From: Ville Syrjälä Date: Tue, 4 Jun 2019 20:09:32 +0000 (+0300) Subject: drm/i915: Assert that HSW/BDW LCPLL is using the non-SSC reference X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d1707a96b11787c7b9ca11fd93d235d6eb6ccbf1;p=openwrt%2Fstaging%2Fblogic.git drm/i915: Assert that HSW/BDW LCPLL is using the non-SSC reference Only the non-SSC reference is truly supported for the LCPLL. Assert that it is indeed selected. Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20190604200933.29417-4-ville.syrjala@linux.intel.com Reviewed-by: Maarten Lankhorst --- 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)