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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Power management for audio on multifunction CS5535 companion device4 * Copyright (C) Jaya Kumar5 */6 7#include <linux/init.h>8#include <linux/pci.h>9#include <linux/delay.h>10#include <sound/core.h>11#include <sound/control.h>12#include <sound/initval.h>13#include <sound/asoundef.h>14#include <sound/pcm.h>15#include <sound/ac97_codec.h>16#include "cs5535audio.h"17 18static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)19{20 /* 21 we depend on snd_ac97_suspend to tell the22 AC97 codec to shutdown. the amd spec suggests23 that the LNK_SHUTDOWN be done at the same time24 that the codec power-down is issued. instead,25 we do it just after rather than at the same 26 time. excluding codec specific build_ops->suspend27 ac97 powerdown hits:28 0x8000 EAPD 29 0x4000 Headphone amplifier 30 0x0300 ADC & DAC 31 0x0400 Analog Mixer powerdown (Vref on) 32 I am not sure if this is the best that we can do.33 The remainder to be investigated are:34 - analog mixer (vref off) 0x080035 - AC-link powerdown 0x100036 - codec internal clock 0x200037 */38 39 /* set LNK_SHUTDOWN to shutdown AC link */40 cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);41 42}43 44static int __maybe_unused snd_cs5535audio_suspend(struct device *dev)45{46 struct snd_card *card = dev_get_drvdata(dev);47 struct cs5535audio *cs5535au = card->private_data;48 int i;49 50 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);51 snd_ac97_suspend(cs5535au->ac97);52 for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {53 struct cs5535audio_dma *dma = &cs5535au->dmas[i];54 if (dma && dma->substream)55 dma->saved_prd = dma->ops->read_prd(cs5535au);56 }57 /* save important regs, then disable aclink in hw */58 snd_cs5535audio_stop_hardware(cs5535au);59 return 0;60}61 62static int __maybe_unused snd_cs5535audio_resume(struct device *dev)63{64 struct snd_card *card = dev_get_drvdata(dev);65 struct cs5535audio *cs5535au = card->private_data;66 u32 tmp;67 int timeout;68 int i;69 70 /* set LNK_WRM_RST to reset AC link */71 cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);72 73 timeout = 50;74 do {75 tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);76 if (tmp & PRM_RDY_STS)77 break;78 udelay(1);79 } while (--timeout);80 81 if (!timeout)82 dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n");83 84 /* set up rate regs, dma. actual initiation is done in trig */85 for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {86 struct cs5535audio_dma *dma = &cs5535au->dmas[i];87 if (dma && dma->substream) {88 dma->substream->ops->prepare(dma->substream);89 dma->ops->setup_prd(cs5535au, dma->saved_prd);90 }91 }92 93 /* we depend on ac97 to perform the codec power up */94 snd_ac97_resume(cs5535au->ac97);95 snd_power_change_state(card, SNDRV_CTL_POWER_D0);96 97 return 0;98}99 100SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);101