| 1 | // SPDX-License-Identifier: GPL-2.0-or-later
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| 2 | /*
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| 3 | * Power management for audio on multifunction CS5535 companion device
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| 4 | * Copyright (C) Jaya Kumar
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| 5 | */
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| 6 |
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| 7 | #include <linux/init.h>
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| 8 | #include <linux/pci.h>
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| 9 | #include <linux/delay.h>
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| 10 | #include <sound/core.h>
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| 11 | #include <sound/control.h>
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| 12 | #include <sound/initval.h>
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| 13 | #include <sound/asoundef.h>
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| 14 | #include <sound/pcm.h>
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| 15 | #include <sound/ac97_codec.h>
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| 16 | #include "cs5535audio.h"
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| 17 |
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| 18 | static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
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| 19 | {
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| 20 | /*
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| 21 | we depend on snd_ac97_suspend to tell the
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| 22 | AC97 codec to shutdown. the amd spec suggests
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| 23 | that the LNK_SHUTDOWN be done at the same time
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| 24 | that the codec power-down is issued. instead,
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| 25 | we do it just after rather than at the same
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| 26 | time. excluding codec specific build_ops->suspend
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| 27 | ac97 powerdown hits:
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| 28 | 0x8000 EAPD
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| 29 | 0x4000 Headphone amplifier
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| 30 | 0x0300 ADC & DAC
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| 31 | 0x0400 Analog Mixer powerdown (Vref on)
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| 32 | I am not sure if this is the best that we can do.
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| 33 | The remainder to be investigated are:
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| 34 | - analog mixer (vref off) 0x0800
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| 35 | - AC-link powerdown 0x1000
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| 36 | - codec internal clock 0x2000
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| 37 | */
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| 38 |
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| 39 | /* set LNK_SHUTDOWN to shutdown AC link */
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| 40 | cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);
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| 41 |
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| 42 | }
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| 43 |
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| 44 | static int __maybe_unused snd_cs5535audio_suspend(struct device *dev)
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| 45 | {
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| 46 | struct snd_card *card = dev_get_drvdata(dev);
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| 47 | struct cs5535audio *cs5535au = card->private_data;
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| 48 | int i;
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| 49 |
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| 50 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
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| 51 | snd_ac97_suspend(cs5535au->ac97);
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| 52 | for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
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| 53 | struct cs5535audio_dma *dma = &cs5535au->dmas[i];
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| 54 | if (dma && dma->substream)
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| 55 | dma->saved_prd = dma->ops->read_prd(cs5535au);
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| 56 | }
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| 57 | /* save important regs, then disable aclink in hw */
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| 58 | snd_cs5535audio_stop_hardware(cs5535au);
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| 59 | return 0;
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| 60 | }
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| 61 |
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| 62 | static int __maybe_unused snd_cs5535audio_resume(struct device *dev)
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| 63 | {
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| 64 | struct snd_card *card = dev_get_drvdata(dev);
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| 65 | struct cs5535audio *cs5535au = card->private_data;
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| 66 | u32 tmp;
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| 67 | int timeout;
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| 68 | int i;
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| 69 |
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| 70 | /* set LNK_WRM_RST to reset AC link */
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| 71 | cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
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| 72 |
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| 73 | timeout = 50;
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| 74 | do {
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| 75 | tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
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| 76 | if (tmp & PRM_RDY_STS)
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| 77 | break;
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| 78 | udelay(1);
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| 79 | } while (--timeout);
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| 80 |
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| 81 | if (!timeout)
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| 82 | dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n");
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| 83 |
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| 84 | /* set up rate regs, dma. actual initiation is done in trig */
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| 85 | for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
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| 86 | struct cs5535audio_dma *dma = &cs5535au->dmas[i];
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| 87 | if (dma && dma->substream) {
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| 88 | dma->substream->ops->prepare(dma->substream);
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| 89 | dma->ops->setup_prd(cs5535au, dma->saved_prd);
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| 90 | }
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| 91 | }
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| 92 |
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| 93 | /* we depend on ac97 to perform the codec power up */
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| 94 | snd_ac97_resume(cs5535au->ac97);
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| 95 | snd_power_change_state(card, SNDRV_CTL_POWER_D0);
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| 96 |
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| 97 | return 0;
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| 98 | }
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| 99 |
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| 100 | SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);
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