From: Takashi Iwai Date: Tue, 16 Aug 2005 14:54:12 +0000 (+0200) Subject: [ALSA] nm256 - Fix PM and irq handling X-Git-Tag: v2.6.14-rc1~1029^2~26 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1204de32d0df87892e56062042e25c775ca0e08c;p=linux-2.6 [ALSA] nm256 - Fix PM and irq handling NM256 driver - Fixed the PCM resume - restoring the rate setting - Fixed the handling of buggy irqs - Dynamically acquire/release irq handler to make the driver more robust to unknown irq storms (as OSS driver does). Signed-off-by: Takashi Iwai --- diff --git a/sound/pci/nm256/nm256.c b/sound/pci/nm256/nm256.c index 7eb20b8f89..2bbeb10ff7 100644 --- a/sound/pci/nm256/nm256.c +++ b/sound/pci/nm256/nm256.c @@ -189,6 +189,7 @@ struct snd_nm256_stream { nm256_t *chip; snd_pcm_substream_t *substream; int running; + int suspended; u32 buf; /* offset from chip->buffer */ int bufsize; /* buffer size in bytes */ @@ -231,8 +232,10 @@ struct snd_nm256 { int mixer_status_mask; /* bit mask to test the mixer status */ int irq; + int irq_acks; irqreturn_t (*interrupt)(int, void *, struct pt_regs *); int badintrcount; /* counter to check bogus interrupts */ + struct semaphore irq_mutex; nm256_stream_t streams[2]; @@ -464,6 +467,37 @@ snd_nm256_set_format(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *subs } } +/* acquire interrupt */ +static int snd_nm256_acquire_irq(nm256_t *chip) +{ + down(&chip->irq_mutex); + if (chip->irq < 0) { + if (request_irq(chip->pci->irq, chip->interrupt, SA_INTERRUPT|SA_SHIRQ, + chip->card->driver, (void*)chip)) { + snd_printk("unable to grab IRQ %d\n", chip->pci->irq); + up(&chip->irq_mutex); + return -EBUSY; + } + chip->irq = chip->pci->irq; + } + chip->irq_acks++; + up(&chip->irq_mutex); + return 0; +} + +/* release interrupt */ +static void snd_nm256_release_irq(nm256_t *chip) +{ + down(&chip->irq_mutex); + if (chip->irq_acks > 0) + chip->irq_acks--; + if (chip->irq_acks == 0 && chip->irq >= 0) { + free_irq(chip->irq, (void*)chip); + chip->irq = -1; + } + up(&chip->irq_mutex); +} + /* * start / stop */ @@ -538,15 +572,19 @@ snd_nm256_playback_trigger(snd_pcm_substream_t *substream, int cmd) spin_lock(&chip->reg_lock); switch (cmd) { - case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: + s->suspended = 0; + /* fallthru */ + case SNDRV_PCM_TRIGGER_START: if (! s->running) { snd_nm256_playback_start(chip, s, substream); s->running = 1; } break; - case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: + s->suspended = 1; + /* fallthru */ + case SNDRV_PCM_TRIGGER_STOP: if (s->running) { snd_nm256_playback_stop(chip); s->running = 0; @@ -818,6 +856,8 @@ snd_nm256_playback_open(snd_pcm_substream_t *substream) { nm256_t *chip = snd_pcm_substream_chip(substream); + if (snd_nm256_acquire_irq(chip) < 0) + return -EBUSY; snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK], substream, &snd_nm256_playback); return 0; @@ -828,6 +868,8 @@ snd_nm256_capture_open(snd_pcm_substream_t *substream) { nm256_t *chip = snd_pcm_substream_chip(substream); + if (snd_nm256_acquire_irq(chip) < 0) + return -EBUSY; snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE], substream, &snd_nm256_capture); return 0; @@ -839,6 +881,9 @@ snd_nm256_capture_open(snd_pcm_substream_t *substream) static int snd_nm256_playback_close(snd_pcm_substream_t *substream) { + nm256_t *chip = snd_pcm_substream_chip(substream); + + snd_nm256_release_irq(chip); return 0; } @@ -846,6 +891,9 @@ snd_nm256_playback_close(snd_pcm_substream_t *substream) static int snd_nm256_capture_close(snd_pcm_substream_t *substream) { + nm256_t *chip = snd_pcm_substream_chip(substream); + + snd_nm256_release_irq(chip); return 0; } @@ -915,18 +963,16 @@ snd_nm256_pcm(nm256_t *chip, int device) static void snd_nm256_init_chip(nm256_t *chip) { - spin_lock_irq(&chip->reg_lock); /* Reset everything. */ snd_nm256_writeb(chip, 0x0, 0x11); snd_nm256_writew(chip, 0x214, 0); /* stop sounds.. */ //snd_nm256_playback_stop(chip); //snd_nm256_capture_stop(chip); - spin_unlock_irq(&chip->reg_lock); } -static inline void +static irqreturn_t snd_nm256_intr_check(nm256_t *chip) { if (chip->badintrcount++ > 1000) { @@ -947,7 +993,9 @@ snd_nm256_intr_check(nm256_t *chip) if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running) snd_nm256_capture_stop(chip); chip->badintrcount = 0; + return IRQ_HANDLED; } + return IRQ_NONE; } /* @@ -969,10 +1017,8 @@ snd_nm256_interrupt(int irq, void *dev_id, struct pt_regs *dummy) status = snd_nm256_readw(chip, NM_INT_REG); /* Not ours. */ - if (status == 0) { - snd_nm256_intr_check(chip); - return IRQ_NONE; - } + if (status == 0) + return snd_nm256_intr_check(chip); chip->badintrcount = 0; @@ -1036,10 +1082,8 @@ snd_nm256_interrupt_zx(int irq, void *dev_id, struct pt_regs *dummy) status = snd_nm256_readl(chip, NM_INT_REG); /* Not ours. */ - if (status == 0) { - snd_nm256_intr_check(chip); - return IRQ_NONE; - } + if (status == 0) + return snd_nm256_intr_check(chip); chip->badintrcount = 0; @@ -1192,7 +1236,7 @@ snd_nm256_mixer(nm256_t *chip) AC97_PC_BEEP, AC97_PHONE, AC97_MIC, AC97_LINE, AC97_CD, AC97_VIDEO, AC97_AUX, AC97_PCM, AC97_REC_SEL, AC97_REC_GAIN, AC97_GENERAL_PURPOSE, AC97_3D_CONTROL, - AC97_EXTENDED_ID, + /*AC97_EXTENDED_ID,*/ AC97_VENDOR_ID1, AC97_VENDOR_ID2, -1 }; @@ -1206,6 +1250,7 @@ snd_nm256_mixer(nm256_t *chip) for (i = 0; mixer_regs[i] >= 0; i++) set_bit(mixer_regs[i], ac97.reg_accessed); ac97.private_data = chip; + pbus->no_vra = 1; err = snd_ac97_mixer(pbus, &ac97, &chip->ac97); if (err < 0) return err; @@ -1281,6 +1326,7 @@ static int nm256_suspend(snd_card_t *card, pm_message_t state) static int nm256_resume(snd_card_t *card) { nm256_t *chip = card->pm_private_data; + int i; /* Perform a full reset on the hardware */ pci_enable_device(chip->pci); @@ -1289,6 +1335,15 @@ static int nm256_resume(snd_card_t *card) /* restore ac97 */ snd_ac97_resume(chip->ac97); + for (i = 0; i < 2; i++) { + nm256_stream_t *s = &chip->streams[i]; + if (s->substream && s->suspended) { + spin_lock_irq(&chip->reg_lock); + snd_nm256_set_format(chip, s, s->substream); + spin_unlock_irq(&chip->reg_lock); + } + } + return 0; } #endif /* CONFIG_PM */ @@ -1360,6 +1415,7 @@ snd_nm256_create(snd_card_t *card, struct pci_dev *pci, chip->use_cache = usecache; spin_lock_init(&chip->reg_lock); chip->irq = -1; + init_MUTEX(&chip->irq_mutex); chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = play_bufsize; chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capt_bufsize; @@ -1470,15 +1526,6 @@ snd_nm256_create(snd_card_t *card, struct pci_dev *pci, chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr; } - /* acquire interrupt */ - if (request_irq(pci->irq, chip->interrupt, SA_INTERRUPT|SA_SHIRQ, - card->driver, (void*)chip)) { - err = -EBUSY; - snd_printk("unable to grab IRQ %d\n", pci->irq); - goto __error; - } - chip->irq = pci->irq; - /* Fixed setting. */ chip->mixer_base = NM_MIXER_OFFSET;