101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Power management for audio on multifunction CS5535 companion device
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* Copyright (C) Jaya Kumar
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/initval.h>
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#include <sound/asoundef.h>
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#include <sound/pcm.h>
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#include <sound/ac97_codec.h>
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#include "cs5535audio.h"
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static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
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{
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/*
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we depend on snd_ac97_suspend to tell the
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AC97 codec to shutdown. the amd spec suggests
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that the LNK_SHUTDOWN be done at the same time
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that the codec power-down is issued. instead,
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we do it just after rather than at the same
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time. excluding codec specific build_ops->suspend
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ac97 powerdown hits:
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0x8000 EAPD
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0x4000 Headphone amplifier
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0x0300 ADC & DAC
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0x0400 Analog Mixer powerdown (Vref on)
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I am not sure if this is the best that we can do.
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The remainder to be investigated are:
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- analog mixer (vref off) 0x0800
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- AC-link powerdown 0x1000
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- codec internal clock 0x2000
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*/
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/* set LNK_SHUTDOWN to shutdown AC link */
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cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);
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}
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static int __maybe_unused snd_cs5535audio_suspend(struct device *dev)
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{
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struct snd_card *card = dev_get_drvdata(dev);
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struct cs5535audio *cs5535au = card->private_data;
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int i;
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snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
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snd_ac97_suspend(cs5535au->ac97);
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for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
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struct cs5535audio_dma *dma = &cs5535au->dmas[i];
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if (dma && dma->substream)
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dma->saved_prd = dma->ops->read_prd(cs5535au);
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}
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/* save important regs, then disable aclink in hw */
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snd_cs5535audio_stop_hardware(cs5535au);
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return 0;
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}
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static int __maybe_unused snd_cs5535audio_resume(struct device *dev)
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{
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struct snd_card *card = dev_get_drvdata(dev);
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struct cs5535audio *cs5535au = card->private_data;
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u32 tmp;
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int timeout;
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int i;
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/* set LNK_WRM_RST to reset AC link */
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cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
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timeout = 50;
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do {
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tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
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if (tmp & PRM_RDY_STS)
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break;
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udelay(1);
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} while (--timeout);
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if (!timeout)
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dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n");
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/* set up rate regs, dma. actual initiation is done in trig */
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for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
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struct cs5535audio_dma *dma = &cs5535au->dmas[i];
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if (dma && dma->substream) {
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dma->substream->ops->prepare(dma->substream);
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dma->ops->setup_prd(cs5535au, dma->saved_prd);
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}
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}
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/* we depend on ac97 to perform the codec power up */
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snd_ac97_resume(cs5535au->ac97);
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snd_power_change_state(card, SNDRV_CTL_POWER_D0);
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return 0;
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}
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SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);
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