drm/i915: Limit audio CDCLK>=2*BCLK constraint back to GLK only

Revert changes done in commit f6ec9483091f ("drm/i915: extend audio
CDCLK>=2*BCLK constraint to more platforms"). Audio drivers
communicate with i915 over HDA bus multiple times during system
boot-up and each of these transactions result in matching
get_power/put_power calls to i915, and depending on the platform,
a modeset change causing visible flicker.

GLK is the only platform with minimum CDCLK significantly lower
than BCLK, and thus for GLK setting a higher CDCLK is mandatory.

For other platforms, minimum CDCLK is close but below 2*BCLK
(e.g. on ICL, CDCLK=176.4kHz with BCLK=96kHz). Spec-wise the constraint
should be set, but in practise no communication errors have been
reported and the downside if set is the flicker observed at boot-time.

Revert to old behaviour until better mechanism to manage
probe-time clocks is available.

The full CDCLK>=2*BCLK constraint is still enforced at pipe
enable time in intel_crtc_compute_min_cdclk().

Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/913
Fixes: f6ec9483091f ("drm/i915: extend audio CDCLK>=2*BCLK constraint to more platforms")
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191231140007.31728-1-kai.vehmanen@linux.intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c
index 2771009..e406719 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_audio.c
+++ b/drivers/gpu/drm/i915/display/intel_audio.c
@@ -856,7 +856,7 @@ static unsigned long i915_audio_component_get_power(struct device *kdev)
                }
 
                /* Force CDCLK to 2*BCLK as long as we need audio powered. */
-               if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
+               if (IS_GEMINILAKE(dev_priv))
                        glk_force_audio_cdclk(dev_priv, true);
 
                if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
@@ -875,7 +875,7 @@ static void i915_audio_component_put_power(struct device *kdev,
 
        /* Stop forcing CDCLK to 2*BCLK if no need for audio to be powered. */
        if (--dev_priv->audio_power_refcount == 0)
-               if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
+               if (IS_GEMINILAKE(dev_priv))
                        glk_force_audio_cdclk(dev_priv, false);
 
        intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO, cookie);