Haswell Display audio depends on power well in graphic side, it should request power well before use it and release power well after use. I915 will not shutdown power well if it detects audio is using. This patch protects display audio crash for Intel Haswell C3 stepping board.

Signed-off-by: Wang Xingchao xingchao.wang@linux.intel.com --- drivers/gpu/drm/i915/intel_pm.c | 75 +++++++++++++++++++++++++++++++++++---- include/drm/i915_powerwell.h | 36 +++++++++++++++++++ 2 files changed, 104 insertions(+), 7 deletions(-) create mode 100644 include/drm/i915_powerwell.h

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 0f4b46e..88820e1 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4344,18 +4344,12 @@ bool intel_using_power_well(struct drm_device *dev) return true; }

-void intel_set_power_well(struct drm_device *dev, bool enable) +static void enable_power_well(struct drm_device *dev, bool enable) { struct drm_i915_private *dev_priv = dev->dev_private; bool is_enabled, enable_requested; uint32_t tmp;

- if (!HAS_POWER_WELL(dev)) - return; - - if (!i915_disable_power_well && !enable) - return; - tmp = I915_READ(HSW_PWR_WELL_DRIVER); is_enabled = tmp & HSW_PWR_WELL_STATE; enable_requested = tmp & HSW_PWR_WELL_ENABLE; @@ -4378,6 +4372,73 @@ void intel_set_power_well(struct drm_device *dev, bool enable) } }

+/* Global drm_device for display audio drvier usage */ +static struct drm_device *power_well_device; +/* Lock protecting power well setting */ +static DEFINE_SPINLOCK(powerwell_lock); +static bool i915_power_well_using; +static int hsw_power_count; + +void i915_request_power_well(void) +{ + if (!power_well_device) + return; + + if (!IS_HASWELL(power_well_device)) + return; + + spin_lock_irq(&powerwell_lock); + if (!hsw_power_count++ && !i915_power_well_using) + enable_power_well(power_well_device, true); + spin_unlock_irq(&powerwell_lock); +} +EXPORT_SYMBOL_GPL(i915_request_power_well); + +void i915_release_power_well(void) +{ + if (!power_well_device) + return; + + if (!IS_HASWELL(power_well_device)) + return; + + spin_lock_irq(&powerwell_lock); + WARN_ON(!hsw_power_count); + if (!--hsw_power_count + && !i915_power_well_using) + enable_power_well(power_well_device, false); + spin_unlock_irq(&powerwell_lock); +} +EXPORT_SYMBOL_GPL(i915_release_power_well); + +/* TODO: Call this when i915 module unload */ +void i915_remove_power_well(void) +{ + i915_power_well_using = false; + power_well_device = NULL; +} + +void intel_set_power_well(struct drm_device *dev, bool enable) +{ + if (!HAS_POWER_WELL(dev)) + return; + + power_well_device = dev; + spin_lock_irq(&powerwell_lock); + i915_power_well_using = enable; + if (!enable && hsw_power_count) { + DRM_DEBUG_KMS("Display audio power well busy using now\n"); + goto out; + } + + if (!i915_disable_power_well && !enable) + goto out; + + enable_power_well(dev, enable); +out: + spin_unlock_irq(&powerwell_lock); +} + /* * Starting with Haswell, we have a "Power Down Well" that can be turned off * when not needed anymore. We have 4 registers that can request the power well diff --git a/include/drm/i915_powerwell.h b/include/drm/i915_powerwell.h new file mode 100644 index 0000000..cfdc884 --- /dev/null +++ b/include/drm/i915_powerwell.h @@ -0,0 +1,36 @@ +/************************************************************************** + * + * Copyright 2013 Intel Inc. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE + * USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * + **************************************************************************/ + +#ifndef _I915_POWERWELL_H_ +#define _I915_POWERWELL_H_ + +/* For use by hda_i915 driver */ +extern void i915_request_power_well(void); +extern void i915_release_power_well(void); + +#endif /* _I915_POWERWELL_H_ */

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.

Signed-off-by: Wang Xingchao xingchao.wang@linux.intel.com --- sound/pci/hda/Kconfig | 10 ++++++ sound/pci/hda/Makefile | 3 ++ sound/pci/hda/hda_i915.c | 75 +++++++++++++++++++++++++++++++++++++++++++++ sound/pci/hda/hda_i915.h | 35 +++++++++++++++++++++ sound/pci/hda/hda_intel.c | 41 +++++++++++++++++++++++-- 5 files changed, 161 insertions(+), 3 deletions(-) create mode 100644 sound/pci/hda/hda_i915.c create mode 100644 sound/pci/hda/hda_i915.h

diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig index 80a7d44..c5a872c 100644 --- a/sound/pci/hda/Kconfig +++ b/sound/pci/hda/Kconfig @@ -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 diff --git a/sound/pci/hda/Makefile b/sound/pci/hda/Makefile index 24a2514..4b0a4bc 100644 --- a/sound/pci/hda/Makefile +++ b/sound/pci/hda/Makefile @@ -6,6 +6,9 @@ snd-hda-codec-$(CONFIG_PROC_FS) += hda_proc.o snd-hda-codec-$(CONFIG_SND_HDA_HWDEP) += hda_hwdep.o snd-hda-codec-$(CONFIG_SND_HDA_INPUT_BEEP) += hda_beep.o

+# for haswell power well +snd-hda-intel-$(CONFIG_SND_HDA_I915) += hda_i915.o + # for trace-points CFLAGS_hda_codec.o := -I$(src) CFLAGS_hda_intel.o := -I$(src) diff --git a/sound/pci/hda/hda_i915.c b/sound/pci/hda/hda_i915.c new file mode 100644 index 0000000..76c13d5 --- /dev/null +++ b/sound/pci/hda/hda_i915.c @@ -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; +} diff --git a/sound/pci/hda/hda_i915.h b/sound/pci/hda/hda_i915.h new file mode 100644 index 0000000..4b89dfc --- /dev/null +++ b/sound/pci/hda/hda_i915.h @@ -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 diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 418bfc0..bf27693 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -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; @@ -594,6 +595,7 @@ 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 \ @@ -2869,6 +2871,8 @@ 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; }

@@ -2881,6 +2885,8 @@ 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) { @@ -2913,6 +2919,8 @@ 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; }

@@ -2921,6 +2929,8 @@ 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; @@ -3144,6 +3154,10 @@ 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; @@ -3700,6 +3714,19 @@ static int azx_probe(struct pci_dev *pci, chip->disabled = true; }

+ if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) { +#ifdef CONFIG_SND_HDA_I915 + 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); +#else + snd_printk(KERN_ERR SFX "Haswell must build in CONFIG_SND_HDA_I915\n"); +#endif + } + probe_now = !chip->disabled; if (probe_now) { err = azx_first_init(chip); @@ -3799,6 +3826,7 @@ out_free: static void azx_remove(struct pci_dev *pci) { struct snd_card *card = pci_get_drvdata(pci); + struct azx *chip = card->private_data;

if (pci_dev_run_wake(pci)) pm_runtime_get_noresume(&pci->dev); @@ -3806,6 +3834,10 @@ static void azx_remove(struct pci_dev *pci) if (card) snd_card_free(card); pci_set_drvdata(pci, NULL); + if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) { + hda_display_power(false); + hda_i915_exit(); + } }

/* PCI IDs */ @@ -3835,11 +3867,14 @@ 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 },