drm: Add support for Intel i965G chipsets.

This is a patch prepared by Guangdeng Liao based off of Tungsten Graphics's
final code drop.

From: Alan Hourihane <alanh@tungstengraphics.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 11 insertions, 5 deletions

diff --git a/drivers/char/drm/i915_irq.c b/drivers/char/drm/i915_irq.c
index cd96cfa430db..0d4a162aa385 100644
--- a/drivers/char/drm/i915_irq.c
+++ b/drivers/char/drm/i915_irq.c
@@ -71,21 +71,27 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 static int i915_emit_irq(drm_device_t * dev)
 {
         drm_i915_private_t *dev_priv = dev->dev_private;
-        u32 ret;
         RING_LOCALS;
 
         i915_kernel_lost_context(dev);
 
         DRM_DEBUG("%s\n", __FUNCTION__);
 
-        ret = dev_priv->counter;
+        dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
 
-        BEGIN_LP_RING(2);
+        if (dev_priv->counter > 0x7FFFFFFFUL)
+                dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
+
+        BEGIN_LP_RING(6);
+        OUT_RING(CMD_STORE_DWORD_IDX);
+        OUT_RING(20);
+        OUT_RING(dev_priv->counter);
+        OUT_RING(0);
         OUT_RING(0);
         OUT_RING(GFX_OP_USER_INTERRUPT);
         ADVANCE_LP_RING();
-
-        return ret;
+        
+        return dev_priv->counter;
 }
 
 static int i915_wait_irq(drm_device_t * dev, int irq_nr)