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Commit 950fb626 authored by Trent Piepho's avatar Trent Piepho Committed by Jaroslav Kysela
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[ALSA] snd-bt87x: Power down audio ADC when not in use 



Sets a bit to power down the Bt87x's internal audio ADC when the ALSA device
isn't open, or when it is in 'digital mode' using an external ADC.

Signed-off-by: default avatarTrent Piepho <xyzzy@speakeasy.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent 57bd68b8

sound/pci/bt87x.c

+9 −3
Original line number Diff line number Diff line
@@ -377,7 +377,7 @@ static struct snd_pcm_hardware snd_bt87x_analog_hw = { 


static int snd_bt87x_set_digital_hw(struct snd_bt87x *chip, struct snd_pcm_runtime *runtime)

{

	chip->reg_control |= CTL_DA_IOM_DA;

	chip->reg_control |= CTL_DA_IOM_DA | CTL_A_PWRDN;

	runtime->hw = snd_bt87x_digital_hw;

	runtime->hw.rates = snd_pcm_rate_to_rate_bit(chip->board.dig_rate);

	runtime->hw.rate_min = chip->board.dig_rate;
@@ -398,7 +398,7 @@ static int snd_bt87x_set_analog_hw(struct snd_bt87x *chip, struct snd_pcm_runtim 
		.rats = &analog_clock

	};



	chip->reg_control &= ~CTL_DA_IOM_DA;

	chip->reg_control &= ~(CTL_DA_IOM_DA | CTL_A_PWRDN);

	runtime->hw = snd_bt87x_analog_hw;

	return snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,

					     &constraint_rates);
@@ -437,6 +437,11 @@ static int snd_bt87x_close(struct snd_pcm_substream *substream) 
{

	struct snd_bt87x *chip = snd_pcm_substream_chip(substream);



	spin_lock_irq(&chip->reg_lock);

	chip->reg_control |= CTL_A_PWRDN;

	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);

	spin_unlock_irq(&chip->reg_lock);



	chip->substream = NULL;

	clear_bit(0, &chip->opened);

	smp_mb__after_clear_bit();
@@ -751,7 +756,8 @@ static int __devinit snd_bt87x_create(struct snd_card *card, 
		goto fail;

	}



	chip->reg_control = CTL_DA_ES2 | CTL_PKTP_16 | (15 << CTL_DA_SDR_SHIFT);

	chip->reg_control = CTL_A_PWRDN | CTL_DA_ES2 |

			    CTL_PKTP_16 | (15 << CTL_DA_SDR_SHIFT);

	chip->interrupt_mask = MY_INTERRUPTS;

	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);

	snd_bt87x_writel(chip, REG_INT_MASK, 0);