This code is ported from the DRM git tree and allows the vblank interrupts
to function on the i965 hw. It also requires a change in Mesa's 965 driver
to actually use them.
[ Without this patch, my 965GM drops vblank interrupts - Jesse ]
Signed-off-by: Dave Airlie <airlied@linux.ie>
Acked-by: Jesse Barnes <jesse.barnes@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
#define I915REG_INT_MASK_R 0x020a8
#define I915REG_INT_ENABLE_R 0x020a0
#define I915REG_INT_MASK_R 0x020a8
#define I915REG_INT_ENABLE_R 0x020a0
+#define I915REG_PIPEASTAT 0x70024
+#define I915REG_PIPEBSTAT 0x71024
+
+#define I915_VBLANK_INTERRUPT_ENABLE (1UL<<17)
+#define I915_VBLANK_CLEAR (1UL<<1)
+
#define SRX_INDEX 0x3c4
#define SRX_DATA 0x3c5
#define SR01 1
#define SRX_INDEX 0x3c4
#define SRX_DATA 0x3c5
#define SR01 1
struct drm_device *dev = (struct drm_device *) arg;
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u16 temp;
struct drm_device *dev = (struct drm_device *) arg;
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u16 temp;
+ u32 pipea_stats, pipeb_stats;
+
+ pipea_stats = I915_READ(I915REG_PIPEASTAT);
+ pipeb_stats = I915_READ(I915REG_PIPEBSTAT);
temp = I915_READ16(I915REG_INT_IDENTITY_R);
temp = I915_READ16(I915REG_INT_IDENTITY_R);
return IRQ_NONE;
I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
return IRQ_NONE;
I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
+ (void) I915_READ16(I915REG_INT_IDENTITY_R);
+ DRM_READMEMORYBARRIER();
dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
if (dev_priv->swaps_pending > 0)
drm_locked_tasklet(dev, i915_vblank_tasklet);
if (dev_priv->swaps_pending > 0)
drm_locked_tasklet(dev, i915_vblank_tasklet);
+ I915_WRITE(I915REG_PIPEASTAT,
+ pipea_stats|I915_VBLANK_INTERRUPT_ENABLE|
+ I915_VBLANK_CLEAR);
+ I915_WRITE(I915REG_PIPEBSTAT,
+ pipeb_stats|I915_VBLANK_INTERRUPT_ENABLE|
+ I915_VBLANK_CLEAR);