[Intel-gfx] [PATCH] drm/i915: fix startup hang on some non-mobile platforms

[Jesse Barnes]

Due to a bogus FBC support check and failing to check for FBC support
in the right places, mode setting on non-mobile platforms could fail
and hang in the FBC disable routine.  Fix it up.

This fix highlights the need for cleanups in this area (function
pointers and better feature support checks).  Patches for that to
follow.

Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 0344afd..09e9874 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -929,7 +929,7 @@ extern int i915_wait_ring(struct drm_device * dev, int n, const char *caller);
 
 #define HAS_FW_BLC(dev) (IS_I9XX(dev) || IS_G4X(dev) || IS_IGDNG(dev))
 #define HAS_PIPE_CXSR(dev) (IS_G4X(dev) || IS_IGDNG(dev))
-#define I915_HAS_FBC(dev) (IS_I9XX(dev) || IS_I965G(dev))
+#define I915_HAS_FBC(dev) (IS_MOBILE(dev) && (IS_I9XX(dev) || IS_I965G(dev)))
 
 #define PRIMARY_RINGBUFFER_SIZE         (128*1024)
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 6c89f2f..7762ced 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -984,7 +984,7 @@ int i915_driver_irq_postinstall(struct drm_device *dev)
 		dev_priv->hotplug_supported_mask = CRT_HOTPLUG_INT_STATUS |
 			TV_HOTPLUG_INT_STATUS | SDVOC_HOTPLUG_INT_STATUS |
 			SDVOB_HOTPLUG_INT_STATUS;
-		if (IS_G4X(dev)) {
+		if (IS_G4X(dev) && 0) {
 			dev_priv->hotplug_supported_mask |=
 				HDMIB_HOTPLUG_INT_STATUS |
 				HDMIC_HOTPLUG_INT_STATUS |
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index cadb9ef..36a36d7 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1005,6 +1005,9 @@ void i8xx_disable_fbc(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 fbc_ctl;
 
+	if (!I915_HAS_FBC(dev))
+		return;
+
 	/* Disable compression */
 	fbc_ctl = I915_READ(FBC_CONTROL);
 	fbc_ctl &= ~FBC_CTL_EN;