[PATCH v2] drm/i915/ddi: use intel_de_wait_custom() instead of wait_for_us()

[Jani Nikula]

Prefer the register read specific wait function over i915 wait_for_us().

v2: Wait for bits to clear in mtl_ddi_disable_d2d()

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 0405396c7750..866ed3e46664 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -2561,6 +2561,7 @@ mtl_ddi_enable_d2d(struct intel_encoder *encoder)
 	enum port port = encoder->port;
 	i915_reg_t reg;
 	u32 set_bits, wait_bits;
+	int ret;
 
 	if (DISPLAY_VER(display) < 14)
 		return;
@@ -2576,7 +2577,11 @@ mtl_ddi_enable_d2d(struct intel_encoder *encoder)
 	}
 
 	intel_de_rmw(display, reg, 0, set_bits);
-	if (wait_for_us(intel_de_read(display, reg) & wait_bits, 100)) {
+
+	ret = intel_de_wait_custom(display, reg,
+				   wait_bits, wait_bits,
+				   100, 0, NULL);
+	if (ret) {
 		drm_err(display->drm, "Timeout waiting for D2D Link enable for DDI/PORT_BUF_CTL %c\n",
 			port_name(port));
 	}
@@ -3058,6 +3063,7 @@ mtl_ddi_disable_d2d(struct intel_encoder *encoder)
 	enum port port = encoder->port;
 	i915_reg_t reg;
 	u32 clr_bits, wait_bits;
+	int ret;
 
 	if (DISPLAY_VER(display) < 14)
 		return;
@@ -3073,7 +3079,11 @@ mtl_ddi_disable_d2d(struct intel_encoder *encoder)
 	}
 
 	intel_de_rmw(display, reg, clr_bits, 0);
-	if (wait_for_us(!(intel_de_read(display, reg) & wait_bits), 100))
+
+	ret = intel_de_wait_custom(display, reg,
+				   wait_bits, 0,
+				   100, 0, NULL);
+	if (ret)
 		drm_err(display->drm, "Timeout waiting for D2D Link disable for DDI/PORT_BUF_CTL %c\n",
 			port_name(port));
 }
-- 
2.39.5