drm/i915/lvds: Probe DDC on creation
Try to validate the panel's connection by writing to address 0xA0. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=18072 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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@ -810,6 +810,22 @@ static bool lvds_is_present_in_vbt(struct drm_device *dev)
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return false;
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}
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static bool intel_lvds_ddc_probe(struct drm_device *dev)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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u8 buf = 0;
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struct i2c_msg msgs[] = {
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{
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.addr = 0xA0,
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.flags = 0,
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.len = 1,
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.buf = &buf,
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},
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};
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struct i2c_adapter *i2c = &dev_priv->gmbus[GMBUS_PORT_PANEL].adapter;
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return i2c_transfer(i2c, msgs, 1) == 1;
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}
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/**
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* intel_lvds_init - setup LVDS connectors on this device
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* @dev: drm device
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@ -849,6 +865,11 @@ void intel_lvds_init(struct drm_device *dev)
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gpio = PCH_GPIOC;
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}
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if (!intel_lvds_ddc_probe(dev)) {
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DRM_DEBUG_KMS("LVDS did not respond to DDC probe\n");
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return;
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}
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intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
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if (!intel_lvds) {
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return;
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