From: Ville Syrjälä Date: Mon, 3 Mar 2014 14:15:31 +0000 (+0200) Subject: drm/i915: Allow HDMI+HDMI cloning on g4x X-Git-Tag: firefly_0821_release~176^2~3773^2~63^2~216 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c6f1495d4c20cfc48ef3527012c31b46527f3839;p=firefly-linux-kernel-4.4.55.git drm/i915: Allow HDMI+HDMI cloning on g4x 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 Reviewed-by: Rodrigo Vivi Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index 6e806c668538..b0413e190625 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -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;