1 /* 2 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ 3 * Author: Rob Clark <rob.clark@linaro.org> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include "omap_drv.h" 19 20 struct omap_irq_wait { 21 struct list_head node; 22 wait_queue_head_t wq; 23 u32 irqmask; 24 int count; 25 }; 26 27 /* call with wait_lock and dispc runtime held */ 28 static void omap_irq_update(struct drm_device *dev) 29 { 30 struct omap_drm_private *priv = dev->dev_private; 31 struct omap_irq_wait *wait; 32 u32 irqmask = priv->irq_mask; 33 34 assert_spin_locked(&priv->wait_lock); 35 36 list_for_each_entry(wait, &priv->wait_list, node) 37 irqmask |= wait->irqmask; 38 39 DBG("irqmask=%08x", irqmask); 40 41 priv->dispc_ops->write_irqenable(priv->dispc, irqmask); 42 } 43 44 static void omap_irq_wait_handler(struct omap_irq_wait *wait) 45 { 46 wait->count--; 47 wake_up(&wait->wq); 48 } 49 50 struct omap_irq_wait * omap_irq_wait_init(struct drm_device *dev, 51 u32 irqmask, int count) 52 { 53 struct omap_drm_private *priv = dev->dev_private; 54 struct omap_irq_wait *wait = kzalloc(sizeof(*wait), GFP_KERNEL); 55 unsigned long flags; 56 57 init_waitqueue_head(&wait->wq); 58 wait->irqmask = irqmask; 59 wait->count = count; 60 61 spin_lock_irqsave(&priv->wait_lock, flags); 62 list_add(&wait->node, &priv->wait_list); 63 omap_irq_update(dev); 64 spin_unlock_irqrestore(&priv->wait_lock, flags); 65 66 return wait; 67 } 68 69 int omap_irq_wait(struct drm_device *dev, struct omap_irq_wait *wait, 70 unsigned long timeout) 71 { 72 struct omap_drm_private *priv = dev->dev_private; 73 unsigned long flags; 74 int ret; 75 76 ret = wait_event_timeout(wait->wq, (wait->count <= 0), timeout); 77 78 spin_lock_irqsave(&priv->wait_lock, flags); 79 list_del(&wait->node); 80 omap_irq_update(dev); 81 spin_unlock_irqrestore(&priv->wait_lock, flags); 82 83 kfree(wait); 84 85 return ret == 0 ? -1 : 0; 86 } 87 88 /** 89 * enable_vblank - enable vblank interrupt events 90 * @dev: DRM device 91 * @pipe: which irq to enable 92 * 93 * Enable vblank interrupts for @crtc. If the device doesn't have 94 * a hardware vblank counter, this routine should be a no-op, since 95 * interrupts will have to stay on to keep the count accurate. 96 * 97 * RETURNS 98 * Zero on success, appropriate errno if the given @crtc's vblank 99 * interrupt cannot be enabled. 100 */ 101 int omap_irq_enable_vblank(struct drm_crtc *crtc) 102 { 103 struct drm_device *dev = crtc->dev; 104 struct omap_drm_private *priv = dev->dev_private; 105 unsigned long flags; 106 enum omap_channel channel = omap_crtc_channel(crtc); 107 108 DBG("dev=%p, crtc=%u", dev, channel); 109 110 spin_lock_irqsave(&priv->wait_lock, flags); 111 priv->irq_mask |= priv->dispc_ops->mgr_get_vsync_irq(priv->dispc, 112 channel); 113 omap_irq_update(dev); 114 spin_unlock_irqrestore(&priv->wait_lock, flags); 115 116 return 0; 117 } 118 119 /** 120 * disable_vblank - disable vblank interrupt events 121 * @dev: DRM device 122 * @pipe: which irq to enable 123 * 124 * Disable vblank interrupts for @crtc. If the device doesn't have 125 * a hardware vblank counter, this routine should be a no-op, since 126 * interrupts will have to stay on to keep the count accurate. 127 */ 128 void omap_irq_disable_vblank(struct drm_crtc *crtc) 129 { 130 struct drm_device *dev = crtc->dev; 131 struct omap_drm_private *priv = dev->dev_private; 132 unsigned long flags; 133 enum omap_channel channel = omap_crtc_channel(crtc); 134 135 DBG("dev=%p, crtc=%u", dev, channel); 136 137 spin_lock_irqsave(&priv->wait_lock, flags); 138 priv->irq_mask &= ~priv->dispc_ops->mgr_get_vsync_irq(priv->dispc, 139 channel); 140 omap_irq_update(dev); 141 spin_unlock_irqrestore(&priv->wait_lock, flags); 142 } 143 144 static void omap_irq_fifo_underflow(struct omap_drm_private *priv, 145 u32 irqstatus) 146 { 147 static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, 148 DEFAULT_RATELIMIT_BURST); 149 static const struct { 150 const char *name; 151 u32 mask; 152 } sources[] = { 153 { "gfx", DISPC_IRQ_GFX_FIFO_UNDERFLOW }, 154 { "vid1", DISPC_IRQ_VID1_FIFO_UNDERFLOW }, 155 { "vid2", DISPC_IRQ_VID2_FIFO_UNDERFLOW }, 156 { "vid3", DISPC_IRQ_VID3_FIFO_UNDERFLOW }, 157 }; 158 159 const u32 mask = DISPC_IRQ_GFX_FIFO_UNDERFLOW 160 | DISPC_IRQ_VID1_FIFO_UNDERFLOW 161 | DISPC_IRQ_VID2_FIFO_UNDERFLOW 162 | DISPC_IRQ_VID3_FIFO_UNDERFLOW; 163 unsigned int i; 164 165 spin_lock(&priv->wait_lock); 166 irqstatus &= priv->irq_mask & mask; 167 spin_unlock(&priv->wait_lock); 168 169 if (!irqstatus) 170 return; 171 172 if (!__ratelimit(&_rs)) 173 return; 174 175 DRM_ERROR("FIFO underflow on "); 176 177 for (i = 0; i < ARRAY_SIZE(sources); ++i) { 178 if (sources[i].mask & irqstatus) 179 pr_cont("%s ", sources[i].name); 180 } 181 182 pr_cont("(0x%08x)\n", irqstatus); 183 } 184 185 static void omap_irq_ocp_error_handler(struct drm_device *dev, 186 u32 irqstatus) 187 { 188 if (!(irqstatus & DISPC_IRQ_OCP_ERR)) 189 return; 190 191 dev_err_ratelimited(dev->dev, "OCP error\n"); 192 } 193 194 static irqreturn_t omap_irq_handler(int irq, void *arg) 195 { 196 struct drm_device *dev = (struct drm_device *) arg; 197 struct omap_drm_private *priv = dev->dev_private; 198 struct omap_irq_wait *wait, *n; 199 unsigned long flags; 200 unsigned int id; 201 u32 irqstatus; 202 203 irqstatus = priv->dispc_ops->read_irqstatus(priv->dispc); 204 priv->dispc_ops->clear_irqstatus(priv->dispc, irqstatus); 205 priv->dispc_ops->read_irqstatus(priv->dispc); /* flush posted write */ 206 207 VERB("irqs: %08x", irqstatus); 208 209 for (id = 0; id < priv->num_crtcs; id++) { 210 struct drm_crtc *crtc = priv->crtcs[id]; 211 enum omap_channel channel = omap_crtc_channel(crtc); 212 213 if (irqstatus & priv->dispc_ops->mgr_get_vsync_irq(priv->dispc, channel)) { 214 drm_handle_vblank(dev, id); 215 omap_crtc_vblank_irq(crtc); 216 } 217 218 if (irqstatus & priv->dispc_ops->mgr_get_sync_lost_irq(priv->dispc, channel)) 219 omap_crtc_error_irq(crtc, irqstatus); 220 } 221 222 omap_irq_ocp_error_handler(dev, irqstatus); 223 omap_irq_fifo_underflow(priv, irqstatus); 224 225 spin_lock_irqsave(&priv->wait_lock, flags); 226 list_for_each_entry_safe(wait, n, &priv->wait_list, node) { 227 if (wait->irqmask & irqstatus) 228 omap_irq_wait_handler(wait); 229 } 230 spin_unlock_irqrestore(&priv->wait_lock, flags); 231 232 return IRQ_HANDLED; 233 } 234 235 static const u32 omap_underflow_irqs[] = { 236 [OMAP_DSS_GFX] = DISPC_IRQ_GFX_FIFO_UNDERFLOW, 237 [OMAP_DSS_VIDEO1] = DISPC_IRQ_VID1_FIFO_UNDERFLOW, 238 [OMAP_DSS_VIDEO2] = DISPC_IRQ_VID2_FIFO_UNDERFLOW, 239 [OMAP_DSS_VIDEO3] = DISPC_IRQ_VID3_FIFO_UNDERFLOW, 240 }; 241 242 /* 243 * We need a special version, instead of just using drm_irq_install(), 244 * because we need to register the irq via omapdss. Once omapdss and 245 * omapdrm are merged together we can assign the dispc hwmod data to 246 * ourselves and drop these and just use drm_irq_{install,uninstall}() 247 */ 248 249 int omap_drm_irq_install(struct drm_device *dev) 250 { 251 struct omap_drm_private *priv = dev->dev_private; 252 unsigned int num_mgrs = priv->dispc_ops->get_num_mgrs(priv->dispc); 253 unsigned int max_planes; 254 unsigned int i; 255 int ret; 256 257 spin_lock_init(&priv->wait_lock); 258 INIT_LIST_HEAD(&priv->wait_list); 259 260 priv->irq_mask = DISPC_IRQ_OCP_ERR; 261 262 max_planes = min(ARRAY_SIZE(priv->planes), 263 ARRAY_SIZE(omap_underflow_irqs)); 264 for (i = 0; i < max_planes; ++i) { 265 if (priv->planes[i]) 266 priv->irq_mask |= omap_underflow_irqs[i]; 267 } 268 269 for (i = 0; i < num_mgrs; ++i) 270 priv->irq_mask |= priv->dispc_ops->mgr_get_sync_lost_irq(priv->dispc, i); 271 272 priv->dispc_ops->runtime_get(priv->dispc); 273 priv->dispc_ops->clear_irqstatus(priv->dispc, 0xffffffff); 274 priv->dispc_ops->runtime_put(priv->dispc); 275 276 ret = priv->dispc_ops->request_irq(priv->dispc, omap_irq_handler, dev); 277 if (ret < 0) 278 return ret; 279 280 dev->irq_enabled = true; 281 282 return 0; 283 } 284 285 void omap_drm_irq_uninstall(struct drm_device *dev) 286 { 287 struct omap_drm_private *priv = dev->dev_private; 288 289 if (!dev->irq_enabled) 290 return; 291 292 dev->irq_enabled = false; 293 294 priv->dispc_ops->free_irq(priv->dispc, dev); 295 } 296