drm/i915: Add a module parameter to ignore lid status

Seems like we are forever to be cursed with buggy firmware, so allow the
user to explicitly set the panel connection status.

Of secondary utility for cases where I run laptops with the lid closed,
but still want to configure the LVDS.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_drv.c

@@ -43,6 +43,9 @@ module_param_named(modeset, i915_modeset, int, 0400);
 unsigned int i915_fbpercrtc = 0;
 module_param_named(fbpercrtc, i915_fbpercrtc, int, 0400);
 
+int i915_panel_ignore_lid = 0;
+module_param_named(panel_ignore_lid, i915_panel_ignore_lid, int, 0600);
+
 unsigned int i915_powersave = 1;
 module_param_named(powersave, i915_powersave, int, 0600);
 

drivers/gpu/drm/i915/i915_drv.h

@@ -958,6 +958,7 @@ enum intel_chip_family {
 extern struct drm_ioctl_desc i915_ioctls[];
 extern int i915_max_ioctl;
 extern unsigned int i915_fbpercrtc;
+extern int i915_panel_ignore_lid;
 extern unsigned int i915_powersave;
 extern unsigned int i915_lvds_downclock;
 extern unsigned int i915_panel_use_ssc;

drivers/gpu/drm/i915/intel_panel.c

@@ -287,6 +287,11 @@ intel_panel_detect(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
+	if (i915_panel_ignore_lid)
+		return i915_panel_ignore_lid > 0 ?
+			connector_status_connected :
+			connector_status_disconnected;
+
 	/* Assume that the BIOS does not lie through the OpRegion... */
 	if (dev_priv->opregion.lid_state)
 		return ioread32(dev_priv->opregion.lid_state) & 0x1 ?