[PATCH] [Trusty] drm/i915: provide interface for audio driver to query cdclk

Robert Hooker sarvatt at ubuntu.com
Tue Oct 14 18:09:39 UTC 2014


From: Jani Nikula <jani.nikula at 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 at intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau at intel.com>
Signed-off-by: Mengdong Lin <mengdong.lin at intel.com>
Cc: <stable at vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
(backported from commit c149dcb5c60bfea8871f16dfcc0690255eeb825f)
BugLink: http://bugs.launchpad.net/bugs/1381168
Signed-off-by: David Henningsson <david.henningsson at canonical.com>
---
 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 1218c44..7b6bf30 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5882,6 +5882,27 @@ void 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);
+
+
 int intel_power_domains_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
diff --git a/include/drm/i915_powerwell.h b/include/drm/i915_powerwell.h
index cfdc884..d715ca1 100644
--- a/include/drm/i915_powerwell.h
+++ b/include/drm/i915_powerwell.h
@@ -32,5 +32,6 @@
 /* For use by hda_i915 driver */
 extern void i915_request_power_well(void);
 extern void i915_release_power_well(void);
+extern int i915_get_cdclk_freq(void);
 
 #endif				/* _I915_POWERWELL_H_ */
-- 
1.9.1





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