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ALSA: hda - Add power-welll support for haswell HDA 

For Intel Haswell chip, HDA controller and codec have
power well dependency from GPU side. This patch added support
to request/release power well in audio driver. Power save
feature should be enabled to get runtime power saving.

There's deadlock when request_module(i915) in azx_probe.
It looks like:
device_lock(audio pci device) -> azx_probe -> module_request
(or symbol_request) -> modprobe (userspace) -> i915 init ->
drm_pci_init -> pci_register_driver -> bus_add_driver -> driver_attach ->
which in turn tries all locks on pci bus, and when it tries the one on the
audio device, it will deadlock.

This patch introduce a work to store remaining probe stuff, and let
request_module run in safe work context.

Signed-off-by: Wang Xingchao <xingchao.wang@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
hifive-unleashed-5.1
Wang Xingchao 2013-05-30 22:07:10 +08:00 committed by Daniel Vetter
parent 5c90680e42
commit 99a2008d0b
5 changed files with 179 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sound/pci/hda/Kconfig
View File

@ -152,6 +152,16 @@ config SND_HDA_CODEC_HDMI
snd-hda-codec-hdmi.
This module is automatically loaded at probing.
config SND_HDA_I915
bool "Build Display HD-audio controller/codec power well support for i915 cards"
depends on DRM_I915
help
Say Y here to include full HDMI and DisplayPort HD-audio controller/codec
power-well support for Intel Haswell graphics cards based on the i915 driver.
Note that this option must be enabled for Intel Haswell C+ stepping machines, otherwise
the GPU audio controller/codecs will not be initialized or damaged when exit from S3 mode.
config SND_HDA_CODEC_CIRRUS
bool "Build Cirrus Logic codec support"
default y

2
sound/pci/hda/Makefile
View File

@ -1,4 +1,6 @@
snd-hda-intel-objs := hda_intel.o
# for haswell power well
snd-hda-intel-$(CONFIG_SND_HDA_I915) += hda_i915.o
snd-hda-codec-y := hda_codec.o hda_jack.o hda_auto_parser.o
snd-hda-codec-$(CONFIG_SND_HDA_GENERIC) += hda_generic.o

75
sound/pci/hda/hda_i915.c 100644
View File

@ -0,0 +1,75 @@
/*
* hda_i915.c - routines for Haswell HDA controller power well support
*
* 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <sound/core.h>
#include <drm/i915_powerwell.h>
#include "hda_i915.h"
static void (*get_power)(void);
static void (*put_power)(void);
void hda_display_power(bool enable)
{
if (!get_power || !put_power)
return;
snd_printdd("HDA display power %s \n",
enable ? "Enable" : "Disable");
if (enable)
get_power();
else
put_power();
}
int hda_i915_init(void)
{
int err = 0;
get_power = symbol_request(i915_request_power_well);
if (!get_power) {
snd_printk(KERN_WARNING "hda-i915: get_power symbol get fail\n");
return -ENODEV;
}
put_power = symbol_request(i915_release_power_well);
if (!put_power) {
symbol_put(i915_request_power_well);
get_power = NULL;
return -ENODEV;
}
snd_printd("HDA driver get symbol successfully from i915 module\n");
return err;
}
int hda_i915_exit(void)
{
if (get_power) {
symbol_put(i915_request_power_well);
get_power = NULL;
}
if (put_power) {
symbol_put(i915_release_power_well);
put_power = NULL;
}
return 0;
}

35
sound/pci/hda/hda_i915.h 100644
View File

@ -0,0 +1,35 @@
/*
* 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.
*/
#ifndef __SOUND_HDA_I915_H
#define __SOUND_HDA_I915_H
#ifdef CONFIG_SND_HDA_I915
void hda_display_power(bool enable);
int hda_i915_init(void);
int hda_i915_exit(void);
#else
static inline void hda_display_power(bool enable) {}
static inline int hda_i915_init(void)
{
return -ENODEV;
}
static inline int hda_i915_exit(void)
{
return 0;
}
#endif
#endif

60
sound/pci/hda/hda_intel.c
View File

@ -62,6 +62,7 @@
#include <linux/vga_switcheroo.h>
#include <linux/firmware.h>
#include "hda_codec.h"
#include "hda_i915.h"
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
@ -541,6 +542,10 @@ struct azx {
/* for pending irqs */
struct work_struct irq_pending_work;
#ifdef CONFIG_SND_HDA_I915
struct work_struct probe_work;
#endif
/* reboot notifier (for mysterious hangup problem at power-down) */
struct notifier_block reboot_notifier;
@ -594,6 +599,7 @@ enum {
#define AZX_DCAPS_4K_BDLE_BOUNDARY (1 << 23) /* BDLE in 4k boundary */
#define AZX_DCAPS_COUNT_LPIB_DELAY (1 << 25) /* Take LPIB as delay */
#define AZX_DCAPS_PM_RUNTIME (1 << 26) /* runtime PM support */
#define AZX_DCAPS_I915_POWERWELL (1 << 27) /* HSW i915 power well support */
/* quirks for Intel PCH */
#define AZX_DCAPS_INTEL_PCH_NOPM \
@ -2900,6 +2906,8 @@ static int azx_suspend(struct device *dev)
pci_disable_device(pci);
pci_save_state(pci);
pci_set_power_state(pci, PCI_D3hot);
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
hda_display_power(false);
return 0;
}
@ -2912,6 +2920,8 @@ static int azx_resume(struct device *dev)
if (chip->disabled)
return 0;
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
hda_display_power(true);
pci_set_power_state(pci, PCI_D0);
pci_restore_state(pci);
if (pci_enable_device(pci) < 0) {
@ -2944,6 +2954,8 @@ static int azx_runtime_suspend(struct device *dev)
azx_stop_chip(chip);
azx_clear_irq_pending(chip);
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
hda_display_power(false);
return 0;
}
@ -2952,6 +2964,8 @@ static int azx_runtime_resume(struct device *dev)
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
hda_display_power(true);
azx_init_pci(chip);
azx_init_chip(chip, 1);
return 0;
@ -3176,6 +3190,10 @@ static int azx_free(struct azx *chip)
if (chip->fw)
release_firmware(chip->fw);
#endif
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
hda_display_power(false);
hda_i915_exit();
}
kfree(chip);
return 0;
@ -3401,6 +3419,13 @@ static void azx_check_snoop_available(struct azx *chip)
}
}
#ifdef CONFIG_SND_HDA_I915
static void azx_probe_work(struct work_struct *work)
{
azx_probe_continue(container_of(work, struct azx, probe_work));
}
#endif
/*
* constructor
*/
@ -3476,7 +3501,13 @@ static int azx_create(struct snd_card *card, struct pci_dev *pci,
return err;
}
#ifdef CONFIG_SND_HDA_I915
/* continue probing in work context as may trigger request module */
INIT_WORK(&chip->probe_work, azx_probe_work);
#endif
*rchip = chip;
return 0;
}
@ -3747,6 +3778,16 @@ static int azx_probe(struct pci_dev *pci,
}
#endif /* CONFIG_SND_HDA_PATCH_LOADER */
/* continue probing in work context, avoid request_module deadlock */
if (probe_now && (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)) {
#ifdef CONFIG_SND_HDA_I915
probe_now = false;
schedule_work(&chip->probe_work);
#else
snd_printk(KERN_ERR SFX "Haswell must build in CONFIG_SND_HDA_I915\n");
#endif
}
if (probe_now) {
err = azx_probe_continue(chip);
if (err < 0)
@ -3769,6 +3810,16 @@ static int azx_probe_continue(struct azx *chip)
int dev = chip->dev_index;
int err;
/* Request power well for Haswell HDA controller and codec */
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
err = hda_i915_init();
if (err < 0) {
snd_printk(KERN_ERR SFX "Error request power-well from i915\n");
goto out_free;
}
hda_display_power(true);
}
err = azx_first_init(chip);
if (err < 0)
goto out_free;
@ -3863,11 +3914,14 @@ static DEFINE_PCI_DEVICE_TABLE(azx_ids) = {
.driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
/* Haswell */
{ PCI_DEVICE(0x8086, 0x0a0c),
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH },
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH |
AZX_DCAPS_I915_POWERWELL },
{ PCI_DEVICE(0x8086, 0x0c0c),
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH },
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH |
AZX_DCAPS_I915_POWERWELL },
{ PCI_DEVICE(0x8086, 0x0d0c),
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH },
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH |
AZX_DCAPS_I915_POWERWELL },
/* 5 Series/3400 */
{ PCI_DEVICE(0x8086, 0x3b56),
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH_NOPM },