ALSA: hda - reset display codec when power on
In SKL, HDMI/DP codec and PCH HD Audio Controller are in different power wells,
so it's necessary to reset display audio codecs when power well on, otherwise
display audio codecs will disappear when resume from low power state.
Reset steps when power on:
enable codec wakeup -> azx_init_chip() -> disable codec wakeup
The callback for codec wakeup enable/disable is in drivers/gpu/drm/i915/.
Signed-off-by: Lu, Han <han.lu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_i915.c b/sound/pci/hda/hda_i915.c
index d9d0793..8521702 100644
--- a/sound/pci/hda/hda_i915.c
+++ b/sound/pci/hda/hda_i915.c
@@ -33,6 +33,27 @@
#define AZX_REG_EM4 0x100c
#define AZX_REG_EM5 0x1010
+int hda_set_codec_wakeup(struct hda_intel *hda, bool enable)
+{
+ struct i915_audio_component *acomp = &hda->audio_component;
+
+ if (!acomp->ops)
+ return -ENODEV;
+
+ if (!acomp->ops->codec_wake_override) {
+ dev_warn(&hda->chip.pci->dev,
+ "Invalid codec wake callback\n");
+ return 0;
+ }
+
+ dev_dbg(&hda->chip.pci->dev, "%s codec wakeup\n",
+ enable ? "enable" : "disable");
+
+ acomp->ops->codec_wake_override(acomp->dev, enable);
+
+ return 0;
+}
+
int hda_display_power(struct hda_intel *hda, bool enable)
{
struct i915_audio_component *acomp = &hda->audio_component;
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 87df90d..706879a 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -491,6 +491,17 @@
}
}
+static void hda_intel_init_chip(struct azx *chip, bool full_reset)
+{
+ struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
+
+ if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
+ hda_set_codec_wakeup(hda, true);
+ azx_init_chip(chip, full_reset);
+ if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
+ hda_set_codec_wakeup(hda, false);
+}
+
/* calculate runtime delay from LPIB */
static int azx_get_delay_from_lpib(struct azx *chip, struct azx_dev *azx_dev,
unsigned int pos)
@@ -850,7 +861,7 @@
return -EIO;
azx_init_pci(chip);
- azx_init_chip(chip, true);
+ hda_intel_init_chip(chip, true);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
@@ -912,13 +923,16 @@
&& hda->need_i915_power) {
hda_display_power(hda, true);
haswell_set_bclk(hda);
+ /* toggle codec wakeup bit for STATESTS read */
+ hda_set_codec_wakeup(hda, true);
+ hda_set_codec_wakeup(hda, false);
}
/* Read STATESTS before controller reset */
status = azx_readw(chip, STATESTS);
azx_init_pci(chip);
- azx_init_chip(chip, true);
+ hda_intel_init_chip(chip, true);
if (status) {
list_for_each_codec(codec, &chip->bus)
@@ -1629,7 +1643,7 @@
haswell_set_bclk(hda);
}
- azx_init_chip(chip, (probe_only[dev] & 2) == 0);
+ hda_intel_init_chip(chip, (probe_only[dev] & 2) == 0);
/* codec detection */
if (!azx_bus(chip)->codec_mask) {
diff --git a/sound/pci/hda/hda_intel.h b/sound/pci/hda/hda_intel.h
index ff41fc30..7fd3254 100644
--- a/sound/pci/hda/hda_intel.h
+++ b/sound/pci/hda/hda_intel.h
@@ -51,11 +51,16 @@
};
#ifdef CONFIG_SND_HDA_I915
+int hda_set_codec_wakeup(struct hda_intel *hda, bool enable);
int hda_display_power(struct hda_intel *hda, bool enable);
void haswell_set_bclk(struct hda_intel *hda);
int hda_i915_init(struct hda_intel *hda);
int hda_i915_exit(struct hda_intel *hda);
#else
+static inline int hda_set_codec_wakeup(struct hda_intel *hda, bool enable)
+{
+ return 0;
+}
static inline int hda_display_power(struct hda_intel *hda, bool enable)
{
return 0;