From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Only the non-SSC reference is truly supported for the LCPLL. Assert
that it is indeed selected.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display_power.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display_power.c b/drivers/gpu/drm/i915/intel_display_power.c
index 278a7edc94f5..bb9ef1cea5db 100644
--- a/drivers/gpu/drm/i915/intel_display_power.c
+++ b/drivers/gpu/drm/i915/intel_display_power.c
@@ -3665,6 +3665,9 @@ static void hsw_assert_cdclk(struct drm_i915_private *dev_priv)
if (val & LCPLL_PLL_DISABLE)
DRM_ERROR("LCPLL is disabled\n");
+
+ if ((val & LCPLL_REF_MASK) != LCPLL_REF_NON_SSC)
+ DRM_ERROR("LCPLL not using non-SSC reference\n");
}
static void assert_can_disable_lcpll(struct drm_i915_private *dev_priv)
--
2.21.0
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