Commit 632f3ab9 authored by Lu, Han's avatar Lu, Han Committed by Takashi Iwai

drm/i915/audio: add codec wakeup override enabled/disable callback

Add support for enabling codec wakeup override signal to allow
re-enumeration of the controller on SKL after resume from low power state.

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

v3 by Jani: Simplify to only support toggling the appropriate chicken bit.

v4 by Han: add explanation and specify the hw swquence.
Signed-off-by: default avatarLu, Han <han.lu@intel.com>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Acked-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent bd5b2d44
......@@ -6477,6 +6477,9 @@ enum skl_disp_power_wells {
#define AUDIO_CP_READY(trans) ((1 << 1) << ((trans) * 4))
#define AUDIO_ELD_VALID(trans) ((1 << 0) << ((trans) * 4))
#define HSW_AUD_CHICKENBIT 0x65f10
#define SKL_AUD_CODEC_WAKE_SIGNAL (1 << 15)
/* HSW Power Wells */
#define HSW_PWR_WELL_BIOS 0x45400 /* CTL1 */
#define HSW_PWR_WELL_DRIVER 0x45404 /* CTL2 */
......
......@@ -475,6 +475,32 @@ static void i915_audio_component_put_power(struct device *dev)
intel_display_power_put(dev_to_i915(dev), POWER_DOMAIN_AUDIO);
}
static void i915_audio_component_codec_wake_override(struct device *dev,
bool enable)
{
struct drm_i915_private *dev_priv = dev_to_i915(dev);
u32 tmp;
if (!IS_SKYLAKE(dev_priv))
return;
/*
* Enable/disable generating the codec wake signal, overriding the
* internal logic to generate the codec wake to controller.
*/
tmp = I915_READ(HSW_AUD_CHICKENBIT);
tmp &= ~SKL_AUD_CODEC_WAKE_SIGNAL;
I915_WRITE(HSW_AUD_CHICKENBIT, tmp);
usleep_range(1000, 1500);
if (enable) {
tmp = I915_READ(HSW_AUD_CHICKENBIT);
tmp |= SKL_AUD_CODEC_WAKE_SIGNAL;
I915_WRITE(HSW_AUD_CHICKENBIT, tmp);
usleep_range(1000, 1500);
}
}
/* Get CDCLK in kHz */
static int i915_audio_component_get_cdclk_freq(struct device *dev)
{
......@@ -495,6 +521,7 @@ static const struct i915_audio_component_ops i915_audio_component_ops = {
.owner = THIS_MODULE,
.get_power = i915_audio_component_get_power,
.put_power = i915_audio_component_put_power,
.codec_wake_override = i915_audio_component_codec_wake_override,
.get_cdclk_freq = i915_audio_component_get_cdclk_freq,
};
......
......@@ -31,6 +31,7 @@ struct i915_audio_component {
struct module *owner;
void (*get_power)(struct device *);
void (*put_power)(struct device *);
void (*codec_wake_override)(struct device *, bool enable);
int (*get_cdclk_freq)(struct device *);
} *ops;
};
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment