159 строки
4.2 KiB
C
159 строки
4.2 KiB
C
/*
|
|
* hdac_i915.c - routines for sync between HD-A core and i915 display driver
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <sound/core.h>
|
|
#include <sound/hdaudio.h>
|
|
#include <sound/hda_i915.h>
|
|
#include <sound/hda_register.h>
|
|
|
|
static struct completion bind_complete;
|
|
|
|
#define CONTROLLER_IN_GPU(pci) (((pci)->device == 0x0a0c) || \
|
|
((pci)->device == 0x0c0c) || \
|
|
((pci)->device == 0x0d0c) || \
|
|
((pci)->device == 0x160c))
|
|
|
|
/**
|
|
* snd_hdac_i915_set_bclk - Reprogram BCLK for HSW/BDW
|
|
* @bus: HDA core bus
|
|
*
|
|
* Intel HSW/BDW display HDA controller is in GPU. Both its power and link BCLK
|
|
* depends on GPU. Two Extended Mode registers EM4 (M value) and EM5 (N Value)
|
|
* are used to convert CDClk (Core Display Clock) to 24MHz BCLK:
|
|
* BCLK = CDCLK * M / N
|
|
* The values will be lost when the display power well is disabled and need to
|
|
* be restored to avoid abnormal playback speed.
|
|
*
|
|
* Call this function at initializing and changing power well, as well as
|
|
* at ELD notifier for the hotplug.
|
|
*/
|
|
void snd_hdac_i915_set_bclk(struct hdac_bus *bus)
|
|
{
|
|
struct drm_audio_component *acomp = bus->audio_component;
|
|
struct pci_dev *pci = to_pci_dev(bus->dev);
|
|
int cdclk_freq;
|
|
unsigned int bclk_m, bclk_n;
|
|
|
|
if (!acomp || !acomp->ops || !acomp->ops->get_cdclk_freq)
|
|
return; /* only for i915 binding */
|
|
if (!CONTROLLER_IN_GPU(pci))
|
|
return; /* only HSW/BDW */
|
|
|
|
cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev);
|
|
switch (cdclk_freq) {
|
|
case 337500:
|
|
bclk_m = 16;
|
|
bclk_n = 225;
|
|
break;
|
|
|
|
case 450000:
|
|
default: /* default CDCLK 450MHz */
|
|
bclk_m = 4;
|
|
bclk_n = 75;
|
|
break;
|
|
|
|
case 540000:
|
|
bclk_m = 4;
|
|
bclk_n = 90;
|
|
break;
|
|
|
|
case 675000:
|
|
bclk_m = 8;
|
|
bclk_n = 225;
|
|
break;
|
|
}
|
|
|
|
snd_hdac_chip_writew(bus, HSW_EM4, bclk_m);
|
|
snd_hdac_chip_writew(bus, HSW_EM5, bclk_n);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk);
|
|
|
|
static int i915_component_master_match(struct device *dev, void *data)
|
|
{
|
|
return !strcmp(dev->driver->name, "i915");
|
|
}
|
|
|
|
/* check whether intel graphics is present */
|
|
static bool i915_gfx_present(void)
|
|
{
|
|
static const struct pci_device_id ids[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
|
|
.class = PCI_BASE_CLASS_DISPLAY << 16,
|
|
.class_mask = 0xff << 16 },
|
|
{}
|
|
};
|
|
return pci_dev_present(ids);
|
|
}
|
|
|
|
static int i915_master_bind(struct device *dev,
|
|
struct drm_audio_component *acomp)
|
|
{
|
|
complete_all(&bind_complete);
|
|
/* clear audio_ops here as it was needed only for completion call */
|
|
acomp->audio_ops = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static const struct drm_audio_component_audio_ops i915_init_ops = {
|
|
.master_bind = i915_master_bind
|
|
};
|
|
|
|
/**
|
|
* snd_hdac_i915_init - Initialize i915 audio component
|
|
* @bus: HDA core bus
|
|
*
|
|
* This function is supposed to be used only by a HD-audio controller
|
|
* driver that needs the interaction with i915 graphics.
|
|
*
|
|
* This function initializes and sets up the audio component to communicate
|
|
* with i915 graphics driver.
|
|
*
|
|
* Returns zero for success or a negative error code.
|
|
*/
|
|
int snd_hdac_i915_init(struct hdac_bus *bus)
|
|
{
|
|
struct drm_audio_component *acomp;
|
|
int err;
|
|
|
|
if (!i915_gfx_present())
|
|
return -ENODEV;
|
|
|
|
init_completion(&bind_complete);
|
|
|
|
err = snd_hdac_acomp_init(bus, &i915_init_ops,
|
|
i915_component_master_match,
|
|
sizeof(struct i915_audio_component) - sizeof(*acomp));
|
|
if (err < 0)
|
|
return err;
|
|
acomp = bus->audio_component;
|
|
if (!acomp)
|
|
return -ENODEV;
|
|
if (!acomp->ops) {
|
|
request_module("i915");
|
|
/* 10s timeout */
|
|
wait_for_completion_timeout(&bind_complete,
|
|
msecs_to_jiffies(10 * 1000));
|
|
}
|
|
if (!acomp->ops) {
|
|
dev_info(bus->dev, "couldn't bind with audio component\n");
|
|
snd_hdac_acomp_exit(bus);
|
|
return -ENODEV;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
|