diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ddi.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ddi.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index aa06f1bcea61..2fad62099ca5 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -1231,6 +1231,19 @@ static int hsw_ddi_calc_wrpll_link(struct drm_i915_private *dev_priv, wrpll = I915_READ(reg); switch (wrpll & WRPLL_REF_MASK) { case WRPLL_REF_SPECIAL_HSW: + /* + * muxed-SSC for BDW. + * non-SSC for non-ULT HSW. Check FUSE_STRAP3 + * for the non-SSC reference frequency. + */ + if (IS_HASWELL(dev_priv) && !IS_HSW_ULT(dev_priv)) { + if (I915_READ(FUSE_STRAP3) & HSW_REF_CLK_SELECT) + refclk = 24; + else + refclk = 135; + break; + } + /* fall through */ case WRPLL_REF_PCH_SSC: /* * We could calculate spread here, but our checking @@ -1243,7 +1256,7 @@ static int hsw_ddi_calc_wrpll_link(struct drm_i915_private *dev_priv, refclk = 2700; break; default: - WARN(1, "bad wrpll refclk\n"); + MISSING_CASE(wrpll); return 0; } |