1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HD-audio controller helpers 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/delay.h> 8 #include <linux/export.h> 9 #include <sound/core.h> 10 #include <sound/hdaudio.h> 11 #include <sound/hda_register.h> 12 #include "local.h" 13 14 /* clear CORB read pointer properly */ 15 static void azx_clear_corbrp(struct hdac_bus *bus) 16 { 17 int timeout; 18 19 for (timeout = 1000; timeout > 0; timeout--) { 20 if (snd_hdac_chip_readw(bus, CORBRP) & AZX_CORBRP_RST) 21 break; 22 udelay(1); 23 } 24 if (timeout <= 0) 25 dev_err(bus->dev, "CORB reset timeout#1, CORBRP = %d\n", 26 snd_hdac_chip_readw(bus, CORBRP)); 27 28 snd_hdac_chip_writew(bus, CORBRP, 0); 29 for (timeout = 1000; timeout > 0; timeout--) { 30 if (snd_hdac_chip_readw(bus, CORBRP) == 0) 31 break; 32 udelay(1); 33 } 34 if (timeout <= 0) 35 dev_err(bus->dev, "CORB reset timeout#2, CORBRP = %d\n", 36 snd_hdac_chip_readw(bus, CORBRP)); 37 } 38 39 /** 40 * snd_hdac_bus_init_cmd_io - set up CORB/RIRB buffers 41 * @bus: HD-audio core bus 42 */ 43 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus) 44 { 45 WARN_ON_ONCE(!bus->rb.area); 46 47 spin_lock_irq(&bus->reg_lock); 48 /* CORB set up */ 49 bus->corb.addr = bus->rb.addr; 50 bus->corb.buf = (__le32 *)bus->rb.area; 51 snd_hdac_chip_writel(bus, CORBLBASE, (u32)bus->corb.addr); 52 snd_hdac_chip_writel(bus, CORBUBASE, upper_32_bits(bus->corb.addr)); 53 54 /* set the corb size to 256 entries (ULI requires explicitly) */ 55 snd_hdac_chip_writeb(bus, CORBSIZE, 0x02); 56 /* set the corb write pointer to 0 */ 57 snd_hdac_chip_writew(bus, CORBWP, 0); 58 59 /* reset the corb hw read pointer */ 60 snd_hdac_chip_writew(bus, CORBRP, AZX_CORBRP_RST); 61 if (!bus->corbrp_self_clear) 62 azx_clear_corbrp(bus); 63 64 /* enable corb dma */ 65 snd_hdac_chip_writeb(bus, CORBCTL, AZX_CORBCTL_RUN); 66 67 /* RIRB set up */ 68 bus->rirb.addr = bus->rb.addr + 2048; 69 bus->rirb.buf = (__le32 *)(bus->rb.area + 2048); 70 bus->rirb.wp = bus->rirb.rp = 0; 71 memset(bus->rirb.cmds, 0, sizeof(bus->rirb.cmds)); 72 snd_hdac_chip_writel(bus, RIRBLBASE, (u32)bus->rirb.addr); 73 snd_hdac_chip_writel(bus, RIRBUBASE, upper_32_bits(bus->rirb.addr)); 74 75 /* set the rirb size to 256 entries (ULI requires explicitly) */ 76 snd_hdac_chip_writeb(bus, RIRBSIZE, 0x02); 77 /* reset the rirb hw write pointer */ 78 snd_hdac_chip_writew(bus, RIRBWP, AZX_RIRBWP_RST); 79 /* set N=1, get RIRB response interrupt for new entry */ 80 snd_hdac_chip_writew(bus, RINTCNT, 1); 81 /* enable rirb dma and response irq */ 82 if (bus->not_use_interrupts) 83 snd_hdac_chip_writeb(bus, RIRBCTL, AZX_RBCTL_DMA_EN); 84 else 85 snd_hdac_chip_writeb(bus, RIRBCTL, AZX_RBCTL_DMA_EN | AZX_RBCTL_IRQ_EN); 86 /* Accept unsolicited responses */ 87 snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, AZX_GCTL_UNSOL); 88 spin_unlock_irq(&bus->reg_lock); 89 } 90 EXPORT_SYMBOL_GPL(snd_hdac_bus_init_cmd_io); 91 92 /* wait for cmd dmas till they are stopped */ 93 static void hdac_wait_for_cmd_dmas(struct hdac_bus *bus) 94 { 95 unsigned long timeout; 96 97 timeout = jiffies + msecs_to_jiffies(100); 98 while ((snd_hdac_chip_readb(bus, RIRBCTL) & AZX_RBCTL_DMA_EN) 99 && time_before(jiffies, timeout)) 100 udelay(10); 101 102 timeout = jiffies + msecs_to_jiffies(100); 103 while ((snd_hdac_chip_readb(bus, CORBCTL) & AZX_CORBCTL_RUN) 104 && time_before(jiffies, timeout)) 105 udelay(10); 106 } 107 108 /** 109 * snd_hdac_bus_stop_cmd_io - clean up CORB/RIRB buffers 110 * @bus: HD-audio core bus 111 */ 112 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus) 113 { 114 spin_lock_irq(&bus->reg_lock); 115 /* disable ringbuffer DMAs */ 116 snd_hdac_chip_writeb(bus, RIRBCTL, 0); 117 snd_hdac_chip_writeb(bus, CORBCTL, 0); 118 spin_unlock_irq(&bus->reg_lock); 119 120 hdac_wait_for_cmd_dmas(bus); 121 122 spin_lock_irq(&bus->reg_lock); 123 /* disable unsolicited responses */ 124 snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, 0); 125 spin_unlock_irq(&bus->reg_lock); 126 } 127 EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_cmd_io); 128 129 static unsigned int azx_command_addr(u32 cmd) 130 { 131 unsigned int addr = cmd >> 28; 132 133 if (snd_BUG_ON(addr >= HDA_MAX_CODECS)) 134 addr = 0; 135 return addr; 136 } 137 138 /** 139 * snd_hdac_bus_send_cmd - send a command verb via CORB 140 * @bus: HD-audio core bus 141 * @val: encoded verb value to send 142 * 143 * Returns zero for success or a negative error code. 144 */ 145 int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val) 146 { 147 unsigned int addr = azx_command_addr(val); 148 unsigned int wp, rp; 149 150 spin_lock_irq(&bus->reg_lock); 151 152 bus->last_cmd[azx_command_addr(val)] = val; 153 154 /* add command to corb */ 155 wp = snd_hdac_chip_readw(bus, CORBWP); 156 if (wp == 0xffff) { 157 /* something wrong, controller likely turned to D3 */ 158 spin_unlock_irq(&bus->reg_lock); 159 return -EIO; 160 } 161 wp++; 162 wp %= AZX_MAX_CORB_ENTRIES; 163 164 rp = snd_hdac_chip_readw(bus, CORBRP); 165 if (wp == rp) { 166 /* oops, it's full */ 167 spin_unlock_irq(&bus->reg_lock); 168 return -EAGAIN; 169 } 170 171 bus->rirb.cmds[addr]++; 172 bus->corb.buf[wp] = cpu_to_le32(val); 173 snd_hdac_chip_writew(bus, CORBWP, wp); 174 175 spin_unlock_irq(&bus->reg_lock); 176 177 return 0; 178 } 179 EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd); 180 181 #define AZX_RIRB_EX_UNSOL_EV (1<<4) 182 183 /** 184 * snd_hdac_bus_update_rirb - retrieve RIRB entries 185 * @bus: HD-audio core bus 186 * 187 * Usually called from interrupt handler. 188 * The caller needs bus->reg_lock spinlock before calling this. 189 */ 190 void snd_hdac_bus_update_rirb(struct hdac_bus *bus) 191 { 192 unsigned int rp, wp; 193 unsigned int addr; 194 u32 res, res_ex; 195 196 wp = snd_hdac_chip_readw(bus, RIRBWP); 197 if (wp == 0xffff) { 198 /* something wrong, controller likely turned to D3 */ 199 return; 200 } 201 202 if (wp == bus->rirb.wp) 203 return; 204 bus->rirb.wp = wp; 205 206 while (bus->rirb.rp != wp) { 207 bus->rirb.rp++; 208 bus->rirb.rp %= AZX_MAX_RIRB_ENTRIES; 209 210 rp = bus->rirb.rp << 1; /* an RIRB entry is 8-bytes */ 211 res_ex = le32_to_cpu(bus->rirb.buf[rp + 1]); 212 res = le32_to_cpu(bus->rirb.buf[rp]); 213 addr = res_ex & 0xf; 214 if (addr >= HDA_MAX_CODECS) { 215 dev_err(bus->dev, 216 "spurious response %#x:%#x, rp = %d, wp = %d", 217 res, res_ex, bus->rirb.rp, wp); 218 snd_BUG(); 219 } else if (res_ex & AZX_RIRB_EX_UNSOL_EV) 220 snd_hdac_bus_queue_event(bus, res, res_ex); 221 else if (bus->rirb.cmds[addr]) { 222 bus->rirb.res[addr] = res; 223 bus->rirb.cmds[addr]--; 224 if (!bus->rirb.cmds[addr] && 225 waitqueue_active(&bus->rirb_wq)) 226 wake_up(&bus->rirb_wq); 227 } else { 228 dev_err_ratelimited(bus->dev, 229 "spurious response %#x:%#x, last cmd=%#08x\n", 230 res, res_ex, bus->last_cmd[addr]); 231 } 232 } 233 } 234 EXPORT_SYMBOL_GPL(snd_hdac_bus_update_rirb); 235 236 /** 237 * snd_hdac_bus_get_response - receive a response via RIRB 238 * @bus: HD-audio core bus 239 * @addr: codec address 240 * @res: pointer to store the value, NULL when not needed 241 * 242 * Returns zero if a value is read, or a negative error code. 243 */ 244 int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr, 245 unsigned int *res) 246 { 247 unsigned long timeout; 248 unsigned long loopcounter; 249 wait_queue_entry_t wait; 250 bool warned = false; 251 252 init_wait_entry(&wait, 0); 253 timeout = jiffies + msecs_to_jiffies(1000); 254 255 for (loopcounter = 0;; loopcounter++) { 256 spin_lock_irq(&bus->reg_lock); 257 if (!bus->polling_mode) 258 prepare_to_wait(&bus->rirb_wq, &wait, 259 TASK_UNINTERRUPTIBLE); 260 if (bus->polling_mode) 261 snd_hdac_bus_update_rirb(bus); 262 if (!bus->rirb.cmds[addr]) { 263 if (res) 264 *res = bus->rirb.res[addr]; /* the last value */ 265 if (!bus->polling_mode) 266 finish_wait(&bus->rirb_wq, &wait); 267 spin_unlock_irq(&bus->reg_lock); 268 return 0; 269 } 270 spin_unlock_irq(&bus->reg_lock); 271 if (time_after(jiffies, timeout)) 272 break; 273 #define LOOP_COUNT_MAX 3000 274 if (!bus->polling_mode) { 275 schedule_timeout(msecs_to_jiffies(2)); 276 } else if (bus->needs_damn_long_delay || 277 loopcounter > LOOP_COUNT_MAX) { 278 if (loopcounter > LOOP_COUNT_MAX && !warned) { 279 dev_dbg_ratelimited(bus->dev, 280 "too slow response, last cmd=%#08x\n", 281 bus->last_cmd[addr]); 282 warned = true; 283 } 284 msleep(2); /* temporary workaround */ 285 } else { 286 udelay(10); 287 cond_resched(); 288 } 289 } 290 291 if (!bus->polling_mode) 292 finish_wait(&bus->rirb_wq, &wait); 293 294 return -EIO; 295 } 296 EXPORT_SYMBOL_GPL(snd_hdac_bus_get_response); 297 298 #define HDAC_MAX_CAPS 10 299 /** 300 * snd_hdac_bus_parse_capabilities - parse capability structure 301 * @bus: the pointer to bus object 302 * 303 * Returns 0 if successful, or a negative error code. 304 */ 305 int snd_hdac_bus_parse_capabilities(struct hdac_bus *bus) 306 { 307 unsigned int cur_cap; 308 unsigned int offset; 309 unsigned int counter = 0; 310 311 offset = snd_hdac_chip_readw(bus, LLCH); 312 313 /* Lets walk the linked capabilities list */ 314 do { 315 cur_cap = _snd_hdac_chip_readl(bus, offset); 316 317 dev_dbg(bus->dev, "Capability version: 0x%x\n", 318 (cur_cap & AZX_CAP_HDR_VER_MASK) >> AZX_CAP_HDR_VER_OFF); 319 320 dev_dbg(bus->dev, "HDA capability ID: 0x%x\n", 321 (cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF); 322 323 if (cur_cap == -1) { 324 dev_dbg(bus->dev, "Invalid capability reg read\n"); 325 break; 326 } 327 328 switch ((cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF) { 329 case AZX_ML_CAP_ID: 330 dev_dbg(bus->dev, "Found ML capability\n"); 331 bus->mlcap = bus->remap_addr + offset; 332 break; 333 334 case AZX_GTS_CAP_ID: 335 dev_dbg(bus->dev, "Found GTS capability offset=%x\n", offset); 336 bus->gtscap = bus->remap_addr + offset; 337 break; 338 339 case AZX_PP_CAP_ID: 340 /* PP capability found, the Audio DSP is present */ 341 dev_dbg(bus->dev, "Found PP capability offset=%x\n", offset); 342 bus->ppcap = bus->remap_addr + offset; 343 break; 344 345 case AZX_SPB_CAP_ID: 346 /* SPIB capability found, handler function */ 347 dev_dbg(bus->dev, "Found SPB capability\n"); 348 bus->spbcap = bus->remap_addr + offset; 349 break; 350 351 case AZX_DRSM_CAP_ID: 352 /* DMA resume capability found, handler function */ 353 dev_dbg(bus->dev, "Found DRSM capability\n"); 354 bus->drsmcap = bus->remap_addr + offset; 355 break; 356 357 default: 358 dev_err(bus->dev, "Unknown capability %d\n", cur_cap); 359 cur_cap = 0; 360 break; 361 } 362 363 counter++; 364 365 if (counter > HDAC_MAX_CAPS) { 366 dev_err(bus->dev, "We exceeded HDAC capabilities!!!\n"); 367 break; 368 } 369 370 /* read the offset of next capability */ 371 offset = cur_cap & AZX_CAP_HDR_NXT_PTR_MASK; 372 373 } while (offset); 374 375 return 0; 376 } 377 EXPORT_SYMBOL_GPL(snd_hdac_bus_parse_capabilities); 378 379 /* 380 * Lowlevel interface 381 */ 382 383 /** 384 * snd_hdac_bus_enter_link_reset - enter link reset 385 * @bus: HD-audio core bus 386 * 387 * Enter to the link reset state. 388 */ 389 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus) 390 { 391 unsigned long timeout; 392 393 /* reset controller */ 394 snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_RESET, 0); 395 396 timeout = jiffies + msecs_to_jiffies(100); 397 while ((snd_hdac_chip_readb(bus, GCTL) & AZX_GCTL_RESET) && 398 time_before(jiffies, timeout)) 399 usleep_range(500, 1000); 400 } 401 EXPORT_SYMBOL_GPL(snd_hdac_bus_enter_link_reset); 402 403 /** 404 * snd_hdac_bus_exit_link_reset - exit link reset 405 * @bus: HD-audio core bus 406 * 407 * Exit from the link reset state. 408 */ 409 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus) 410 { 411 unsigned long timeout; 412 413 snd_hdac_chip_updateb(bus, GCTL, AZX_GCTL_RESET, AZX_GCTL_RESET); 414 415 timeout = jiffies + msecs_to_jiffies(100); 416 while (!snd_hdac_chip_readb(bus, GCTL) && time_before(jiffies, timeout)) 417 usleep_range(500, 1000); 418 } 419 EXPORT_SYMBOL_GPL(snd_hdac_bus_exit_link_reset); 420 421 /* reset codec link */ 422 int snd_hdac_bus_reset_link(struct hdac_bus *bus, bool full_reset) 423 { 424 if (!full_reset) 425 goto skip_reset; 426 427 /* clear STATESTS if not in reset */ 428 if (snd_hdac_chip_readb(bus, GCTL) & AZX_GCTL_RESET) 429 snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK); 430 431 /* reset controller */ 432 snd_hdac_bus_enter_link_reset(bus); 433 434 /* delay for >= 100us for codec PLL to settle per spec 435 * Rev 0.9 section 5.5.1 436 */ 437 usleep_range(500, 1000); 438 439 /* Bring controller out of reset */ 440 snd_hdac_bus_exit_link_reset(bus); 441 442 /* Brent Chartrand said to wait >= 540us for codecs to initialize */ 443 usleep_range(1000, 1200); 444 445 skip_reset: 446 /* check to see if controller is ready */ 447 if (!snd_hdac_chip_readb(bus, GCTL)) { 448 dev_dbg(bus->dev, "controller not ready!\n"); 449 return -EBUSY; 450 } 451 452 /* detect codecs */ 453 if (!bus->codec_mask) { 454 bus->codec_mask = snd_hdac_chip_readw(bus, STATESTS); 455 dev_dbg(bus->dev, "codec_mask = 0x%lx\n", bus->codec_mask); 456 } 457 458 return 0; 459 } 460 EXPORT_SYMBOL_GPL(snd_hdac_bus_reset_link); 461 462 /* enable interrupts */ 463 static void azx_int_enable(struct hdac_bus *bus) 464 { 465 /* enable controller CIE and GIE */ 466 snd_hdac_chip_updatel(bus, INTCTL, 467 AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN, 468 AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN); 469 } 470 471 /* disable interrupts */ 472 static void azx_int_disable(struct hdac_bus *bus) 473 { 474 struct hdac_stream *azx_dev; 475 476 /* disable interrupts in stream descriptor */ 477 list_for_each_entry(azx_dev, &bus->stream_list, list) 478 snd_hdac_stream_updateb(azx_dev, SD_CTL, SD_INT_MASK, 0); 479 480 /* disable SIE for all streams & disable controller CIE and GIE */ 481 snd_hdac_chip_writel(bus, INTCTL, 0); 482 } 483 484 /* clear interrupts */ 485 static void azx_int_clear(struct hdac_bus *bus) 486 { 487 struct hdac_stream *azx_dev; 488 489 /* clear stream status */ 490 list_for_each_entry(azx_dev, &bus->stream_list, list) 491 snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); 492 493 /* clear STATESTS */ 494 snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK); 495 496 /* clear rirb status */ 497 snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK); 498 499 /* clear int status */ 500 snd_hdac_chip_writel(bus, INTSTS, AZX_INT_CTRL_EN | AZX_INT_ALL_STREAM); 501 } 502 503 /** 504 * snd_hdac_bus_init_chip - reset and start the controller registers 505 * @bus: HD-audio core bus 506 * @full_reset: Do full reset 507 */ 508 bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset) 509 { 510 if (bus->chip_init) 511 return false; 512 513 /* reset controller */ 514 snd_hdac_bus_reset_link(bus, full_reset); 515 516 /* clear interrupts */ 517 azx_int_clear(bus); 518 519 /* initialize the codec command I/O */ 520 snd_hdac_bus_init_cmd_io(bus); 521 522 /* enable interrupts after CORB/RIRB buffers are initialized above */ 523 azx_int_enable(bus); 524 525 /* program the position buffer */ 526 if (bus->use_posbuf && bus->posbuf.addr) { 527 snd_hdac_chip_writel(bus, DPLBASE, (u32)bus->posbuf.addr); 528 snd_hdac_chip_writel(bus, DPUBASE, upper_32_bits(bus->posbuf.addr)); 529 } 530 531 bus->chip_init = true; 532 533 return true; 534 } 535 EXPORT_SYMBOL_GPL(snd_hdac_bus_init_chip); 536 537 /** 538 * snd_hdac_bus_stop_chip - disable the whole IRQ and I/Os 539 * @bus: HD-audio core bus 540 */ 541 void snd_hdac_bus_stop_chip(struct hdac_bus *bus) 542 { 543 if (!bus->chip_init) 544 return; 545 546 /* disable interrupts */ 547 azx_int_disable(bus); 548 azx_int_clear(bus); 549 550 /* disable CORB/RIRB */ 551 snd_hdac_bus_stop_cmd_io(bus); 552 553 /* disable position buffer */ 554 if (bus->posbuf.addr) { 555 snd_hdac_chip_writel(bus, DPLBASE, 0); 556 snd_hdac_chip_writel(bus, DPUBASE, 0); 557 } 558 559 bus->chip_init = false; 560 } 561 EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_chip); 562 563 /** 564 * snd_hdac_bus_handle_stream_irq - interrupt handler for streams 565 * @bus: HD-audio core bus 566 * @status: INTSTS register value 567 * @ack: callback to be called for woken streams 568 * 569 * Returns the bits of handled streams, or zero if no stream is handled. 570 */ 571 int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status, 572 void (*ack)(struct hdac_bus *, 573 struct hdac_stream *)) 574 { 575 struct hdac_stream *azx_dev; 576 u8 sd_status; 577 int handled = 0; 578 579 list_for_each_entry(azx_dev, &bus->stream_list, list) { 580 if (status & azx_dev->sd_int_sta_mask) { 581 sd_status = snd_hdac_stream_readb(azx_dev, SD_STS); 582 snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); 583 handled |= 1 << azx_dev->index; 584 if ((!azx_dev->substream && !azx_dev->cstream) || 585 !azx_dev->running || !(sd_status & SD_INT_COMPLETE)) 586 continue; 587 if (ack) 588 ack(bus, azx_dev); 589 } 590 } 591 return handled; 592 } 593 EXPORT_SYMBOL_GPL(snd_hdac_bus_handle_stream_irq); 594 595 /** 596 * snd_hdac_bus_alloc_stream_pages - allocate BDL and other buffers 597 * @bus: HD-audio core bus 598 * 599 * Call this after assigning the all streams. 600 * Returns zero for success, or a negative error code. 601 */ 602 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus) 603 { 604 struct hdac_stream *s; 605 int num_streams = 0; 606 int dma_type = bus->dma_type ? bus->dma_type : SNDRV_DMA_TYPE_DEV; 607 int err; 608 609 list_for_each_entry(s, &bus->stream_list, list) { 610 /* allocate memory for the BDL for each stream */ 611 err = snd_dma_alloc_pages(dma_type, bus->dev, 612 BDL_SIZE, &s->bdl); 613 num_streams++; 614 if (err < 0) 615 return -ENOMEM; 616 } 617 618 if (WARN_ON(!num_streams)) 619 return -EINVAL; 620 /* allocate memory for the position buffer */ 621 err = snd_dma_alloc_pages(dma_type, bus->dev, 622 num_streams * 8, &bus->posbuf); 623 if (err < 0) 624 return -ENOMEM; 625 list_for_each_entry(s, &bus->stream_list, list) 626 s->posbuf = (__le32 *)(bus->posbuf.area + s->index * 8); 627 628 /* single page (at least 4096 bytes) must suffice for both ringbuffes */ 629 return snd_dma_alloc_pages(dma_type, bus->dev, PAGE_SIZE, &bus->rb); 630 } 631 EXPORT_SYMBOL_GPL(snd_hdac_bus_alloc_stream_pages); 632 633 /** 634 * snd_hdac_bus_free_stream_pages - release BDL and other buffers 635 * @bus: HD-audio core bus 636 */ 637 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus) 638 { 639 struct hdac_stream *s; 640 641 list_for_each_entry(s, &bus->stream_list, list) { 642 if (s->bdl.area) 643 snd_dma_free_pages(&s->bdl); 644 } 645 646 if (bus->rb.area) 647 snd_dma_free_pages(&bus->rb); 648 if (bus->posbuf.area) 649 snd_dma_free_pages(&bus->posbuf); 650 } 651 EXPORT_SYMBOL_GPL(snd_hdac_bus_free_stream_pages); 652 653 /** 654 * snd_hdac_bus_link_power - power up/down codec link 655 * @codec: HD-audio device 656 * @enable: whether to power-up the link 657 */ 658 void snd_hdac_bus_link_power(struct hdac_device *codec, bool enable) 659 { 660 if (enable) 661 set_bit(codec->addr, &codec->bus->codec_powered); 662 else 663 clear_bit(codec->addr, &codec->bus->codec_powered); 664 } 665 EXPORT_SYMBOL_GPL(snd_hdac_bus_link_power); 666