From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> The BXT/GLK DPLL can't generate certain frequencies. We already reject the 233-240MHz range on both. But on GLK the DPLL max frequency was bumped from 300MHz to 594MHz, so now we get to also worry about the 446-480MHz range (double the original problem range). Reject any frequency within the higher problematic range as well. Cc: stable@xxxxxxxxxxxxxxx Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/3000 Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_hdmi.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c index 66e1ac3887c6..b593a71e6517 100644 --- a/drivers/gpu/drm/i915/display/intel_hdmi.c +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c @@ -2218,7 +2218,11 @@ hdmi_port_clock_valid(struct intel_hdmi *hdmi, has_hdmi_sink)) return MODE_CLOCK_HIGH; - /* BXT DPLL can't generate 223-240 MHz */ + /* GLK DPLL can't generate 446-480 MHz */ + if (IS_GEMINILAKE(dev_priv) && clock > 446666 && clock < 480000) + return MODE_CLOCK_RANGE; + + /* BXT/GLK DPLL can't generate 223-240 MHz */ if (IS_GEN9_LP(dev_priv) && clock > 223333 && clock < 240000) return MODE_CLOCK_RANGE; -- 2.26.2
