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Commit 1b2db4ce authored by Alan Cox's avatar Alan Cox Committed by Dave Airlie
Browse files

gma500: panel presence check 



Introduce a panel presence check for Cedartrail. Non netbook devices don't
necessarily have a panel attached.

Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 1fb28e9e

drivers/gpu/drm/gma500/cdv_intel_lvds.c

+57 −0
Original line number Original line Diff line number Diff line
@@ -556,6 +556,56 @@ const struct drm_encoder_funcs cdv_intel_lvds_enc_funcs = { 
	.destroy = cdv_intel_lvds_enc_destroy,

	.destroy = cdv_intel_lvds_enc_destroy,

};

};





/*

 * Enumerate the child dev array parsed from VBT to check whether

 * the LVDS is present.

 * If it is present, return 1.

 * If it is not present, return false.

 * If no child dev is parsed from VBT, it assumes that the LVDS is present.

 */

static bool lvds_is_present_in_vbt(struct drm_device *dev,

				   u8 *i2c_pin)

{

	struct drm_psb_private *dev_priv = dev->dev_private;

	int i;



	if (!dev_priv->child_dev_num)

		return true;



	for (i = 0; i < dev_priv->child_dev_num; i++) {

		struct child_device_config *child = dev_priv->child_dev + i;



		/* If the device type is not LFP, continue.

		 * We have to check both the new identifiers as well as the

		 * old for compatibility with some BIOSes.

		 */

		if (child->device_type != DEVICE_TYPE_INT_LFP &&

		    child->device_type != DEVICE_TYPE_LFP)

			continue;



		if (child->i2c_pin)

		    *i2c_pin = child->i2c_pin;



		/* However, we cannot trust the BIOS writers to populate

		 * the VBT correctly.  Since LVDS requires additional

		 * information from AIM blocks, a non-zero addin offset is

		 * a good indicator that the LVDS is actually present.

		 */

		if (child->addin_offset)

			return true;



		/* But even then some BIOS writers perform some black magic

		 * and instantiate the device without reference to any

		 * additional data.  Trust that if the VBT was written into

		 * the OpRegion then they have validated the LVDS's existence.

		 */

		if (dev_priv->opregion.vbt)

			return true;

	}



	return false;

}



/**

/**

 * cdv_intel_lvds_init - setup LVDS connectors on this device

 * cdv_intel_lvds_init - setup LVDS connectors on this device

 * @dev: drm device

 * @dev: drm device
@@ -576,6 +626,13 @@ void cdv_intel_lvds_init(struct drm_device *dev, 
	struct drm_psb_private *dev_priv = dev->dev_private;

	struct drm_psb_private *dev_priv = dev->dev_private;

	u32 lvds;

	u32 lvds;

	int pipe;

	int pipe;

	u8 pin;



	pin = GMBUS_PORT_PANEL;

	if (!lvds_is_present_in_vbt(dev, &pin)) {

		DRM_DEBUG_KMS("LVDS is not present in VBT\n");

		return;

	}





	psb_intel_encoder = kzalloc(sizeof(struct psb_intel_encoder),

	psb_intel_encoder = kzalloc(sizeof(struct psb_intel_encoder),

				    GFP_KERNEL);

				    GFP_KERNEL);