drm/i915: fix GEN7_ERR_INT init/reset code

Same as SERR_INT and the other IIR registers: reset on
preinstall/uninstall and WARN for non-zero values at postinstall. This
one also doesn't need double-clear.

v2: - Remove the is_zero assertion (Ben).

Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index bfb7e14..ace3703 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2905,6 +2905,9 @@ static void ironlake_irq_preinstall(struct drm_device *dev)
 
        GEN5_IRQ_RESET(DE);
 
+       if (IS_GEN7(dev))
+               I915_WRITE(GEN7_ERR_INT, 0xffffffff);
+
        gen5_gt_irq_preinstall(dev);
 
        ibx_irq_preinstall(dev);
@@ -3063,8 +3066,6 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
                                DE_PLANEA_FLIP_DONE_IVB | DE_AUX_CHANNEL_A_IVB);
                extra_mask = (DE_PIPEC_VBLANK_IVB | DE_PIPEB_VBLANK_IVB |
                              DE_PIPEA_VBLANK_IVB | DE_ERR_INT_IVB);
-
-               I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
        } else {
                display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
                                DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE |
@@ -3343,7 +3344,7 @@ static void ironlake_irq_uninstall(struct drm_device *dev)
 
        GEN5_IRQ_RESET(DE);
        if (IS_GEN7(dev))
-               I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
+               I915_WRITE(GEN7_ERR_INT, 0xffffffff);
 
        GEN5_IRQ_RESET(GT);
        if (INTEL_INFO(dev)->gen >= 6)