LXR linux/sound/soc/sof/intel/hda-bus.c

   1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
   2//
   3// This file is provided under a dual BSD/GPLv2 license.  When using or
   4// redistributing this file, you may do so under either license.
   5//
   6// Copyright(c) 2018 Intel Corporation. All rights reserved.
   7//
   8// Authors: Keyon Jie <yang.jie@linux.intel.com>
   9
  10#include <linux/io.h>
  11#include <sound/hdaudio.h>
  12#include <sound/hda_i915.h>
  13#include <sound/hda_codec.h>
  14#include <sound/hda_register.h>
  15#include "../sof-priv.h"
  16#include "hda.h"
  17
  18#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
  19#include "../../codecs/hdac_hda.h"
  20#define sof_hda_ext_ops snd_soc_hdac_hda_get_ops()
  21#else
  22#define sof_hda_ext_ops NULL
  23#endif
  24
  25#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
  26static void update_codec_wake_enable(struct hdac_bus *bus, unsigned int addr, bool link_power)
  27{
  28        unsigned int mask = snd_hdac_chip_readw(bus, WAKEEN);
  29
  30        if (link_power)
  31                mask &= ~BIT(addr);
  32        else
  33                mask |= BIT(addr);
  34
  35        snd_hdac_chip_updatew(bus, WAKEEN, STATESTS_INT_MASK, mask);
  36}
  37
  38static void sof_hda_bus_link_power(struct hdac_device *codec, bool enable)
  39{
  40        struct hdac_bus *bus = codec->bus;
  41        bool oldstate = test_bit(codec->addr, &bus->codec_powered);
  42
  43        snd_hdac_ext_bus_link_power(codec, enable);
  44
  45        if (enable == oldstate)
  46                return;
  47
  48        /*
  49         * Both codec driver and controller can hold references to
  50         * display power. To avoid unnecessary power-up/down cycles,
  51         * controller doesn't immediately release its reference.
  52         *
  53         * If the codec driver powers down the link, release
  54         * the controller reference as well.
  55         */
  56        if (codec->addr == HDA_IDISP_ADDR && !enable)
  57                snd_hdac_display_power(bus, HDA_CODEC_IDX_CONTROLLER, false);
  58
  59        /* WAKEEN needs to be set for disabled links */
  60        update_codec_wake_enable(bus, codec->addr, enable);
  61}
  62
  63static const struct hdac_bus_ops bus_core_ops = {
  64        .command = snd_hdac_bus_send_cmd,
  65        .get_response = snd_hdac_bus_get_response,
  66        .link_power = sof_hda_bus_link_power,
  67};
  68#endif
  69
  70/*
  71 * This can be used for both with/without hda link support.
  72 */
  73void sof_hda_bus_init(struct hdac_bus *bus, struct device *dev)
  74{
  75#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
  76        snd_hdac_ext_bus_init(bus, dev, &bus_core_ops, sof_hda_ext_ops);
  77#else /* CONFIG_SND_SOC_SOF_HDA */
  78        memset(bus, 0, sizeof(*bus));
  79        bus->dev = dev;
  80
  81        INIT_LIST_HEAD(&bus->stream_list);
  82
  83        bus->irq = -1;
  84
  85        /*
  86         * There is only one HDA bus atm. keep the index as 0.
  87         * Need to fix when there are more than one HDA bus.
  88         */
  89        bus->idx = 0;
  90
  91        spin_lock_init(&bus->reg_lock);
  92#endif /* CONFIG_SND_SOC_SOF_HDA */
  93}
  94