drm/i915: Store BXT DE PLL vco and ref clocks in dev_priv

We have need to know the DE PLL refclk and output frequency in various
cdclk calculations, so let's store those in dev_priv.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1463172100-24715-17-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 521ad13..6382241 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5254,7 +5254,7 @@ 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))
+       if (INTEL_GEN(dev_priv) >= 9)
                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);
@@ -5285,6 +5285,8 @@ static void bxt_de_pll_disable(struct drm_i915_private *dev_priv)
        /* Timeout 200us */
        if (wait_for((I915_READ(BXT_DE_PLL_ENABLE) & BXT_DE_PLL_LOCK) == 0, 1))
                DRM_ERROR("timeout waiting for DE PLL unlock\n");
+
+       dev_priv->cdclk_pll.vco = 0;
 }
 
 static void bxt_de_pll_enable(struct drm_i915_private *dev_priv, u32 ratio)
@@ -5301,6 +5303,8 @@ static void bxt_de_pll_enable(struct drm_i915_private *dev_priv, u32 ratio)
        /* Timeout 200us */
        if (wait_for((I915_READ(BXT_DE_PLL_ENABLE) & BXT_DE_PLL_LOCK) != 0, 1))
                DRM_ERROR("timeout waiting for DE PLL lock\n");
+
+       dev_priv->cdclk_pll.vco = ratio * dev_priv->cdclk_pll.ref;
 }
 
 static void broxton_set_cdclk(struct drm_i915_private *dev_priv, int cdclk)
@@ -6623,6 +6627,25 @@ static int skylake_get_display_clock_speed(struct drm_device *dev)
        return dev_priv->cdclk_pll.ref;
 }
 
+static void bxt_de_pll_update(struct drm_i915_private *dev_priv)
+{
+       u32 val;
+
+       dev_priv->cdclk_pll.ref = 19200;
+
+       val = I915_READ(BXT_DE_PLL_ENABLE);
+       if ((val & BXT_DE_PLL_PLL_ENABLE) == 0) {
+               dev_priv->cdclk_pll.vco = 0;
+               return;
+       }
+
+       WARN_ON((val & BXT_DE_PLL_LOCK) == 0);
+
+       val = I915_READ(BXT_DE_PLL_CTL);
+       dev_priv->cdclk_pll.vco = (val & BXT_DE_PLL_RATIO_MASK) *
+               dev_priv->cdclk_pll.ref;
+}
+
 static int broxton_get_display_clock_speed(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = to_i915(dev);
@@ -6631,6 +6654,8 @@ static int broxton_get_display_clock_speed(struct drm_device *dev)
        uint32_t pll_enab = I915_READ(BXT_DE_PLL_ENABLE);
        int cdclk;
 
+       bxt_de_pll_update(dev_priv);
+
        if (!(pll_enab & BXT_DE_PLL_PLL_ENABLE))
                return 19200;