Hi Maarten, [auto build test WARNING on drm/drm-next] [also build test WARNING on v4.6-rc3 next-20160412] [if your patch is applied to the wrong git tree, please drop us a note to help improving the system] url: https://github.com/0day-ci/linux/commits/Maarten-Lankhorst/drm-core-Add-drm_accurate_vblank_count-v3/20160412-223507 base: git://people.freedesktop.org/~airlied/linux.git drm-next reproduce: make htmldocs All warnings (new ones prefixed by >>): drivers/gpu/drm/i915/i915_irq.c:2663: warning: No description found for parameter 'fmt' include/drm/drm_crtc.h:364: warning: No description found for parameter 'mode_blob' include/drm/drm_crtc.h:779: warning: No description found for parameter 'name' include/drm/drm_crtc.h:1238: warning: No description found for parameter 'connector_id' include/drm/drm_crtc.h:1238: warning: No description found for parameter 'tile_blob_ptr' include/drm/drm_crtc.h:1277: warning: No description found for parameter 'rotation' include/drm/drm_crtc.h:1539: warning: No description found for parameter 'name' include/drm/drm_crtc.h:1539: warning: No description found for parameter 'mutex' include/drm/drm_crtc.h:1539: warning: No description found for parameter 'helper_private' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tile_idr' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'connector_ida' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'delayed_event' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'edid_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'dpms_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'path_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tile_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'plane_type_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'rotation_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_src_x' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_src_y' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_src_w' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_src_h' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_crtc_x' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_crtc_y' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_crtc_w' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_crtc_h' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_fb_id' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_crtc_id' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_active' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'prop_mode_id' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'dvi_i_subconnector_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'dvi_i_select_subconnector_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_subconnector_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_select_subconnector_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_mode_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_left_margin_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_right_margin_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_top_margin_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_bottom_margin_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_brightness_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_contrast_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_flicker_reduction_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_overscan_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_saturation_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'tv_hue_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'scaling_mode_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'aspect_ratio_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'dirty_info_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'suggested_x_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'suggested_y_property' include/drm/drm_crtc.h:2175: warning: No description found for parameter 'allow_fb_modifiers' drivers/gpu/drm/drm_atomic_helper.c:2924: warning: No description found for parameter 'start' drivers/gpu/drm/drm_atomic_helper.c:2924: warning: No description found for parameter 'start' drivers/gpu/drm/drm_atomic_helper.c:2924: warning: No description found for parameter 'start' drivers/gpu/drm/drm_atomic_helper.c:2924: warning: No description found for parameter 'start' include/drm/drm_dp_helper.h:749: warning: No description found for parameter 'i2c_nack_count' include/drm/drm_dp_helper.h:749: warning: No description found for parameter 'i2c_defer_count' drivers/gpu/drm/drm_dp_mst_topology.c:2356: warning: No description found for parameter 'connector' include/drm/drm_dp_mst_helper.h:92: warning: No description found for parameter 'cached_edid' include/drm/drm_dp_mst_helper.h:92: warning: No description found for parameter 'has_audio' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'max_dpcd_transaction_bytes' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'sink_count' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'total_slots' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'avail_slots' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'total_pbn' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'qlock' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'tx_msg_downq' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'tx_down_in_progress' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'payload_lock' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'proposed_vcpis' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'payloads' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'payload_mask' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'vcpi_mask' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'tx_waitq' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'work' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'tx_work' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'destroy_connector_list' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'destroy_connector_lock' include/drm/drm_dp_mst_helper.h:466: warning: No description found for parameter 'destroy_connector_work' drivers/gpu/drm/drm_dp_mst_topology.c:2356: warning: No description found for parameter 'connector' drivers/gpu/drm/drm_irq.c:176: warning: No description found for parameter 'flags' >> drivers/gpu/drm/drm_irq.c:316: warning: Excess function parameter 'tv_ret' description in 'drm_accurate_vblank_count' include/drm/drmP.h:168: warning: No description found for parameter 'fmt' include/drm/drmP.h:184: warning: No description found for parameter 'fmt' include/drm/drmP.h:202: warning: No description found for parameter 'fmt' include/drm/drmP.h:247: warning: No description found for parameter 'dev' include/drm/drmP.h:247: warning: No description found for parameter 'data' include/drm/drmP.h:247: warning: No description found for parameter 'file_priv' include/drm/drmP.h:280: warning: No description found for parameter 'ioctl' include/drm/drmP.h:280: warning: No description found for parameter '_func' include/drm/drmP.h:280: warning: No description found for parameter '_flags' include/drm/drmP.h:362: warning: cannot understand function prototype: 'struct drm_lock_data ' include/drm/drmP.h:415: warning: cannot understand function prototype: 'struct drm_driver ' include/drm/drmP.h:672: warning: cannot understand function prototype: 'struct drm_info_list ' include/drm/drmP.h:682: warning: cannot understand function prototype: 'struct drm_info_node ' include/drm/drmP.h:692: warning: cannot understand function prototype: 'struct drm_minor ' include/drm/drmP.h:740: warning: cannot understand function prototype: 'struct drm_device ' drivers/gpu/drm/i915/intel_runtime_pm.c:2275: warning: No description found for parameter 'resume' drivers/gpu/drm/i915/intel_runtime_pm.c:2275: warning: No description found for parameter 'resume' drivers/gpu/drm/i915/i915_irq.c:2663: warning: No description found for parameter 'fmt' drivers/gpu/drm/i915/i915_irq.c:2663: warning: No description found for parameter 'fmt' drivers/gpu/drm/i915/i915_irq.c:2663: warning: No description found for parameter 'fmt' drivers/gpu/drm/i915/i915_irq.c:2663: warning: No description found for parameter 'fmt' drivers/gpu/drm/i915/i915_gem.c:421: warning: No description found for parameter 'dev' drivers/gpu/drm/i915/i915_gem.c:421: warning: No description found for parameter 'data' drivers/gpu/drm/i915/i915_gem.c:421: warning: No description found for parameter 'file' drivers/gpu/drm/i915/i915_gem.c:686: warning: No description found for parameter 'dev' drivers/gpu/drm/i915/i915_gem.c:686: warning: No description found for parameter 'data' drivers/gpu/drm/i915/i915_gem.c:686: warning: No description found for parameter 'file' drivers/gpu/drm/i915/i915_gem.c:767: warning: No description found for parameter 'dev' drivers/gpu/drm/i915/i915_gem.c:767: warning: No description found for parameter 'obj' drivers/gpu/drm/i915/i915_gem.c:767: warning: No description found for parameter 'args' drivers/gpu/drm/i915/i915_gem.c:767: warning: No description found for parameter 'file' drivers/gpu/drm/i915/i915_gem.c:1029: warning: No description found for parameter 'dev' drivers/gpu/drm/i915/i915_gem.c:1029: warning: No description found for parameter 'data' drivers/gpu/drm/i915/i915_gem.c:1029: warning: No description found for parameter 'file' drivers/gpu/drm/i915/i915_gem.c:1245: warning: No description found for parameter 'rps' drivers/gpu/drm/i915/i915_gem.c:1459: warning: No description found for parameter 'req' drivers/gpu/drm/i915/i915_gem.c:1494: warning: No description found for parameter 'obj' drivers/gpu/drm/i915/i915_gem.c:1494: warning: No description found for parameter 'readonly' drivers/gpu/drm/i915/i915_gem.c:1617: warning: No description found for parameter 'dev' drivers/gpu/drm/i915/i915_gem.c:1617: warning: No description found for parameter 'data' drivers/gpu/drm/i915/i915_gem.c:1617: warning: No description found for parameter 'file' drivers/gpu/drm/i915/i915_gem.c:1680: warning: No description found for parameter 'dev' drivers/gpu/drm/i915/i915_gem.c:1680: warning: No description found for parameter 'data' drivers/gpu/drm/i915/i915_gem.c:1680: warning: No description found for parameter 'file' drivers/gpu/drm/i915/i915_gem.c:1725: warning: No description found for parameter 'dev' drivers/gpu/drm/i915/i915_gem.c:1725: warning: No description found for parameter 'data' drivers/gpu/drm/i915/i915_gem.c:1725: warning: No description found for parameter 'file' drivers/gpu/drm/i915/i915_gem.c:2013: warning: No description found for parameter 'dev' drivers/gpu/drm/i915/i915_gem.c:2013: warning: No description found for parameter 'size' drivers/gpu/drm/i915/i915_gem.c:2013: warning: No description found for parameter 'tiling_mode' drivers/gpu/drm/i915/i915_gem.c:2013: warning: No description found for parameter 'fenced' drivers/gpu/drm/i915/i915_gem.c:2013: warning: Excess function parameter 'obj' description in 'i915_gem_get_gtt_alignment' drivers/gpu/drm/i915/i915_gem.c:2911: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/i915_gem.c:3037: warning: No description found for parameter 'obj' drivers/gpu/drm/i915/i915_gem.c:3087: warning: No description found for parameter 'dev' drivers/gpu/drm/i915/i915_gem.c:3087: warning: No description found for parameter 'data' drivers/gpu/drm/i915/i915_gem.c:3087: warning: No description found for parameter 'file' drivers/gpu/drm/i915/i915_gem.c:3087: warning: Excess function parameter 'DRM_IOCTL_ARGS' description in 'i915_gem_wait_ioctl' drivers/gpu/drm/i915/i915_gem.c:3459: warning: No description found for parameter 'obj' drivers/gpu/drm/i915/i915_gem.c:3459: warning: No description found for parameter 'vm' drivers/gpu/drm/i915/i915_gem.c:3459: warning: No description found for parameter 'ggtt_view' drivers/gpu/drm/i915/i915_gem.c:3459: warning: No description found for parameter 'alignment' drivers/gpu/drm/i915/i915_gem.c:3459: warning: No description found for parameter 'flags' drivers/gpu/drm/i915/i915_gem.c:3714: warning: No description found for parameter 'obj' drivers/gpu/drm/i915/i915_gem.c:3714: warning: No description found for parameter 'write' drivers/gpu/drm/i915/i915_gem.c:3789: warning: No description found for parameter 'obj' drivers/gpu/drm/i915/i915_gem.c:3789: warning: No description found for parameter 'cache_level' drivers/gpu/drm/i915/i915_gem.c:4063: warning: No description found for parameter 'obj' drivers/gpu/drm/i915/i915_gem.c:4063: warning: No description found for parameter 'write' drivers/gpu/drm/i915/i915_cmd_parser.c:748: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/i915_cmd_parser.c:748: warning: Excess function parameter 'ring' description in 'i915_cmd_parser_init_ring' drivers/gpu/drm/i915/i915_cmd_parser.c:838: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/i915_cmd_parser.c:838: warning: Excess function parameter 'ring' description in 'i915_cmd_parser_fini_ring' drivers/gpu/drm/i915/i915_cmd_parser.c:1034: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/i915_cmd_parser.c:1034: warning: Excess function parameter 'ring' description in 'i915_needs_cmd_parser' drivers/gpu/drm/i915/i915_cmd_parser.c:1186: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/i915_cmd_parser.c:1186: warning: Excess function parameter 'ring' description in 'i915_parse_cmds' drivers/gpu/drm/i915/i915_cmd_parser.c:748: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/i915_cmd_parser.c:748: warning: Excess function parameter 'ring' description in 'i915_cmd_parser_init_ring' drivers/gpu/drm/i915/i915_cmd_parser.c:838: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/i915_cmd_parser.c:838: warning: Excess function parameter 'ring' description in 'i915_cmd_parser_fini_ring' drivers/gpu/drm/i915/i915_cmd_parser.c:1034: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/i915_cmd_parser.c:1034: warning: Excess function parameter 'ring' description in 'i915_needs_cmd_parser' drivers/gpu/drm/i915/i915_cmd_parser.c:1186: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/i915_cmd_parser.c:1186: warning: Excess function parameter 'ring' description in 'i915_parse_cmds' drivers/gpu/drm/i915/intel_lrc.c:318: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/intel_lrc.c:318: warning: Excess function parameter 'ring' description in 'intel_lr_context_descriptor_update' drivers/gpu/drm/i915/intel_lrc.c:355: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/intel_lrc.c:355: warning: Excess function parameter 'ring' description in 'intel_execlists_ctx_id' drivers/gpu/drm/i915/intel_lrc.c:547: warning: No description found for parameter 'engine' drivers/gpu/drm/i915/intel_lrc.c:547: warning: Excess function parameter 'ring' description in 'intel_lrc_irq_handler' drivers/gpu/drm/i915/intel_lrc.c:951: warning: No description found for parameter 'params' drivers/gpu/drm/i915/intel_lrc.c:951: warning: Excess function parameter 'dev' description in 'intel_execlists_submission' drivers/gpu/drm/i915/intel_lrc.c:951: warning: Excess function parameter 'file' description in 'intel_execlists_submission' drivers/gpu/drm/i915/intel_lrc.c:951: warning: Excess function parameter 'ring' description in 'intel_execlists_submission' drivers/gpu/drm/i915/intel_lrc.c:951: warning: Excess function parameter 'ctx' description in 'intel_execlists_submission' drivers/gpu/drm/i915/intel_lrc.c:951: warning: Excess function parameter 'batch_obj' description in 'intel_execlists_submission' drivers/gpu/drm/i915/intel_lrc.c:951: warning: Excess function parameter 'exec_start' description in 'intel_execlists_submission' drivers/gpu/drm/i915/intel_lrc.c:951: warning: Excess function parameter 'dispatch_flags' description in 'intel_execlists_submission' drivers/gpu/drm/i915/intel_lrc.c:1334: warning: No description found for parameter 'engine' vim +316 drivers/gpu/drm/drm_irq.c 170 * 171 * Note: caller must hold dev->vbl_lock since this reads & writes 172 * device vblank fields. 173 */ 174 static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, 175 unsigned long flags) > 176 { 177 struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; 178 u32 cur_vblank, diff; 179 bool rc; 180 struct timeval t_vblank; 181 int count = DRM_TIMESTAMP_MAXRETRIES; 182 int framedur_ns = vblank->framedur_ns; 183 184 /* 185 * Interrupts were disabled prior to this call, so deal with counter 186 * wrap if needed. 187 * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events 188 * here if the register is small or we had vblank interrupts off for 189 * a long time. 190 * 191 * We repeat the hardware vblank counter & timestamp query until 192 * we get consistent results. This to prevent races between gpu 193 * updating its hardware counter while we are retrieving the 194 * corresponding vblank timestamp. 195 */ 196 do { 197 cur_vblank = dev->driver->get_vblank_counter(dev, pipe); 198 rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags); 199 } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); 200 201 if (dev->max_vblank_count != 0) { 202 /* trust the hw counter when it's around */ 203 diff = (cur_vblank - vblank->last) & dev->max_vblank_count; 204 } else if (rc && framedur_ns) { 205 const struct timeval *t_old; 206 u64 diff_ns; 207 208 t_old = &vblanktimestamp(dev, pipe, vblank->count); 209 diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old); 210 211 /* 212 * Figure out how many vblanks we've missed based 213 * on the difference in the timestamps and the 214 * frame/field duration. 215 */ 216 diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); 217 218 if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ) 219 DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored." 220 " diff_ns = %lld, framedur_ns = %d)\n", 221 pipe, (long long) diff_ns, framedur_ns); 222 } else { 223 /* some kind of default for drivers w/o accurate vbl timestamping */ 224 diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0; 225 } 226 227 /* 228 * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset 229 * interval? If so then vblank irqs keep running and it will likely 230 * happen that the hardware vblank counter is not trustworthy as it 231 * might reset at some point in that interval and vblank timestamps 232 * are not trustworthy either in that interval. Iow. this can result 233 * in a bogus diff >> 1 which must be avoided as it would cause 234 * random large forward jumps of the software vblank counter. 235 */ 236 if (diff > 1 && (vblank->inmodeset & 0x2)) { 237 DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u" 238 " due to pre-modeset.\n", pipe, diff); 239 diff = 1; 240 } 241 242 /* 243 * FIMXE: Need to replace this hack with proper seqlocks. 244 * 245 * Restrict the bump of the software vblank counter to a safe maximum 246 * value of +1 whenever there is the possibility that concurrent readers 247 * of vblank timestamps could be active at the moment, as the current 248 * implementation of the timestamp caching and updating is not safe 249 * against concurrent readers for calls to store_vblank() with a bump 250 * of anything but +1. A bump != 1 would very likely return corrupted 251 * timestamps to userspace, because the same slot in the cache could 252 * be concurrently written by store_vblank() and read by one of those 253 * readers without the read-retry logic detecting the collision. 254 * 255 * Concurrent readers can exist when we are called from the 256 * drm_vblank_off() or drm_vblank_on() functions and other non-vblank- 257 * irq callers. However, all those calls to us are happening with the 258 * vbl_lock locked to prevent drm_vblank_get(), so the vblank refcount 259 * can't increase while we are executing. Therefore a zero refcount at 260 * this point is safe for arbitrary counter bumps if we are called 261 * outside vblank irq, a non-zero count is not 100% safe. Unfortunately 262 * we must also accept a refcount of 1, as whenever we are called from 263 * drm_vblank_get() -> drm_vblank_enable() the refcount will be 1 and 264 * we must let that one pass through in order to not lose vblank counts 265 * during vblank irq off - which would completely defeat the whole 266 * point of this routine. 267 * 268 * Whenever we are called from vblank irq, we have to assume concurrent 269 * readers exist or can show up any time during our execution, even if 270 * the refcount is currently zero, as vblank irqs are usually only 271 * enabled due to the presence of readers, and because when we are called 272 * from vblank irq we can't hold the vbl_lock to protect us from sudden 273 * bumps in vblank refcount. Therefore also restrict bumps to +1 when 274 * called from vblank irq. 275 */ 276 if ((diff > 1) && (atomic_read(&vblank->refcount) > 1 || 277 (flags & DRM_CALLED_FROM_VBLIRQ))) { 278 DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u " 279 "refcount %u, vblirq %u\n", pipe, diff, 280 atomic_read(&vblank->refcount), 281 (flags & DRM_CALLED_FROM_VBLIRQ) != 0); 282 diff = 1; 283 } 284 285 DRM_DEBUG_VBL("updating vblank count on crtc %u:" 286 " current=%u, diff=%u, hw=%u hw_last=%u\n", 287 pipe, vblank->count, diff, cur_vblank, vblank->last); 288 289 if (diff == 0) { 290 WARN_ON_ONCE(cur_vblank != vblank->last); 291 return; 292 } 293 294 /* 295 * Only reinitialize corresponding vblank timestamp if high-precision query 296 * available and didn't fail, or we were called from the vblank interrupt. 297 * Otherwise reinitialize delayed at next vblank interrupt and assign 0 298 * for now, to mark the vblanktimestamp as invalid. 299 */ 300 if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0) 301 t_vblank = (struct timeval) {0, 0}; 302 303 store_vblank(dev, pipe, diff, &t_vblank, cur_vblank); 304 } 305 306 /** 307 * drm_accurate_vblank_count - retrieve the master vblank counter 308 * @crtc: which counter to retrieve 309 * @tv_ret: last time counter was updated 310 * 311 * This function is similar to @drm_crtc_vblank_count but this 312 * function interpolates to handle a race with vblank irq's. 313 */ 314 315 u32 drm_accurate_vblank_count(struct drm_crtc *crtc) > 316 { 317 struct drm_device *dev = crtc->dev; 318 u32 vblank, pipe = drm_crtc_index(crtc); 319 unsigned long flags; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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