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ALSA: emu10k1: rewire {en,dis}abling interrupts for PCM playback 

We now enable ints even before triggering, and disable them only after
stopping - otherwise there is a race condition we may plausibly run into
when we pause/resume near the end of the buffer.

Updating the epcm->running flag is moved the same way, as it affects the
*_pointer() functions, which are called by the interrupt handler.

Also, factor these out to own functions, for clarity.

For multi-channel, the extra voice is now triggered after all regular
voices - we wouldn't want to receive an int before all channels have
passed the period boundary.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230516093612.3536451-5-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Oswald Buddenhagen 2023-05-16 11:36:10 +02:00 коммит произвёл Takashi Iwai
Родитель a61c695aee
Коммит 35a60d1edf
1 изменённых файлов: 29 добавлений и 16 удалений
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45
sound/pci/emu10k1/emupcm.c
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@ -605,7 +605,9 @@ static void snd_emu10k1_playback_prepare_voice(struct snd_emu10k1 *emu, struct s
snd_emu10k1_ptr_write(emu, CVCF, voice, vattn | CVCF_CURRENTFILTER_MASK);
}
static void snd_emu10k1_playback_trigger_voice(struct snd_emu10k1 *emu, struct snd_emu10k1_voice *evoice, int master, int extra)
static void snd_emu10k1_playback_trigger_voice(struct snd_emu10k1 *emu,
struct snd_emu10k1_voice *evoice,
int master)
{
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
@ -624,24 +626,36 @@ static void snd_emu10k1_playback_trigger_voice(struct snd_emu10k1 *emu, struct s
snd_emu10k1_ptr_write(emu, PTRX_PITCHTARGET, voice, pitch_target);
if (master || evoice->epcm->type == PLAYBACK_EFX)
snd_emu10k1_ptr_write(emu, CPF_CURRENTPITCH, voice, pitch_target);
if (extra)
snd_emu10k1_voice_intr_enable(emu, voice);
}
static void snd_emu10k1_playback_stop_voice(struct snd_emu10k1 *emu, struct snd_emu10k1_voice *evoice)
static void snd_emu10k1_playback_stop_voice(struct snd_emu10k1 *emu,
struct snd_emu10k1_voice *evoice)
{
unsigned int voice;
if (evoice == NULL)
return;
voice = evoice->number;
snd_emu10k1_voice_intr_disable(emu, voice);
snd_emu10k1_ptr_write(emu, PTRX_PITCHTARGET, voice, 0);
snd_emu10k1_ptr_write(emu, CPF_CURRENTPITCH, voice, 0);
snd_emu10k1_ptr_write(emu, VTFT, voice, VTFT_FILTERTARGET_MASK);
snd_emu10k1_ptr_write(emu, CVCF, voice, CVCF_CURRENTFILTER_MASK);
}
static void snd_emu10k1_playback_set_running(struct snd_emu10k1 *emu,
struct snd_emu10k1_pcm *epcm)
{
epcm->running = 1;
snd_emu10k1_voice_intr_enable(emu, epcm->extra->number);
}
static void snd_emu10k1_playback_set_stopped(struct snd_emu10k1 *emu,
struct snd_emu10k1_pcm *epcm)
{
snd_emu10k1_voice_intr_disable(emu, epcm->extra->number);
epcm->running = 0;
}
static inline void snd_emu10k1_playback_mangle_extra(struct snd_emu10k1 *emu,
struct snd_emu10k1_pcm *epcm,
struct snd_pcm_substream *substream,
@ -687,18 +701,18 @@ static int snd_emu10k1_playback_trigger(struct snd_pcm_substream *substream,
snd_emu10k1_playback_prepare_voice(emu, epcm->voices[0], 1, mix);
snd_emu10k1_playback_prepare_voice(emu, epcm->voices[1], 0, mix);
snd_emu10k1_playback_prepare_voice(emu, epcm->extra, 1, NULL);
snd_emu10k1_playback_trigger_voice(emu, epcm->voices[0], 1, 0);
snd_emu10k1_playback_trigger_voice(emu, epcm->voices[1], 0, 0);
snd_emu10k1_playback_trigger_voice(emu, epcm->extra, 1, 1);
epcm->running = 1;
snd_emu10k1_playback_set_running(emu, epcm);
snd_emu10k1_playback_trigger_voice(emu, epcm->voices[0], 1);
snd_emu10k1_playback_trigger_voice(emu, epcm->voices[1], 0);
snd_emu10k1_playback_trigger_voice(emu, epcm->extra, 1);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
epcm->running = 0;
snd_emu10k1_playback_stop_voice(emu, epcm->voices[0]);
snd_emu10k1_playback_stop_voice(emu, epcm->voices[1]);
snd_emu10k1_playback_stop_voice(emu, epcm->extra);
snd_emu10k1_playback_set_stopped(emu, epcm);
break;
default:
result = -EINVAL;
@ -836,20 +850,19 @@ static int snd_emu10k1_efx_playback_trigger(struct snd_pcm_substream *substream,
for (i = 1; i < NUM_EFX_PLAYBACK; i++)
snd_emu10k1_playback_prepare_voice(emu, epcm->voices[i], 0,
&emu->efx_pcm_mixer[i]);
snd_emu10k1_playback_trigger_voice(emu, epcm->voices[0], 0, 0);
snd_emu10k1_playback_trigger_voice(emu, epcm->extra, 1, 1);
for (i = 1; i < NUM_EFX_PLAYBACK; i++)
snd_emu10k1_playback_trigger_voice(emu, epcm->voices[i], 0, 0);
epcm->running = 1;
snd_emu10k1_playback_set_running(emu, epcm);
for (i = 0; i < NUM_EFX_PLAYBACK; i++)
snd_emu10k1_playback_trigger_voice(emu, epcm->voices[i], 0);
snd_emu10k1_playback_trigger_voice(emu, epcm->extra, 1);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
epcm->running = 0;
for (i = 0; i < NUM_EFX_PLAYBACK; i++) {
snd_emu10k1_playback_stop_voice(emu, epcm->voices[i]);
}
snd_emu10k1_playback_stop_voice(emu, epcm->extra);
snd_emu10k1_playback_set_stopped(emu, epcm);
break;
default:
result = -EINVAL;