When using HDMI, the 300MHz clock is legal, but when in DVI mode it's definitely not. This causes issues when we send a 300MHz signal over a DVI cable which is specced for 165MHz only. So when in DVI mode let's limit the clock to 165MHz.
Signed-off-by: Stéphane Marchesin <marc...@chromium.org> --- drivers/gpu/drm/i915/intel_hdmi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index dd4fa35..0ac69f1 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -806,6 +806,10 @@ static int hdmi_portclock_limit(struct intel_hdmi *hdmi) { struct drm_device *dev = intel_hdmi_to_dev(hdmi); + /* If we are in DVI mode, the limit is 165MHz */ + if (!hdmi->has_hdmi_sink) + return 165000; + if (IS_G4X(dev)) return 165000; else if (IS_HASWELL(dev)) -- 1.9.1.423.g4596e3a _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx