[Intel-gfx] [PATCH v2 01/11] drm/i915: Store max dotclock

[Mika Kahola]

Store max dotclock into dev_priv structure so we are able
to filter out the modes that are not supported by our
platforms.

Signed-off-by: Mika Kahola <mika.kahola at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |  1 +
 drivers/gpu/drm/i915/intel_display.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 04aa34a..1f69211b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1777,6 +1777,7 @@ struct drm_i915_private {
 	unsigned int fsb_freq, mem_freq, is_ddr3;
 	unsigned int skl_boot_cdclk;
 	unsigned int cdclk_freq, max_cdclk_freq;
+	unsigned int max_dotclk;
 	unsigned int hpll_freq;
 
 	/**
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 43b0f17..9031261 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5259,6 +5259,24 @@ static void modeset_update_crtc_power_domains(struct drm_atomic_state *state)
 			modeset_put_power_domains(dev_priv, put_domains[i]);
 }
 
+static int intel_update_max_dotclk(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int max_cdclk_freq = dev_priv->max_cdclk_freq;
+	int max_dotclk_freq;
+
+	if (IS_BROADWELL(dev) || IS_CHERRYVIEW(dev))
+		max_dotclk_freq = DIV_ROUND_UP(max_cdclk_freq * 100, 95);
+	else if (IS_VALLEYVIEW(dev))
+		max_dotclk_freq = DIV_ROUND_UP(max_cdclk_freq * 100, 90);
+	else if (IS_GEN2(dev) || IS_GEN3(dev))
+		max_dotclk_freq = DIV_ROUND_UP(2 * max_cdclk_freq * 100, 90);
+	else
+		max_dotclk_freq = max_cdclk_freq;
+
+	return max_dotclk_freq;
+}
+
 static void intel_update_max_cdclk(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -5298,6 +5316,8 @@ static void intel_update_max_cdclk(struct drm_device *dev)
 		dev_priv->max_cdclk_freq = dev_priv->cdclk_freq;
 	}
 
+	dev_priv->max_dotclk = intel_update_max_dotclk(dev);
+
 	DRM_DEBUG_DRIVER("Max CD clock rate: %d kHz\n",
 			 dev_priv->max_cdclk_freq);
 }
-- 
1.9.1