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
Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 19 +++++++++++++++++++
2 files changed, 20 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..c9c6d19 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5259,6 +5259,23 @@ static void modeset_update_crtc_power_domains(struct drm_atomic_state *state)
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;
+ int max_dotclk_freq;
+
+ if (INTEL_INFO(dev_priv)->gen >= 9)
+ max_dotclk_freq = max_cdclk_freq;
+ else if (IS_CHERRYVIEW(dev_priv))
+ max_dotclk_freq = DIV_ROUND_UP(max_cdclk_freq * 95, 100);
+ else if (INTEL_INFO(dev_priv)->gen == 2 || INTEL_INFO(dev_priv)->gen == 3)
+ max_dotclk_freq = DIV_ROUND_UP(2 * max_cdclk_freq * 90, 100);
+ else
+ max_dotclk_freq = DIV_ROUND_UP(max_cdclk_freq * 90, 100);
+
+ 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 +5315,8 @@ static void intel_update_max_cdclk(struct drm_device *dev)
dev_priv->max_cdclk_freq = dev_priv->cdclk_freq;
}
+ dev_priv->max_dotclk = intel_compute_max_dotclk(dev_priv);
+
DRM_DEBUG_DRIVER("Max CD clock rate: %d kHz\n",
dev_priv->max_cdclk_freq);
}
--
1.9.1
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