drm/i915: Store cdclk PLL reference clock under dev_priv

Future platforms will have multiple options for the cdclk PLL reference
clock, so let's start tracking that under dev_priv alreday on SKL,
although on SKL it's always 24 MHz.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1463172100-24715-15-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

2 files changed, 9 insertions, 7 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f8d8a8119b7c..78d38c246491 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1823,7 +1823,7 @@ struct drm_i915_private {
         unsigned int czclk_freq;
 
         struct {
-                unsigned int vco;
+                unsigned int vco, ref;
         } cdclk_pll;
 
         /**
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 40893c0cd960..57771639b94e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5255,8 +5255,9 @@ static void intel_update_cdclk(struct drm_device *dev)
         dev_priv->cdclk_freq = dev_priv->display.get_display_clock_speed(dev);
 
         if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
-                DRM_DEBUG_DRIVER("Current CD clock rate: %d kHz, VCO: %d kHz\n",
-                                 dev_priv->cdclk_freq, dev_priv->cdclk_pll.vco);
+                DRM_DEBUG_DRIVER("Current CD clock rate: %d kHz, VCO: %d kHz, ref: %d kHz\n",
+                                 dev_priv->cdclk_freq, dev_priv->cdclk_pll.vco,
+                                 dev_priv->cdclk_pll.ref);
         else
                 DRM_DEBUG_DRIVER("Current CD clock rate: %d kHz\n",
                                  dev_priv->cdclk_freq);
@@ -5462,6 +5463,8 @@ skl_dpll0_update(struct drm_i915_private *dev_priv)
 {
         u32 val;
 
+        dev_priv->cdclk_pll.ref = 24000;
+
         val = I915_READ(LCPLL1_CTL);
         if ((val & LCPLL_PLL_ENABLE) == 0) {
                 dev_priv->cdclk_pll.vco = 0;
@@ -5650,7 +5653,7 @@ static void skl_sanitize_cdclk(struct drm_i915_private *dev_priv);
 
 void skl_uninit_cdclk(struct drm_i915_private *dev_priv)
 {
-        skl_set_cdclk(dev_priv, 24000, 0);
+        skl_set_cdclk(dev_priv, dev_priv->cdclk_pll.ref, 0);
 }
 
 void skl_init_cdclk(struct drm_i915_private *dev_priv)
@@ -6572,7 +6575,7 @@ static int skylake_get_display_clock_speed(struct drm_device *dev)
         skl_dpll0_update(dev_priv);
 
         if (dev_priv->cdclk_pll.vco == 0)
-                return 24000; /* 24MHz is the cd freq with NSSC ref */
+                return dev_priv->cdclk_pll.ref;
 
         cdctl = I915_READ(CDCLK_CTL);
 
@@ -6604,8 +6607,7 @@ static int skylake_get_display_clock_speed(struct drm_device *dev)
                 }
         }
 
-        /* error case, do as if DPLL0 isn't enabled */
-        return 24000;
+        return dev_priv->cdclk_pll.ref;
 }
 
 static int broxton_get_display_clock_speed(struct drm_device *dev)