| Message ID | f65e64008cae3e776af3b6af6ca1eef0ae9aa803.1404439016.git.mengdong.lin@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
At Fri, 4 Jul 2014 10:00:37 +0800, mengdong.lin@intel.com wrote: > > From: Jani Nikula <jani.nikula@intel.com> > > For Haswell and Broadwell, if the display power well has been disabled, > the display audio controller divider values EM4 M VALUE and EM5 N VALUE > will have been lost. The CDCLK frequency is required for reprogramming them > to generate 24MHz HD-A link BCLK. So provide a private interface for the > audio driver to query CDCLK. > > This is a stopgap solution until a more generic interface between audio > and display drivers has been implemented. > > Signed-off-by: Jani Nikula <jani.nikula@intel.com> > Reviewed-by: Damien Lespiau <damien.lespiau@intel.com> > Signed-off-by: Mengdong Lin <mengdong.lin@intel.com> Thanks, applied (with Cc to stable). Takashi > > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > index a90fdbd..21170e5 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -6256,6 +6256,27 @@ int i915_release_power_well(void) > } > EXPORT_SYMBOL_GPL(i915_release_power_well); > > +/* > + * Private interface for the audio driver to get CDCLK in kHz. > + * > + * Caller must request power well using i915_request_power_well() prior to > + * making the call. > + */ > +int i915_get_cdclk_freq(void) > +{ > + struct drm_i915_private *dev_priv; > + > + if (!hsw_pwr) > + return -ENODEV; > + > + dev_priv = container_of(hsw_pwr, struct drm_i915_private, > + power_domains); > + > + return intel_ddi_get_cdclk_freq(dev_priv); > +} > +EXPORT_SYMBOL_GPL(i915_get_cdclk_freq); > + > + > #define POWER_DOMAIN_MASK (BIT(POWER_DOMAIN_NUM) - 1) > > #define HSW_ALWAYS_ON_POWER_DOMAINS ( \ > diff --git a/include/drm/i915_powerwell.h b/include/drm/i915_powerwell.h > index 2baba99..baa6f11 100644 > --- a/include/drm/i915_powerwell.h > +++ b/include/drm/i915_powerwell.h > @@ -32,5 +32,6 @@ > /* For use by hda_i915 driver */ > extern int i915_request_power_well(void); > extern int i915_release_power_well(void); > +extern int i915_get_cdclk_freq(void); > > #endif /* _I915_POWERWELL_H_ */ > -- > 1.8.1.2 >
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index a90fdbd..21170e5 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -6256,6 +6256,27 @@ int i915_release_power_well(void) } EXPORT_SYMBOL_GPL(i915_release_power_well); +/* + * Private interface for the audio driver to get CDCLK in kHz. + * + * Caller must request power well using i915_request_power_well() prior to + * making the call. + */ +int i915_get_cdclk_freq(void) +{ + struct drm_i915_private *dev_priv; + + if (!hsw_pwr) + return -ENODEV; + + dev_priv = container_of(hsw_pwr, struct drm_i915_private, + power_domains); + + return intel_ddi_get_cdclk_freq(dev_priv); +} +EXPORT_SYMBOL_GPL(i915_get_cdclk_freq); + + #define POWER_DOMAIN_MASK (BIT(POWER_DOMAIN_NUM) - 1) #define HSW_ALWAYS_ON_POWER_DOMAINS ( \ diff --git a/include/drm/i915_powerwell.h b/include/drm/i915_powerwell.h index 2baba99..baa6f11 100644 --- a/include/drm/i915_powerwell.h +++ b/include/drm/i915_powerwell.h @@ -32,5 +32,6 @@ /* For use by hda_i915 driver */ extern int i915_request_power_well(void); extern int i915_release_power_well(void); +extern int i915_get_cdclk_freq(void); #endif /* _I915_POWERWELL_H_ */