[PATCH 4/8] drm/i915/cdclk: use intel_de_wait_custom() instead of wait_for_us()

[Jani Nikula]

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

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/display/intel_cdclk.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index 228aa64c1349..2a2d6714e4f4 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -903,8 +903,10 @@ static void bdw_set_cdclk(struct intel_display *display,
 	 * According to the spec, it should be enough to poll for this 1 us.
 	 * However, extensive testing shows that this can take longer.
 	 */
-	if (wait_for_us(intel_de_read(display, LCPLL_CTL) &
-			LCPLL_CD_SOURCE_FCLK_DONE, 100))
+	ret = intel_de_wait_custom(display, LCPLL_CTL,
+				   LCPLL_CD_SOURCE_FCLK_DONE, LCPLL_CD_SOURCE_FCLK_DONE,
+				   100, 0, NULL);
+	if (ret)
 		drm_err(display->drm, "Switching to FCLK failed\n");
 
 	intel_de_rmw(display, LCPLL_CTL,
@@ -913,8 +915,10 @@ static void bdw_set_cdclk(struct intel_display *display,
 	intel_de_rmw(display, LCPLL_CTL,
 		     LCPLL_CD_SOURCE_FCLK, 0);
 
-	if (wait_for_us((intel_de_read(display, LCPLL_CTL) &
-			 LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1))
+	ret = intel_de_wait_custom(display, LCPLL_CTL,
+				   LCPLL_CD_SOURCE_FCLK_DONE, 0,
+				   1, 0, NULL);
+	if (ret)
 		drm_err(display->drm, "Switching back to LCPLL failed\n");
 
 	intel_pcode_write(display->drm, HSW_PCODE_DE_WRITE_FREQ_REQ,
-- 
2.39.5