drm/i915: Extend intel_wait_for_register_fw() with fast timeout
In some cases we may want to spend more time in atomic wait than
hardcoded 2us. Let's add additional fast timeout parameter to allow
flexible configuration of atomic timeout before switching into heavy wait.
Add also possibility to return registry value to avoid extra read.
v2: use explicit fast timeout (Tvrtko/Chris)
allow returning register value (Chris)
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170407160145.181328-1-michal.wajdeczko@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 59433df..bb6fc1e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3088,11 +3088,23 @@ int intel_wait_for_register(struct drm_i915_private *dev_priv,
const u32 mask,
const u32 value,
const unsigned long timeout_ms);
+int __intel_wait_for_register_fw(struct drm_i915_private *dev_priv,
+ i915_reg_t reg,
+ const u32 mask,
+ const u32 value,
+ const unsigned int fast_timeout_us,
+ const unsigned int slow_timeout_ms,
+ u32 *out_value);
+static inline
int intel_wait_for_register_fw(struct drm_i915_private *dev_priv,
i915_reg_t reg,
const u32 mask,
const u32 value,
- const unsigned int timeout_ms);
+ const unsigned int timeout_ms)
+{
+ return __intel_wait_for_register_fw(dev_priv, reg, mask, value,
+ 2, timeout_ms, NULL);
+}
static inline bool intel_gvt_active(struct drm_i915_private *dev_priv)
{