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drm/i915: save AUD_FREQ_CNTRL state at audio domain suspend 

When audio power domain is suspended, the display driver must
save state of AUD_FREQ_CNTRL on Tiger Lake and Ice Lake
systems. The initial value of the register is set by BIOS and
is read by driver during the audio component init sequence.

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190920083918.27057-1-kai.vehmanen@linux.intel.com
This commit is contained in:
Kai Vehmanen 2019-09-20 11:39:18 +03:00 committed by Jani Nikula
parent 5dd85e72bc
commit 87c1694533
3 changed files with 18 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpu/drm/i915/display/intel_audio.c
View File

@ -852,10 +852,17 @@ static unsigned long i915_audio_component_get_power(struct device *kdev)
ret = intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
/* Force CDCLK to 2*BCLK as long as we need audio to be powered. */
if (dev_priv->audio_power_refcount++ == 0)
if (dev_priv->audio_power_refcount++ == 0) {
if (IS_TIGERLAKE(dev_priv) || IS_ICELAKE(dev_priv)) {
I915_WRITE(AUD_FREQ_CNTRL, dev_priv->audio_freq_cntrl);
DRM_DEBUG_KMS("restored AUD_FREQ_CNTRL to 0x%x\n",
dev_priv->audio_freq_cntrl);
}
/* Force CDCLK to 2*BCLK as long as we need audio powered. */
if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
glk_force_audio_cdclk(dev_priv, true);
}
return ret;
}
@ -1116,6 +1123,12 @@ static void i915_audio_component_init(struct drm_i915_private *dev_priv)
return;
}
if (IS_TIGERLAKE(dev_priv) || IS_ICELAKE(dev_priv)) {
dev_priv->audio_freq_cntrl = I915_READ(AUD_FREQ_CNTRL);
DRM_DEBUG_KMS("init value of AUD_FREQ_CNTRL of 0x%x\n",
dev_priv->audio_freq_cntrl);
}
dev_priv->audio_component_registered = true;
}

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1541,6 +1541,7 @@ struct drm_i915_private {
*/
struct mutex av_mutex;
int audio_power_refcount;
u32 audio_freq_cntrl;
struct {
struct mutex mutex;

2
drivers/gpu/drm/i915/i915_reg.h
View File

@ -9127,6 +9127,8 @@ enum {
#define HSW_AUD_CHICKENBIT _MMIO(0x65f10)
#define SKL_AUD_CODEC_WAKE_SIGNAL (1 << 15)
#define AUD_FREQ_CNTRL _MMIO(0x65900)
/*
* HSW - ICL power wells
*