drm/i915: don't trigger ironlake vblank interrupt at irq install

Zhenyu noticed that the ironlake vblank enabling patch has one
issue that it will trigger vblank starting from irq postinstall,
this isn't necessary. This patch addresses this issue by only
adding the vblank into DEIER but mask them in DEIMR, so that it
won't trigger vblank interrupt at irq install.

Signed-off-by: Li Peng <peng.li@intel.com>
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index e7472d82132a..fcd87ad75fec 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1022,14 +1022,13 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
 {
         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
         /* enable kind of interrupts always enabled */
-        u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
-                           DE_PIPEA_VBLANK | DE_PIPEB_VBLANK;
+        u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT;
         u32 render_mask = GT_USER_INTERRUPT;
         u32 hotplug_mask = SDE_CRT_HOTPLUG | SDE_PORTB_HOTPLUG |
                            SDE_PORTC_HOTPLUG | SDE_PORTD_HOTPLUG;
 
         dev_priv->irq_mask_reg = ~display_mask;
-        dev_priv->de_irq_enable_reg = display_mask;
+        dev_priv->de_irq_enable_reg = display_mask | DE_PIPEA_VBLANK | DE_PIPEB_VBLANK;
 
         /* should always can generate irq */
         I915_WRITE(DEIIR, I915_READ(DEIIR));