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drm/i915: Allow HDMI+HDMI cloning on g4x

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BSpec is a bit unclear whether HDMI+HDMI cloning should work on g4x.
Tests on real hardware say that it does. Since g4x can't send
infoframes to more than one HDMI port anyway, we don't lose anything
by allow it.

For PCH platforms BSpec explicitly forbids HDMI+HDMI cloning.

Whether HDMI+HDMI cloning might also work on VLV is a bit unclear, but
since we'd at least lose the capability of sending infoframes to more
than one cloned HDMI port, it doesn't seem like a good idea to allow it.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=73850
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-03-03 16:15:31 +02:00 committed by Daniel Vetter
parent 301ea74a57
commit c6f1495d4c
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/i915/intel_hdmi.c
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@ -1344,6 +1344,13 @@ void intel_hdmi_init(struct drm_device *dev, int hdmi_reg, enum port port)
intel_encoder->type = INTEL_OUTPUT_HDMI;
intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
intel_encoder->cloneable = 1 << INTEL_OUTPUT_ANALOG;
/*
* BSpec is unclear about HDMI+HDMI cloning on g4x, but it seems
* to work on real hardware. And since g4x can send infoframes to
* only one port anyway, nothing is lost by allowing it.
*/
if (IS_G4X(dev))
intel_encoder->cloneable |= 1 << INTEL_OUTPUT_HDMI;
intel_dig_port->port = port;
intel_dig_port->hdmi.hdmi_reg = hdmi_reg;