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ALSA: hda - reset display codec when power on

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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>
This commit is contained in:
Lu, Han 2015-05-05 09:05:48 +08:00 committed by Takashi Iwai
parent 632f3ab95f
commit 0a67352153
3 changed files with 43 additions and 3 deletions
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21
sound/pci/hda/hda_i915.c
View File

@ -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;

20
sound/pci/hda/hda_intel.c
View File

@ -491,6 +491,17 @@ static void azx_init_pci(struct azx *chip)
}
}
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 @@ static int azx_resume(struct device *dev)
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 @@ static int azx_runtime_resume(struct device *dev)
&& 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 @@ static int azx_first_init(struct azx *chip)
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) {

5
sound/pci/hda/hda_intel.h
View File

@ -51,11 +51,16 @@ struct hda_intel {
};
#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;