89 lines
3.1 KiB
Diff
89 lines
3.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Kai Vehmanen <kai.vehmanen@linux.intel.com>
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Date: Fri, 20 Sep 2019 11:39:18 +0300
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Subject: [PATCH] drm/i915: save AUD_FREQ_CNTRL state at audio domain suspend
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commit 87c1694533c947bf950251df3da04a32a05ede64 upstream
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When audio power domain is suspended, the display driver must
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save state of AUD_FREQ_CNTRL on Tiger Lake and Ice Lake
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systems. The initial value of the register is set by BIOS and
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is read by driver during the audio component init sequence.
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Cc: Jani Nikula <jani.nikula@intel.com>
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Cc: Imre Deak <imre.deak@intel.com>
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Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
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Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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Link: https://patchwork.freedesktop.org/patch/msgid/20190920083918.27057-1-kai.vehmanen@linux.intel.com
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---
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drivers/gpu/drm/i915/display/intel_audio.c | 17 +++++++++++++++--
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drivers/gpu/drm/i915/i915_drv.h | 1 +
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drivers/gpu/drm/i915/i915_reg.h | 2 ++
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3 files changed, 18 insertions(+), 2 deletions(-)
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diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c
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index aac089c79ceb..54638d99e021 100644
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--- a/drivers/gpu/drm/i915/display/intel_audio.c
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+++ b/drivers/gpu/drm/i915/display/intel_audio.c
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@@ -852,10 +852,17 @@ static unsigned long i915_audio_component_get_power(struct device *kdev)
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ret = intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
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- /* Force CDCLK to 2*BCLK as long as we need audio to be powered. */
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- if (dev_priv->audio_power_refcount++ == 0)
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+ if (dev_priv->audio_power_refcount++ == 0) {
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+ if (IS_TIGERLAKE(dev_priv) || IS_ICELAKE(dev_priv)) {
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+ I915_WRITE(AUD_FREQ_CNTRL, dev_priv->audio_freq_cntrl);
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+ DRM_DEBUG_KMS("restored AUD_FREQ_CNTRL to 0x%x\n",
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+ dev_priv->audio_freq_cntrl);
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+ }
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+
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+ /* Force CDCLK to 2*BCLK as long as we need audio powered. */
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if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
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glk_force_audio_cdclk(dev_priv, true);
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+ }
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return ret;
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}
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@@ -1116,6 +1123,12 @@ static void i915_audio_component_init(struct drm_i915_private *dev_priv)
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return;
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}
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+ if (IS_TIGERLAKE(dev_priv) || IS_ICELAKE(dev_priv)) {
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+ dev_priv->audio_freq_cntrl = I915_READ(AUD_FREQ_CNTRL);
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+ DRM_DEBUG_KMS("init value of AUD_FREQ_CNTRL of 0x%x\n",
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+ dev_priv->audio_freq_cntrl);
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+ }
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+
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dev_priv->audio_component_registered = true;
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}
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diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
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index 07f1e89a55ca..fcf7423075ef 100644
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--- a/drivers/gpu/drm/i915/i915_drv.h
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+++ b/drivers/gpu/drm/i915/i915_drv.h
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@@ -1541,6 +1541,7 @@ struct drm_i915_private {
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*/
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struct mutex av_mutex;
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int audio_power_refcount;
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+ u32 audio_freq_cntrl;
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struct {
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struct mutex mutex;
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diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
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index 8649a3028963..6ecb64c042ef 100644
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--- a/drivers/gpu/drm/i915/i915_reg.h
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+++ b/drivers/gpu/drm/i915/i915_reg.h
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@@ -9127,6 +9127,8 @@ enum {
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#define HSW_AUD_CHICKENBIT _MMIO(0x65f10)
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#define SKL_AUD_CODEC_WAKE_SIGNAL (1 << 15)
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+#define AUD_FREQ_CNTRL _MMIO(0x65900)
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+
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/*
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* HSW - ICL power wells
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*
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--
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https://clearlinux.org
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