From c149dcb5c60bfea8871f16dfcc0690255eeb825f Mon Sep 17 00:00:00 2001 From: Jani Nikula Date: Fri, 4 Jul 2014 10:00:37 +0800 Subject: [PATCH] drm/i915: provide interface for audio driver to query cdclk 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 Reviewed-by: Damien Lespiau Signed-off-by: Mengdong Lin Cc: Signed-off-by: Takashi Iwai --- drivers/gpu/drm/i915/intel_pm.c | 21 +++++++++++++++++++++ include/drm/i915_powerwell.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 6463f0201cf2..409d62676854 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -6053,6 +6053,27 @@ 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 2baba9996094..baa6f11b1837 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_ */ -- 2.20.1