[PATCH 12/25] drm/i915: do AUD_FREQ_CNTRL state save on all gen9+ platforms

[Timo Aaltonen]

From: Kai Vehmanen <kai.vehmanen at linux.intel.com>

BugLink: https://bugs.launchpad.net/bugs/1855399

Replace the TGL/ICL specific platform checks with a more generic check
using INTEL_GEN(). Fixes bug with broken audio after S3 resume on JSL
platforms.

An initial version of state save and restore of AUD_FREQ_CNTRL register
was added for subset of platforms in commit 87c1694533c9
("drm/i915: save AUD_FREQ_CNTRL state at audio domain suspend"). The state
save has proven to work well and it is needed in newer platforms, so needs
to be extended. Although the logic is not in practise needed on GEN9/10
systems, follow the hardware specification and apply state and restore on
all gen9+ platforms.

Bspec: 49281
Link: https://github.com/thesofproject/linux/issues/1719
Signed-off-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200330144421.11632-1-kai.vehmanen@linux.intel.com
Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
(backported from commit f26f1db5d2be446324140ec096cc9a31e7e7c891)
Signed-off-by: Timo Aaltonen <timo.aaltonen at canonical.com>
---
 drivers/gpu/drm/i915/display/intel_audio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c
index fc1550f2b69a..a228b291df99 100644
--- a/drivers/gpu/drm/i915/display/intel_audio.c
+++ b/drivers/gpu/drm/i915/display/intel_audio.c
@@ -857,7 +857,7 @@ static unsigned long i915_audio_component_get_power(struct device *kdev)
 	ret = intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
 
 	if (dev_priv->audio_power_refcount++ == 0) {
-		if (IS_TIGERLAKE(dev_priv) || IS_ICELAKE(dev_priv)) {
+		if (INTEL_GEN(dev_priv) >= 9) {
 			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);
@@ -1132,7 +1132,7 @@ static void i915_audio_component_init(struct drm_i915_private *dev_priv)
 		return;
 	}
 
-	if (IS_TIGERLAKE(dev_priv) || IS_ICELAKE(dev_priv)) {
+	if (INTEL_GEN(dev_priv) >= 9) {
 		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);
-- 
2.25.1