diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dpll_mgr.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c index 19efdd3..0bde6a4 100644 --- a/drivers/gpu/drm/i915/intel_dpll_mgr.c +++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c @@ -1296,7 +1296,15 @@ static void bxt_ddi_pll_enable(struct drm_i915_private *dev_priv, enum port port = (enum port)pll->id; /* 1:1 port->PLL mapping */ temp = I915_READ(BXT_PORT_PLL_ENABLE(port)); - temp &= ~PORT_PLL_REF_SEL; + /* + * Definition of each bit polarity has been changed + * after A1 stepping + */ + if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1)) + temp &= ~PORT_PLL_REF_SEL; + else + temp |= PORT_PLL_REF_SEL; + /* Non-SSC reference */ I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp); |
