drm/i915: Store max dotclock
Store max dotclock into dev_priv structure so we are able
to filter out the modes that are not supported by our
platforms.
V2:
- limit the max dot clock frequency to max CD clock frequency
for the gen9 and above
- limit the max dot clock frequency to 90% of the max CD clock
frequency for the older gens
- for Cherryview the max dot clock frequency is limited to 95%
of the max CD clock frequency
- for gen2 and gen3 the max dot clock limit is set to 90% of the
2X max CD clock frequency
V3:
- max_dotclk variable renamed as max_dotclk_freq in i915_drv.h
- in intel_compute_max_dotclk() the rounding method changed from
round up to round down when computing max dotclock
V4:
- Haswell and Broadwell supports now dot clocks up to max CD clock
frequency
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 50cbc7e..03e84ac 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5240,6 +5240,21 @@
modeset_put_power_domains(dev_priv, put_domains[i]);
}
+static int intel_compute_max_dotclk(struct drm_i915_private *dev_priv)
+{
+ int max_cdclk_freq = dev_priv->max_cdclk_freq;
+
+ if (INTEL_INFO(dev_priv)->gen >= 9 ||
+ IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+ return max_cdclk_freq;
+ else if (IS_CHERRYVIEW(dev_priv))
+ return max_cdclk_freq*95/100;
+ else if (INTEL_INFO(dev_priv)->gen < 4)
+ return 2*max_cdclk_freq*90/100;
+ else
+ return max_cdclk_freq*90/100;
+}
+
static void intel_update_max_cdclk(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -5279,8 +5294,13 @@
dev_priv->max_cdclk_freq = dev_priv->cdclk_freq;
}
+ dev_priv->max_dotclk_freq = intel_compute_max_dotclk(dev_priv);
+
DRM_DEBUG_DRIVER("Max CD clock rate: %d kHz\n",
dev_priv->max_cdclk_freq);
+
+ DRM_DEBUG_DRIVER("Max dotclock rate: %d kHz\n",
+ dev_priv->max_dotclk_freq);
}
static void intel_update_cdclk(struct drm_device *dev)