On Tue, Mar 25, 2014 at 2:44 AM, Stéphane Marchesin
marc...@chromium.org wrote:
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
Is
commit 6375b768a9850b6154478993e5fb566fa4614a9c
Author: Ville Syrjälä ville.syrj...@linux.intel.com
Date: Mon Mar 3 11:33:36 2014 +0200
drm/i915: Reject 165MHz modes w/ DVI monitors
not working for you?
-Daniel
---
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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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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