drm/i915: Support PCH no display

GEN supports a fusing option which subtracts the PCH display (making the
CPU display also useless). In this configuration MMIO which gets decoded
to a certain range will hang the CPU.

For us, this is sort of the equivalent of having no pipes, and we can
easily modify some code to not do certain things with no pipes.

v2: Moved the num pipes check up in the call chain, and removed extra
checks noted by Daniel. For more details, see:
http://lists.freedesktop.org/archives/intel-gfx/2013-March/025746.html

v3: Drop the intel_setup_overlay check (Daniel)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 14 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 4be58e3b8e4f..4a1a517b09e5 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1322,6 +1322,10 @@ static int i915_load_modeset_init(struct drm_device *dev)
         /* Always safe in the mode setting case. */
         /* FIXME: do pre/post-mode set stuff in core KMS code */
         dev->vblank_disable_allowed = 1;
+        if (INTEL_INFO(dev)->num_pipes == 0) {
+                dev_priv->mm.suspended = 0;
+                return 0;
+        }
 
         ret = intel_fbdev_init(dev);
         if (ret)
@@ -1634,9 +1638,11 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
         if (IS_VALLEYVIEW(dev))
                 dev_priv->num_plane = 2;
 
-        ret = drm_vblank_init(dev, INTEL_INFO(dev)->num_pipes);
-        if (ret)
-                goto out_gem_unload;
+        if (INTEL_INFO(dev)->num_pipes) {
+                ret = drm_vblank_init(dev, INTEL_INFO(dev)->num_pipes);
+                if (ret)
+                        goto out_gem_unload;
+        }
 
         /* Start out suspended */
         dev_priv->mm.suspended = 1;
@@ -1651,9 +1657,11 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 
         i915_setup_sysfs(dev);
 
-        /* Must be done after probing outputs */
-        intel_opregion_init(dev);
-        acpi_video_register();
+        if (INTEL_INFO(dev)->num_pipes) {
+                /* Must be done after probing outputs */
+                intel_opregion_init(dev);
+                acpi_video_register();
+        }
 
         if (IS_GEN5(dev))
                 intel_gpu_ips_init(dev_priv);