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 <marcheu@xxxxxxxxxxxx>
---
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
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