diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dpll_mgr.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dpll_mgr.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c index 04d41bc1a4bb..e6cac9225536 100644 --- a/drivers/gpu/drm/i915/intel_dpll_mgr.c +++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c @@ -2212,6 +2212,20 @@ static void cnl_wrpll_params_populate(struct skl_wrpll_params *params, params->dco_fraction = dco & 0x7fff; } +int cnl_hdmi_pll_ref_clock(struct drm_i915_private *dev_priv) +{ + int ref_clock = dev_priv->cdclk.hw.ref; + + /* + * For ICL+, the spec states: if reference frequency is 38.4, + * use 19.2 because the DPLL automatically divides that by 2. + */ + if (INTEL_GEN(dev_priv) >= 11 && ref_clock == 38400) + ref_clock = 19200; + + return ref_clock; +} + static bool cnl_ddi_calculate_wrpll(int clock, struct drm_i915_private *dev_priv, @@ -2251,14 +2265,7 @@ cnl_ddi_calculate_wrpll(int clock, cnl_wrpll_get_multipliers(best_div, &pdiv, &qdiv, &kdiv); - ref_clock = dev_priv->cdclk.hw.ref; - - /* - * For ICL, the spec states: if reference frequency is 38.4, use 19.2 - * because the DPLL automatically divides that by 2. - */ - if (IS_ICELAKE(dev_priv) && ref_clock == 38400) - ref_clock = 19200; + ref_clock = cnl_hdmi_pll_ref_clock(dev_priv); cnl_wrpll_params_populate(wrpll_params, best_dco, ref_clock, pdiv, qdiv, kdiv); |