| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Power management for audio on multifunction CS5535 companion device |
| 4 | * Copyright (C) Jaya Kumar |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 5 | */ |
| 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 | |
| 18 | static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au) |
| 19 | { |
| 20 | /* |
| 21 | we depend on snd_ac97_suspend to tell the |
| 22 | AC97 codec to shutdown. the amd spec suggests |
| 23 | that the LNK_SHUTDOWN be done at the same time |
| 24 | 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->suspend |
| 27 | 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) 0x0800 |
| 35 | - AC-link powerdown 0x1000 |
| 36 | - codec internal clock 0x2000 |
| 37 | */ |
| 38 | |
| 39 | /* set LNK_SHUTDOWN to shutdown AC link */ |
| 40 | cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN); |
| 41 | |
| 42 | } |
| 43 | |
| 44 | static 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); |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 | |
| 62 | static 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 | |
| 100 | SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume); |