[PATCH 04/16] drm/i915/de: Introduce intel_de_wait_us()

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Introduce intel_de_wait_us() as the microsecond based
counterpart to the millisecond based intel_de_wait_ms().

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_de.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_de.h b/drivers/gpu/drm/i915/display/intel_de.h
index d449180d1d22..43a4160f760a 100644
--- a/drivers/gpu/drm/i915/display/intel_de.h
+++ b/drivers/gpu/drm/i915/display/intel_de.h
@@ -114,6 +114,23 @@ __intel_de_wait_for_register_atomic_nowl(struct intel_display *display,
 					 value, fast_timeout_us, 0, NULL);
 }
 
+static inline int
+intel_de_wait_us(struct intel_display *display, i915_reg_t reg,
+		 u32 mask, u32 value, unsigned int timeout_us,
+		 u32 *out_value)
+{
+	int ret;
+
+	intel_dmc_wl_get(display, reg);
+
+	ret = __intel_wait_for_register(__to_uncore(display), reg, mask,
+					value, timeout_us, 0, out_value);
+
+	intel_dmc_wl_put(display, reg);
+
+	return ret;
+}
+
 static inline int
 intel_de_wait_ms(struct intel_display *display, i915_reg_t reg,
 		 u32 mask, u32 value, unsigned int timeout_ms,
-- 
2.49.1