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1a59d1b8e0
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Power management for audio on multifunction CS5535 companion device
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* Copyright (C) Jaya Kumar
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/initval.h>
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#include <sound/asoundef.h>
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#include <sound/pcm.h>
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#include <sound/ac97_codec.h>
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#include "cs5535audio.h"
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static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
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{
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/*
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we depend on snd_ac97_suspend to tell the
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AC97 codec to shutdown. the amd spec suggests
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that the LNK_SHUTDOWN be done at the same time
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that the codec power-down is issued. instead,
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we do it just after rather than at the same
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time. excluding codec specific build_ops->suspend
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ac97 powerdown hits:
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0x8000 EAPD
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0x4000 Headphone amplifier
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0x0300 ADC & DAC
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0x0400 Analog Mixer powerdown (Vref on)
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I am not sure if this is the best that we can do.
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The remainder to be investigated are:
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- analog mixer (vref off) 0x0800
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- AC-link powerdown 0x1000
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- codec internal clock 0x2000
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*/
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/* set LNK_SHUTDOWN to shutdown AC link */
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cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);
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}
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static int __maybe_unused snd_cs5535audio_suspend(struct device *dev)
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{
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struct snd_card *card = dev_get_drvdata(dev);
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struct cs5535audio *cs5535au = card->private_data;
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int i;
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snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
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snd_ac97_suspend(cs5535au->ac97);
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for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
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struct cs5535audio_dma *dma = &cs5535au->dmas[i];
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if (dma && dma->substream)
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dma->saved_prd = dma->ops->read_prd(cs5535au);
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}
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/* save important regs, then disable aclink in hw */
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snd_cs5535audio_stop_hardware(cs5535au);
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return 0;
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}
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static int __maybe_unused snd_cs5535audio_resume(struct device *dev)
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{
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struct snd_card *card = dev_get_drvdata(dev);
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struct cs5535audio *cs5535au = card->private_data;
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u32 tmp;
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int timeout;
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int i;
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/* set LNK_WRM_RST to reset AC link */
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cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
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timeout = 50;
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do {
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tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
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if (tmp & PRM_RDY_STS)
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break;
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udelay(1);
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} while (--timeout);
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if (!timeout)
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dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n");
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/* set up rate regs, dma. actual initiation is done in trig */
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for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
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struct cs5535audio_dma *dma = &cs5535au->dmas[i];
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if (dma && dma->substream) {
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dma->substream->ops->prepare(dma->substream);
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dma->ops->setup_prd(cs5535au, dma->saved_prd);
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}
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}
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/* we depend on ac97 to perform the codec power up */
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snd_ac97_resume(cs5535au->ac97);
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snd_power_change_state(card, SNDRV_CTL_POWER_D0);
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return 0;
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}
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SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);
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