drm/i915: update last_vblank when disabling the power well

[linux-imx.git] / drivers / gpu / drm / i915 / intel_pm.c

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f895d1508df8fbb9646ed064f1d2ce8244d4f4d0..b0e4a0bd1313c0dafac84df1b6af56e7ccced950 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5063,8 +5063,26 @@ static void __intel_set_power_well(struct drm_device *dev, bool enable)
                }
        } else {
                if (enable_requested) {
+                       unsigned long irqflags;
+                       enum pipe p;
+
                        I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
+                       POSTING_READ(HSW_PWR_WELL_DRIVER);
                        DRM_DEBUG_KMS("Requesting to disable the power well\n");
+
+                       /*
+                        * After this, the registers on the pipes that are part
+                        * of the power well will become zero, so we have to
+                        * adjust our counters according to that.
+                        *
+                        * FIXME: Should we do this in general in
+                        * drm_vblank_post_modeset?
+                        */
+                       spin_lock_irqsave(&dev->vbl_lock, irqflags);
+                       for_each_pipe(p)
+                               if (p != PIPE_A)
+                                       dev->last_vblank[p] = 0;
+                       spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
                }
        }
 }