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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9ac25594 JK |
2 | /* |
3 | * Power management for audio on multifunction CS5535 companion device | |
4 | * Copyright (C) Jaya Kumar | |
9ac25594 JK |
5 | */ |
6 | ||
7 | #include <linux/init.h> | |
9ac25594 JK |
8 | #include <linux/pci.h> |
9 | #include <linux/delay.h> | |
9ac25594 JK |
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 | ||
fe4cb86c | 44 | static int __maybe_unused snd_cs5535audio_suspend(struct device *dev) |
9ac25594 | 45 | { |
68cb2b55 | 46 | struct snd_card *card = dev_get_drvdata(dev); |
9ac25594 JK |
47 | struct cs5535audio *cs5535au = card->private_data; |
48 | int i; | |
49 | ||
50 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
222fa0b0 | 51 | snd_ac97_suspend(cs5535au->ac97); |
9ac25594 JK |
52 | for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) { |
53 | struct cs5535audio_dma *dma = &cs5535au->dmas[i]; | |
222fa0b0 | 54 | if (dma && dma->substream) |
9ac25594 JK |
55 | dma->saved_prd = dma->ops->read_prd(cs5535au); |
56 | } | |
9ac25594 JK |
57 | /* save important regs, then disable aclink in hw */ |
58 | snd_cs5535audio_stop_hardware(cs5535au); | |
9ac25594 JK |
59 | return 0; |
60 | } | |
61 | ||
fe4cb86c | 62 | static int __maybe_unused snd_cs5535audio_resume(struct device *dev) |
9ac25594 | 63 | { |
68cb2b55 | 64 | struct snd_card *card = dev_get_drvdata(dev); |
9ac25594 JK |
65 | struct cs5535audio *cs5535au = card->private_data; |
66 | u32 tmp; | |
67 | int timeout; | |
68 | int i; | |
69 | ||
9ac25594 JK |
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) | |
00980aa9 | 82 | dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n"); |
9ac25594 | 83 | |
9ac25594 JK |
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]; | |
222fa0b0 | 87 | if (dma && dma->substream) { |
9ac25594 JK |
88 | dma->substream->ops->prepare(dma->substream); |
89 | dma->ops->setup_prd(cs5535au, dma->saved_prd); | |
90 | } | |
91 | } | |
222fa0b0 AS |
92 | |
93 | /* we depend on ac97 to perform the codec power up */ | |
94 | snd_ac97_resume(cs5535au->ac97); | |
9ac25594 JK |
95 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
68cb2b55 | 100 | SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume); |