_vblank.h> 25 26 #include "sun4i_backend.h" 27 #include "sun4i_crtc.h" 28 #include "sun4i_drv.h" 29 #include "sunxi_engine.h" 30 #include "sun4i_tcon.h" 31 32 /* 33 * While this isn't really working in the DRM theory, in practice we 34 * can only ever have one encoder per TCON since we have a mux in our 35 * TCON. 36 */ 37 static struct drm_encoder *sun4i_crtc_get_encoder(struct drm_crtc *crtc) 38 { 39 struct drm_encoder *encoder; 40 41 drm_for_each_encoder(encoder, crtc->dev) 42 if (encoder->crtc == crtc) 43 return encoder; 44 45 return NULL; 46 } 47 48 static int sun4i_crtc_atomic_check(struct drm_crtc *crtc, 49 struct drm_atomic_state *state) 50 { 51 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, 52 crtc); 53 struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc); 54 struct sunxi_engine *engine = scrtc->engine; 55 int ret = 0; 56 57 if (engine && engine->ops && engine->ops->atomic_check) 58 ret = engine->ops->atomic_check(engine, crtc_state); 59 60 return ret; 61 } 62 63 static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc, 64 struct drm_atomic_state *state) 65 { 66 struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state, 67 crtc); 68 struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc); 69 struct drm_device *dev = crtc->dev; 70 struct sunxi_engine *engine = scrtc->engine; 71 unsigned long flags; 72 73 if (crtc->state->event) { 74 WARN_ON(drm_crtc_vblank_get(crtc) != 0); 75 76 spin_lock_irqsave(&dev->event_lock, flags); 77 scrtc->event = crtc->state->event; 78 spin_unlock_irqrestore(&dev->event_lock, flags); 79 crtc->state->event = NULL; 80 } 81 82 if (engine->ops->atomic_begin) 83 engine->ops->atomic_begin(engine, old_state); 84 } 85 86 static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc, 87 struct drm_atomic_state *state) 88 { 89 struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc); 90 struct drm_pending_vblank_event *event = crtc->state->event; 91 92 DRM_DEBUG_DRIVER("Committing plane changes\n"); 93 94 sunxi_engine_commit(scrtc->engine, crtc, state); 95 96 if (event) { 97 crtc->state->event = NULL; 98 99 spin_lock_irq(&crtc->dev->event_lock); 100 if (drm_crtc_vblank_get(crtc) == 0) 101 drm_crtc_arm_vblank_event(crtc, event); 102 else 103 drm_crtc_send_vblank_event(crtc, event); 104 spin_unlock_irq(&crtc->dev->event_lock); 105 } 106 } 107 108 static void sun4i_crtc_atomic_disable(struct drm_crtc *crtc, 109 struct drm_atomic_state *state) 110 { 111 struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc); 112 struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc); 113 114 DRM_DEBUG_DRIVER("Disabling the CRTC\n"); 115 116 drm_crtc_vblank_off(crtc); 117 118 sun4i_tcon_set_status(scrtc->tcon, encoder, false); 119 120 if (crtc->state->event && !crtc->state->active) { 121 spin_lock_irq(&crtc->dev->event_lock); 122 drm_crtc_send_vblank_event(crtc, crtc->state->event); 123 spin_unlock_irq(&crtc->dev->event_lock); 124 125 crtc->state->event = NULL; 126 } 127 } 128 129 static void sun4i_crtc_atomic_enable(struct drm_crtc *crtc, 130 struct drm_atomic_state *state) 131 { 132 struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc); 133 struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc); 134 135 DRM_DEBUG_DRIVER("Enabling the CRTC\n"); 136 137 sun4i_tcon_set_status(scrtc->tcon, encoder, true); 138 139 drm_crtc_vblank_on(crtc); 140 } 141 142 static void sun4i_crtc_mode_set_nofb(struct drm_crtc *crtc) 143 { 144 struct drm_display_mode *mode = &crtc->state->adjusted_mode; 145 struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc); 146 struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc); 147 148 sun4i_tcon_mode_set(scrtc->tcon, encoder, mode); 149 sunxi_engine_mode_set(scrtc->engine, mode); 150 } 151 152 static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = { 153 .atomic_check = sun4i_crtc_atomic_check, 154 .atomic_begin = sun4i_crtc_atomic_begin, 155 .atomic_flush = sun4i_crtc_atomic_flush, 156 .atomic_enable = sun4i_crtc_atomic_enable, 157 .atomic_disable = sun4i_crtc_atomic_disable, 158 .mode_set_nofb = sun4i_crtc_mode_set_nofb, 159 }; 160 161 static int sun4i_crtc_enable_vblank(struct drm_crtc *crtc) 162 { 163 struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc); 164 165 DRM_DEBUG_DRIVER("Enabling VBLANK on crtc %p\n", crtc); 166 167 sun4i_tcon_enable_vblank(scrtc->tcon, true); 168 169 return 0; 170 } 171 172 static void sun4i_crtc_disable_vblank(struct drm_crtc *crtc) 173 { 174 struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc); 175 176 DRM_DEBUG_DRIVER("Disabling VBLANK on crtc %p\n", crtc); 177 178 sun4i_tcon_enable_vblank(scrtc->tcon, false); 179 } 180 181 static const struct drm_crtc_funcs sun4i_crtc_funcs = { 182 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 183 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 184 .destroy = drm_crtc_cleanup, 185 .page_flip = drm_atomic_helper_page_flip, 186 .reset = drm_atomic_helper_crtc_reset, 187 .set_config = drm_atomic_helper_set_config, 188 .enable_vblank = sun4i_crtc_enable_vblank, 189 .disable_vblank = sun4i_crtc_disable_vblank, 190 }; 191 192 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm, 193 struct sunxi_engine *engine, 194 struct sun4i_tcon *tcon) 195 { 196 struct sun4i_crtc *scrtc; 197 struct drm_plane **planes; 198 struct drm_plane *primary = NULL, *cursor = NULL; 199 int ret, i; 200 201 scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL); 202 if (!scrtc) 203 return ERR_PTR(-ENOMEM); 204 scrtc->engine = engine; 205 scrtc->tcon = tcon; 206 207 /* Create our layers */ 208 planes = sunxi_engine_layers_init(drm, engine); 209 if (IS_ERR(planes)) { 210 dev_err(drm->dev, "Couldn't create the planes\n"); 211 return NULL; 212 } 213 214 /* find primary and cursor planes for drm_crtc_init_with_planes */ 215 for (i = 0; planes[i]; i++) { 216 struct drm_plane *plane = planes[i]; 217 218 switch (plane->type) { 219 case DRM_PLANE_TYPE_PRIMARY: 220 primary = plane; 221 break; 222 case DRM_PLANE_TYPE_CURSOR: 223 cursor = plane; 224 break; 225 default: 226 break; 227 } 228 } 229 230 ret = drm_crtc_init_with_planes(drm, &scrtc->crtc, 231 primary, 232 cursor, 233 &sun4i_crtc_funcs, 234 NULL); 235 if (ret) { 236 dev_err(drm->dev, "Couldn't init DRM CRTC\n"); 237 return ERR_PTR(ret); 238 } 239 240 drm_crtc_helper_add(&scrtc->crtc, &sun4i_crtc_helper_funcs); 241 242 /* Set crtc.port to output port node of the tcon */ 243 scrtc->crtc.port = of_graph_get_port_by_id(scrtc->tcon->dev->of_node, 244 1); 245 246 /* Set possible_crtcs to this crtc for overlay planes */ 247 for (i = 0; planes[i]; i++) { 248 uint32_t possible_crtcs = drm_crtc_mask(&scrtc->crtc); 249 struct drm_plane *plane = planes[i]; 250 251 if (plane->type == DRM_PLANE_TYPE_OVERLAY) 252 plane->possible_crtcs = possible_crtcs; 253 } 254 255 return scrtc; 256 } 257