drm/nouveau: introduce a util function to wait on reg != val
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index e779e93..e0811f9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -1126,8 +1126,9 @@
}
/* Wait until (value(reg) & mask) == val, up until timeout has hit */
-bool nouveau_wait_until(struct drm_device *dev, uint64_t timeout,
- uint32_t reg, uint32_t mask, uint32_t val)
+bool
+nouveau_wait_eq(struct drm_device *dev, uint64_t timeout,
+ uint32_t reg, uint32_t mask, uint32_t val)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
@@ -1141,6 +1142,23 @@
return false;
}
+/* Wait until (value(reg) & mask) != val, up until timeout has hit */
+bool
+nouveau_wait_ne(struct drm_device *dev, uint64_t timeout,
+ uint32_t reg, uint32_t mask, uint32_t val)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
+ uint64_t start = ptimer->read(dev);
+
+ do {
+ if ((nv_rd32(dev, reg) & mask) != val)
+ return true;
+ } while (ptimer->read(dev) - start < timeout);
+
+ return false;
+}
+
/* Waits for PGRAPH to go completely idle */
bool nouveau_wait_for_idle(struct drm_device *dev)
{
