A NOTE has been added to this issue. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1724> ====================================================================== Reported By: Raymond Assigned To: mjander ====================================================================== Project: ALSA - driver Issue ID: 1724 Category: PCI - au88x0 Reproducibility: always Severity: block Priority: normal Status: assigned Distribution: Kernel Version: ====================================================================== Date Submitted: 01-07-2006 05:10 CET Last Modified: 07-05-2006 08:52 CEST ====================================================================== Summary: au88x0 PCM configuration problem - buffer_size constraint Description: /cvs/alsa-lib/test/pcm_min ALSA lib pcm.c:7127:(snd_pcm_set_params) Unable to set buffer time (latency) 500000 for PLAYBACK: Invalid argument Playback open error: Invalid argument sound card is au8830, the au88x0 driver only accept period size in power of 2. ====================================================================== Relationships ID Summary ---------------------------------------------------------------------- related to 0001766 jackd : ALSA: cannot set period size to... ====================================================================== ---------------------------------------------------------------------- Raymond - 07-04-06 15:19 ---------------------------------------------------------------------- Since most common rates (22050, 44100, 48000, ...) are mulitple of 3, there is some accuracy loss due to rounding as period time = period bytes / rate buffer time = buffer bytes / rate period time (min=21333 max=85334) 21334 42667 85334 buffer time (min=42666 max=1365334) 42667 85334 106667 149334 170667 213334 234667 277334 298667 341334 362667 405334 426667 469334 490667 533334 554667 597334 618667 661334 682667 725334 810667 853334 938667 981334 1066667 1109334 1194667 1237334 1322667 1365334 err = snd_pcm_hw_params_get_period_time_min(hwparams, &time_min, &dir); if (err < 0) printf("Unable to get period time min for playback: %s\n", snd_strerror(err)); err = snd_pcm_hw_params_get_period_time_max(hwparams, &time_max, &dir); if (err < 0) printf("Unable to get period time max for playback: %s\n", snd_strerror(err)); printf("period time (min=%d max=%d)\n",time_min,time_max); for (size=time_min; size<=time_max; size++) if ( snd_pcm_hw_params_test_period_time(pcm,hwparams,size,dir) == 0 ) printf(" %d\n",size); err = snd_pcm_hw_params_get_buffer_time_min(hwparams, &time_min, &dir); if (err < 0) printf("Unable to get buffer time min for playback: %s\n", snd_strerror(err)); err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &time_max, &dir); if (err < 0) printf("Unable to get buffer time max for playback: %s\n", snd_strerror(err)); printf("buffer time (min=%d max=%d)\n",time_min,time_max); for (size=time_min; size<=time_max; size++) if ( snd_pcm_hw_params_test_buffer_time(pcm,hwparams,size,dir) == 0 ) printf(" %d\n",size); ---------------------------------------------------------------------- Raymond - 07-05-06 08:52 ---------------------------------------------------------------------- alsa-lib example (i.e. pcm.c and pcm_min.c in alsa-lib-1.0.12rc1/test) can be run after comment out the power 2 constraints and set period_bytes_min to 4096 (i.e. period bytes = 4K page and the constraint period bytes is unique.) It is strange that snd_pcm_set_params() does not return error when the parameter latency is set to any value less than the time to play a sample. /* if ((err = snd_pcm_hw_constraint_pow2(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)) < 0) return err; */ ... if (VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_ADB) { runtime->hw = snd_vortex_playback_hw_adb; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { if (VORTEX_IS_QUAD(vortex)) { runtime->hw.channels_max = 4; snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, &hw_constraints_channels4); } else runtime->hw.channels_max = 2; } else runtime->hw.channels_max = 2; runtime->hw.period_bytes_min = 4096; }; However running another example (latency) freeze the computer immediately without display any message. Apply alsa-timer-irqsave.patch in https://bugtrack.alsa-project.org/alsa-bug/view.php?id=952 , running latency display the parameter but still freeze the computer immediately alsa-timer-irqsave.patch only change the spin_lock and spin_unlock at the beginning and the end of snd_timer_tasklet() How about the spin_lock() and spin_unlock() inside the while loop in snd_timer_tasklet() ? Issue History Date Modified Username Field Change ====================================================================== 01-07-06 05:10 Raymond New Issue 01-09-06 15:19 Raymond Note Added: 0007537 01-19-06 15:04 Raymond Note Deleted: 0007537 01-19-06 15:36 Raymond Note Added: 0007721 01-28-06 07:58 Raymond Note Added: 0007828 01-28-06 07:58 Raymond Note Deleted: 0007721 01-30-06 18:46 Raymond Note Added: 0007840 01-31-06 03:15 Raymond Note Added: 0007844 01-31-06 06:41 Raymond Note Edited: 0007840 01-31-06 07:03 Raymond Note Edited: 0007840 01-31-06 07:08 Raymond Note Edited: 0007840 01-31-06 07:11 Raymond Note Edited: 0007840 01-31-06 08:31 Raymond Note Edited: 0007840 01-31-06 09:48 Raymond Note Edited: 0007844 01-31-06 10:19 perex Note Added: 0007845 01-31-06 10:26 perex Note Added: 0007847 01-31-06 10:26 perex Note Edited: 0007847 01-31-06 10:48 perex Project ALSA - lib => ALSA - driver 01-31-06 10:49 perex Category 0_general => PCI - au88x0 01-31-06 10:49 perex Summary simple PCM helper function => au88x0 PCM configuration problem - buffer_size constraint 01-31-06 11:06 Raymond Note Added: 0007848 01-31-06 13:48 perex Status new => assigned 01-31-06 13:48 perex Assigned To => mjander 01-31-06 13:49 perex Relationship added related to 0001766 01-31-06 15:59 Raymond Note Added: 0007852 02-01-06 07:35 perex Note Added: 0007857 02-01-06 10:32 Raymond Note Added: 0007858 02-01-06 10:37 Raymond Note Edited: 0007848 02-01-06 17:15 Raymond Note Edited: 0007844 02-01-06 17:20 Raymond Note Added: 0007860 02-02-06 10:23 Raymond Note Added: 0007874 02-02-06 11:10 Raymond Note Edited: 0007874 02-02-06 15:48 Raymond Note Edited: 0007874 02-03-06 14:26 Raymond Note Added: 0007897 02-04-06 02:46 Raymond Note Edited: 0007874 02-04-06 02:52 Raymond Note Edited: 0007858 02-04-06 02:56 Raymond Note Edited: 0007858 02-05-06 16:39 Raymond Note Added: 0007939 02-05-06 16:48 Raymond Note Added: 0007940 02-06-06 04:40 Raymond Note Deleted: 0007939 02-06-06 06:15 Raymond Note Edited: 0007940 02-07-06 07:35 Raymond Note Added: 0007954 02-13-06 03:11 Raymond Note Added: 0008036 02-13-06 08:52 mjander Note Added: 0008039 02-13-06 16:57 Raymond Note Added: 0008055 02-13-06 17:02 Raymond Note Edited: 0008055 02-13-06 17:02 Raymond Note Edited: 0008055 02-16-06 04:01 Raymond Note Added: 0008083 02-19-06 06:31 Raymond Note Added: 0008130 02-19-06 06:39 Raymond Note Edited: 0008130 03-07-06 11:08 Raymond Note Added: 0008362 03-07-06 14:18 Raymond Note Edited: 0007844 03-24-06 10:51 Raymond File Added: snd_pcm_set_params.patch 03-30-06 18:35 Raymond Note Added: 0009036 05-22-06 15:11 Raymond Note Deleted: 0008055 05-22-06 15:12 Raymond Note Deleted: 0008362 05-22-06 15:13 Raymond Note Deleted: 0008130 05-22-06 15:14 Raymond Note Deleted: 0008083 05-22-06 15:15 Raymond Note Deleted: 0009036 05-22-06 15:16 Raymond Note Deleted: 0007860 05-22-06 15:17 Raymond Note Deleted: 0007848 05-22-06 15:20 Raymond Note Deleted: 0007940 05-22-06 15:24 Raymond Note Deleted: 0007954 05-22-06 15:48 Raymond Note Added: 0009912 05-30-06 09:36 Raymond Note Added: 0010017 05-30-06 09:38 Raymond Note Edited: 0010017 05-30-06 18:31 rlrevell Note Added: 0010020 06-30-06 13:49 Raymond File Added: test.c 06-30-06 13:53 Raymond Note Added: 0010734 06-30-06 13:55 Raymond Note Edited: 0010734 07-01-06 04:20 Raymond Note Added: 0010756 07-01-06 04:21 Raymond Note Edited: 0010756 07-01-06 04:22 Raymond Note Edited: 0010756 07-02-06 09:24 Raymond Note Added: 0010773 07-04-06 13:37 Raymond Note Added: 0010820 07-04-06 15:17 Raymond Note Edited: 0010820 07-04-06 15:19 Raymond Note Edited: 0010820 07-05-06 08:52 Raymond Note Added: 0010832 ====================================================================== Using Tomcat but need to do more? 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