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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>
This commit is contained in:
Chris Wilson 2010-09-23 11:16:49 +01:00
parent 29e1316ab1
commit 428d2e828c
1 changed files with 21 additions and 0 deletions
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21
drivers/gpu/drm/i915/intel_lvds.c
View File

@ -810,6 +810,22 @@ static bool lvds_is_present_in_vbt(struct drm_device *dev)
return false;
}
static bool intel_lvds_ddc_probe(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u8 buf = 0;
struct i2c_msg msgs[] = {
{
.addr = 0xA0,
.flags = 0,
.len = 1,
.buf = &buf,
},
};
struct i2c_adapter *i2c = &dev_priv->gmbus[GMBUS_PORT_PANEL].adapter;
return i2c_transfer(i2c, msgs, 1) == 1;
}
/**
* intel_lvds_init - setup LVDS connectors on this device
* @dev: drm device
@ -849,6 +865,11 @@ void intel_lvds_init(struct drm_device *dev)
gpio = PCH_GPIOC;
}
if (!intel_lvds_ddc_probe(dev)) {
DRM_DEBUG_KMS("LVDS did not respond to DDC probe\n");
return;
}
intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
if (!intel_lvds) {
return;