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Commit 6e2efaac authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Takashi Iwai
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sound: ymfpci: increase timer resolution to 96 kHz 



Allow the interval timer to be programmed with its full 96 kHz
precision.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent ed680c4a

include/sound/ymfpci.h

+1 −0
Original line number Diff line number Diff line
@@ -331,6 +331,7 @@ struct snd_ymfpci { 
	struct snd_ac97 *ac97;

	struct snd_rawmidi *rawmidi;

	struct snd_timer *timer;

	unsigned int timer_ticks;



	struct pci_dev *pci;

	struct snd_card *card;

sound/pci/ymfpci/ymfpci_main.c

+15 −5
Original line number Diff line number Diff line
@@ -834,7 +834,7 @@ static irqreturn_t snd_ymfpci_interrupt(int irq, void *dev_id) 
	status = snd_ymfpci_readw(chip, YDSXGR_INTFLAG);

	if (status & 1) {

		if (chip->timer)

			snd_timer_interrupt(chip->timer, chip->timer->sticks);

			snd_timer_interrupt(chip->timer, chip->timer_ticks);

	}

	snd_ymfpci_writew(chip, YDSXGR_INTFLAG, status);
@@ -1885,8 +1885,18 @@ static int snd_ymfpci_timer_start(struct snd_timer *timer) 
	unsigned int count;



	chip = snd_timer_chip(timer);

	count = (timer->sticks << 1) - 1;

	spin_lock_irqsave(&chip->reg_lock, flags);

	if (timer->sticks > 1) {

		chip->timer_ticks = timer->sticks;

		count = timer->sticks - 1;

	} else {

		/*

		 * Divisor 1 is not allowed; fake it by using divisor 2 and

		 * counting two ticks for each interrupt.

		 */

		chip->timer_ticks = 2;

		count = 2 - 1;

	}

	snd_ymfpci_writew(chip, YDSXGR_TIMERCOUNT, count);

	snd_ymfpci_writeb(chip, YDSXGR_TIMERCTRL, 0x03);

	spin_unlock_irqrestore(&chip->reg_lock, flags);
@@ -1909,14 +1919,14 @@ static int snd_ymfpci_timer_precise_resolution(struct snd_timer *timer, 
					       unsigned long *num, unsigned long *den)

{

	*num = 1;

	*den = 48000;

	*den = 96000;

	return 0;

}



static struct snd_timer_hardware snd_ymfpci_timer_hw = {

	.flags = SNDRV_TIMER_HW_AUTO,

	.resolution = 20833, /* 1/fs = 20.8333...us */

	.ticks = 0x8000,

	.resolution = 10417, /* 1 / 96 kHz = 10.41666...us */

	.ticks = 0x10000,

	.start = snd_ymfpci_timer_start,

	.stop = snd_ymfpci_timer_stop,

	.precise_resolution = snd_ymfpci_timer_precise_resolution,