442 lines
12 KiB
C
442 lines
12 KiB
C
/*
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* hdac_i915.c - routines for sync between HD-A core and i915 display driver
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/component.h>
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#include <drm/i915_component.h>
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#include <sound/core.h>
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#include <sound/hdaudio.h>
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#include <sound/hda_i915.h>
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#include <sound/hda_register.h>
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static struct i915_audio_component *hdac_acomp;
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/**
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* snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
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* @bus: HDA core bus
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* @enable: enable or disable the wakeup
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function should be called during the chip reset, also called at
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* resume for updating STATESTS register read.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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if (!acomp || !acomp->ops)
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return -ENODEV;
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if (!acomp->ops->codec_wake_override) {
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dev_warn(bus->dev,
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"Invalid codec wake callback\n");
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return 0;
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}
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dev_dbg(bus->dev, "%s codec wakeup\n",
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enable ? "enable" : "disable");
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acomp->ops->codec_wake_override(acomp->dev, enable);
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
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/**
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* snd_hdac_display_power - Power up / down the power refcount
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* @bus: HDA core bus
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* @enable: power up or down
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function manages a refcount and calls the i915 get_power() and
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* put_power() ops accordingly, toggling the codec wakeup, too.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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if (!acomp || !acomp->ops)
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return -ENODEV;
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dev_dbg(bus->dev, "display power %s\n",
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enable ? "enable" : "disable");
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if (enable) {
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if (!bus->i915_power_refcount++) {
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acomp->ops->get_power(acomp->dev);
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snd_hdac_set_codec_wakeup(bus, true);
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snd_hdac_set_codec_wakeup(bus, false);
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}
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} else {
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WARN_ON(!bus->i915_power_refcount);
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if (!--bus->i915_power_refcount)
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acomp->ops->put_power(acomp->dev);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_display_power);
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#define CONTROLLER_IN_GPU(pci) (((pci)->device == 0x0a0c) || \
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((pci)->device == 0x0c0c) || \
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((pci)->device == 0x0d0c) || \
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((pci)->device == 0x160c))
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/**
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* snd_hdac_i915_set_bclk - Reprogram BCLK for HSW/BDW
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* @bus: HDA core bus
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*
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* Intel HSW/BDW display HDA controller is in GPU. Both its power and link BCLK
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* depends on GPU. Two Extended Mode registers EM4 (M value) and EM5 (N Value)
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* are used to convert CDClk (Core Display Clock) to 24MHz BCLK:
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* BCLK = CDCLK * M / N
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* The values will be lost when the display power well is disabled and need to
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* be restored to avoid abnormal playback speed.
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*
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* Call this function at initializing and changing power well, as well as
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* at ELD notifier for the hotplug.
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*/
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void snd_hdac_i915_set_bclk(struct hdac_bus *bus)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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struct pci_dev *pci = to_pci_dev(bus->dev);
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int cdclk_freq;
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unsigned int bclk_m, bclk_n;
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if (!acomp || !acomp->ops || !acomp->ops->get_cdclk_freq)
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return; /* only for i915 binding */
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if (!CONTROLLER_IN_GPU(pci))
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return; /* only HSW/BDW */
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cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev);
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switch (cdclk_freq) {
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case 337500:
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bclk_m = 16;
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bclk_n = 225;
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break;
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case 450000:
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default: /* default CDCLK 450MHz */
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bclk_m = 4;
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bclk_n = 75;
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break;
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case 540000:
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bclk_m = 4;
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bclk_n = 90;
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break;
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case 675000:
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bclk_m = 8;
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bclk_n = 225;
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break;
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}
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snd_hdac_chip_writew(bus, HSW_EM4, bclk_m);
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snd_hdac_chip_writew(bus, HSW_EM5, bclk_n);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk);
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/* There is a fixed mapping between audio pin node and display port.
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* on SNB, IVY, HSW, BSW, SKL, BXT, KBL:
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* Pin Widget 5 - PORT B (port = 1 in i915 driver)
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* Pin Widget 6 - PORT C (port = 2 in i915 driver)
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* Pin Widget 7 - PORT D (port = 3 in i915 driver)
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*
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* on VLV, ILK:
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* Pin Widget 4 - PORT B (port = 1 in i915 driver)
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* Pin Widget 5 - PORT C (port = 2 in i915 driver)
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* Pin Widget 6 - PORT D (port = 3 in i915 driver)
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*/
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static int pin2port(struct hdac_device *codec, hda_nid_t pin_nid)
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{
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int base_nid;
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switch (codec->vendor_id) {
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case 0x80860054: /* ILK */
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case 0x80862804: /* ILK */
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case 0x80862882: /* VLV */
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base_nid = 3;
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break;
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default:
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base_nid = 4;
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break;
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}
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if (WARN_ON(pin_nid <= base_nid || pin_nid > base_nid + 3))
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return -1;
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return pin_nid - base_nid;
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}
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/**
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* snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
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* @codec: HDA codec
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* @nid: the pin widget NID
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* @dev_id: device identifier
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* @rate: the sample rate to set
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function sets N/CTS value based on the given sample rate.
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* Returns zero for success, or a negative error code.
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*/
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int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid,
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int dev_id, int rate)
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{
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struct hdac_bus *bus = codec->bus;
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struct i915_audio_component *acomp = bus->audio_component;
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int port, pipe;
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if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
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return -ENODEV;
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port = pin2port(codec, nid);
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if (port < 0)
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return -EINVAL;
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pipe = dev_id;
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return acomp->ops->sync_audio_rate(acomp->dev, port, pipe, rate);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
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/**
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* snd_hdac_acomp_get_eld - Get the audio state and ELD via component
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* @codec: HDA codec
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* @nid: the pin widget NID
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* @dev_id: device identifier
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* @audio_enabled: the pointer to store the current audio state
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* @buffer: the buffer pointer to store ELD bytes
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* @max_bytes: the max bytes to be stored on @buffer
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function queries the current state of the audio on the given
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* digital port and fetches the ELD bytes onto the given buffer.
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* It returns the number of bytes for the total ELD data, zero for
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* invalid ELD, or a negative error code.
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*
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* The return size is the total bytes required for the whole ELD bytes,
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* thus it may be over @max_bytes. If it's over @max_bytes, it implies
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* that only a part of ELD bytes have been fetched.
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*/
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int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id,
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bool *audio_enabled, char *buffer, int max_bytes)
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{
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struct hdac_bus *bus = codec->bus;
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struct i915_audio_component *acomp = bus->audio_component;
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int port, pipe;
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if (!acomp || !acomp->ops || !acomp->ops->get_eld)
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return -ENODEV;
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port = pin2port(codec, nid);
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if (port < 0)
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return -EINVAL;
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pipe = dev_id;
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return acomp->ops->get_eld(acomp->dev, port, pipe, audio_enabled,
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buffer, max_bytes);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
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static int hdac_component_master_bind(struct device *dev)
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{
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struct i915_audio_component *acomp = hdac_acomp;
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int ret;
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ret = component_bind_all(dev, acomp);
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if (ret < 0)
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return ret;
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if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
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acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
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ret = -EINVAL;
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goto out_unbind;
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}
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/*
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* Atm, we don't support dynamic unbinding initiated by the child
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* component, so pin its containing module until we unbind.
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*/
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if (!try_module_get(acomp->ops->owner)) {
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ret = -ENODEV;
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goto out_unbind;
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}
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return 0;
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out_unbind:
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component_unbind_all(dev, acomp);
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return ret;
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}
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static void hdac_component_master_unbind(struct device *dev)
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{
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struct i915_audio_component *acomp = hdac_acomp;
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module_put(acomp->ops->owner);
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component_unbind_all(dev, acomp);
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WARN_ON(acomp->ops || acomp->dev);
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}
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static const struct component_master_ops hdac_component_master_ops = {
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.bind = hdac_component_master_bind,
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.unbind = hdac_component_master_unbind,
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};
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static int hdac_component_master_match(struct device *dev, void *data)
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{
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/* i915 is the only supported component */
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return !strcmp(dev->driver->name, "i915");
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}
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/**
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* snd_hdac_i915_register_notifier - Register i915 audio component ops
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* @aops: i915 audio component ops
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function sets the given ops to be called by the i915 graphics driver.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops)
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{
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if (WARN_ON(!hdac_acomp))
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return -ENODEV;
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hdac_acomp->audio_ops = aops;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);
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/* check whether intel graphics is present */
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static bool i915_gfx_present(void)
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{
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static struct pci_device_id ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
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.class = PCI_BASE_CLASS_DISPLAY << 16,
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.class_mask = 0xff << 16 },
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{}
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};
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return pci_dev_present(ids);
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}
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/**
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* snd_hdac_i915_init - Initialize i915 audio component
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* @bus: HDA core bus
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function initializes and sets up the audio component to communicate
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* with i915 graphics driver.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_i915_init(struct hdac_bus *bus)
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{
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struct component_match *match = NULL;
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struct device *dev = bus->dev;
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struct i915_audio_component *acomp;
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int ret;
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if (WARN_ON(hdac_acomp))
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return -EBUSY;
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if (!i915_gfx_present())
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return -ENODEV;
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acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
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if (!acomp)
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return -ENOMEM;
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bus->audio_component = acomp;
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hdac_acomp = acomp;
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component_match_add(dev, &match, hdac_component_master_match, bus);
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ret = component_master_add_with_match(dev, &hdac_component_master_ops,
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match);
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if (ret < 0)
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goto out_err;
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/*
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* Atm, we don't support deferring the component binding, so make sure
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* i915 is loaded and that the binding successfully completes.
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*/
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request_module("i915");
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if (!acomp->ops) {
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ret = -ENODEV;
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goto out_master_del;
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}
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dev_dbg(dev, "bound to i915 component master\n");
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return 0;
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out_master_del:
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component_master_del(dev, &hdac_component_master_ops);
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out_err:
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kfree(acomp);
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bus->audio_component = NULL;
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hdac_acomp = NULL;
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dev_info(dev, "failed to add i915 component master (%d)\n", ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
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/**
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* snd_hdac_i915_exit - Finalize i915 audio component
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* @bus: HDA core bus
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function releases the i915 audio component that has been used.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_i915_exit(struct hdac_bus *bus)
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{
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struct device *dev = bus->dev;
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struct i915_audio_component *acomp = bus->audio_component;
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if (!acomp)
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return 0;
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WARN_ON(bus->i915_power_refcount);
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if (bus->i915_power_refcount > 0 && acomp->ops)
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acomp->ops->put_power(acomp->dev);
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component_master_del(dev, &hdac_component_master_ops);
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kfree(acomp);
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bus->audio_component = NULL;
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hdac_acomp = NULL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_i915_exit);
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