5 files changed, 179 insertions, 3 deletions

diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig
index 80a7d44bcf81..c5a872ca7703 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 24a251497a1f..c091438286a3 100644
--- a/sound/pci/hda/Makefile
+++ b/sound/pci/hda/Makefile
@@ -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
diff --git a/sound/pci/hda/hda_i915.c b/sound/pci/hda/hda_i915.c
new file mode 100644
index 000000000000..76c13d5b3ca0
--- /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 000000000000..5a63da2c53e5
--- /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 3e3126ba8276..35e9f8b010a7 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;
@@ -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 },