diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2014-07-04 10:00:37 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-09 11:21:26 -0700 |
| commit | 8143820319a5e7d617c122c70b58e1fdbd1b2c6e (patch) | |
| tree | 1c82471c809fbf06906fd4ee344b38d1a10d009a /include | |
| parent | 6fe5d7d9b99de2b295cfc81b91c5abd279b9be2e (diff) | |
drm/i915: provide interface for audio driver to query cdclk
commit c149dcb5c60bfea8871f16dfcc0690255eeb825f upstream.
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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/drm/i915_powerwell.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/drm/i915_powerwell.h b/include/drm/i915_powerwell.h index 2baba999609..baa6f11b183 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_ */ |