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ALSA: ctxfi - Use native timer interrupt on emu20k1

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emu20k1 has a native timer interrupt based on the audio clock, which
is more accurate than the system timer (from the synchronization POV).
This patch adds the code to handle this with multiple streams.

The system timer is still used on emu20k2, and can be used also for
emu20k1 easily by changing USE_SYSTEM_TIMER to 1 in cttimer.c.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2009-06-05 16:11:07 +02:00
parent 6bc5874a1d
commit b7bbf87608
9 changed files with 543 additions and 105 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
sound/pci/ctxfi/ctatc.c
View File

@@ -22,6 +22,7 @@
#include "ctsrc.h"
#include "ctamixer.h"
#include "ctdaio.h"
#include "cttimer.h"
#include <linux/delay.h>
#include <sound/pcm.h>
#include <sound/control.h>
@@ -307,6 +308,8 @@ static int atc_pcm_playback_prepare(struct ct_atc *atc, struct ct_atc_pcm *apcm)
src = apcm->src;
}
ct_timer_prepare(apcm->timer);
return 0;
error1:
@@ -389,6 +392,7 @@ static int atc_pcm_playback_start(struct ct_atc *atc, struct ct_atc_pcm *apcm)
src->ops->set_state(src, SRC_STATE_INIT);
src->ops->commit_write(src);
ct_timer_start(apcm->timer);
return 0;
}
@@ -397,6 +401,8 @@ static int atc_pcm_stop(struct ct_atc *atc, struct ct_atc_pcm *apcm)
struct src *src = NULL;
int i = 0;
ct_timer_stop(apcm->timer);
src = apcm->src;
src->ops->set_bm(src, 0);
src->ops->set_state(src, SRC_STATE_OFF);
@@ -701,6 +707,8 @@ static int atc_pcm_capture_prepare(struct ct_atc *atc, struct ct_atc_pcm *apcm)
}
}
ct_timer_prepare(apcm->timer);
return 0;
}
@@ -749,6 +757,7 @@ static int atc_pcm_capture_start(struct ct_atc *atc, struct ct_atc_pcm *apcm)
/* Enable relevant SRCs synchronously */
src_mgr->commit_write(src_mgr);
ct_timer_start(apcm->timer);
return 0;
}
@@ -906,6 +915,8 @@ spdif_passthru_playback_prepare(struct ct_atc *atc, struct ct_atc_pcm *apcm)
dao->ops->set_right_input(dao, &amixer->rsc);
spin_unlock_irqrestore(&atc->atc_lock, flags);
ct_timer_prepare(apcm->timer);
return 0;
}
@@ -1100,6 +1111,11 @@ static int ct_atc_destroy(struct ct_atc *atc)
if (NULL == atc)
return 0;
if (atc->timer) {
ct_timer_free(atc->timer);
atc->timer = NULL;
}
/* Stop hardware and disable all interrupts */
if (NULL != atc->hw)
((struct hw *)atc->hw)->card_stop(atc->hw);
@@ -1586,6 +1602,10 @@ int ct_atc_create(struct snd_card *card, struct pci_dev *pci,
/* Build topology */
atc_connect_resources(atc);
atc->timer = ct_timer_new(atc);
if (!atc->timer)
goto error1;
atc->create_alsa_devs = ct_create_alsa_devs;
err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, atc, &ops);
@@ -1602,4 +1622,3 @@ error1:
printk(KERN_ERR "ctxfi: Something wrong!!!\n");
return err;
}