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1/*
2 * Power management for audio on multifunction CS5535 companion device
3 * Copyright (C) Jaya Kumar
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21#include <linux/init.h>
22#include <linux/pci.h>
23#include <linux/delay.h>
24#include <sound/core.h>
25#include <sound/control.h>
26#include <sound/initval.h>
27#include <sound/asoundef.h>
28#include <sound/pcm.h>
29#include <sound/ac97_codec.h>
30#include "cs5535audio.h"
31
32static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
33{
34 /*
35 we depend on snd_ac97_suspend to tell the
36 AC97 codec to shutdown. the amd spec suggests
37 that the LNK_SHUTDOWN be done at the same time
38 that the codec power-down is issued. instead,
39 we do it just after rather than at the same
40 time. excluding codec specific build_ops->suspend
41 ac97 powerdown hits:
42 0x8000 EAPD
43 0x4000 Headphone amplifier
44 0x0300 ADC & DAC
45 0x0400 Analog Mixer powerdown (Vref on)
46 I am not sure if this is the best that we can do.
47 The remainder to be investigated are:
48 - analog mixer (vref off) 0x0800
49 - AC-link powerdown 0x1000
50 - codec internal clock 0x2000
51 */
52
53 /* set LNK_SHUTDOWN to shutdown AC link */
54 cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);
55
56}
57
58static int snd_cs5535audio_suspend(struct device *dev)
59{
60 struct snd_card *card = dev_get_drvdata(dev);
61 struct cs5535audio *cs5535au = card->private_data;
62 int i;
63
64 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
65 snd_pcm_suspend_all(cs5535au->pcm);
66 snd_ac97_suspend(cs5535au->ac97);
67 for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
68 struct cs5535audio_dma *dma = &cs5535au->dmas[i];
69 if (dma && dma->substream)
70 dma->saved_prd = dma->ops->read_prd(cs5535au);
71 }
72 /* save important regs, then disable aclink in hw */
73 snd_cs5535audio_stop_hardware(cs5535au);
74 return 0;
75}
76
77static int snd_cs5535audio_resume(struct device *dev)
78{
79 struct snd_card *card = dev_get_drvdata(dev);
80 struct cs5535audio *cs5535au = card->private_data;
81 u32 tmp;
82 int timeout;
83 int i;
84
85 /* set LNK_WRM_RST to reset AC link */
86 cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
87
88 timeout = 50;
89 do {
90 tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
91 if (tmp & PRM_RDY_STS)
92 break;
93 udelay(1);
94 } while (--timeout);
95
96 if (!timeout)
97 dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n");
98
99 /* set up rate regs, dma. actual initiation is done in trig */
100 for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
101 struct cs5535audio_dma *dma = &cs5535au->dmas[i];
102 if (dma && dma->substream) {
103 dma->substream->ops->prepare(dma->substream);
104 dma->ops->setup_prd(cs5535au, dma->saved_prd);
105 }
106 }
107
108 /* we depend on ac97 to perform the codec power up */
109 snd_ac97_resume(cs5535au->ac97);
110 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
111
112 return 0;
113}
114
115SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Power management for audio on multifunction CS5535 companion device
4 * Copyright (C) Jaya Kumar
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
18static 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
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);