[PATCH 03/18] drm/i915/dsi: use generic read_poll_timeout() instead of wait_for_us()

[Jani Nikula]

Prefer generic poll helpers over i915 custom helpers.

The sleep and timeout remain the same as for wait_for_us().

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/display/icl_dsi.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 8d9cb73a93a7..d4c572305804 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -25,6 +25,8 @@
  *   Jani Nikula <jani.nikula at intel.com>
  */
 
+#include <linux/iopoll.h>
+
 #include <drm/display/drm_dsc_helper.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_fixed.h>
@@ -72,8 +74,13 @@ static int payload_credits_available(struct intel_display *display,
 static bool wait_for_header_credits(struct intel_display *display,
 				    enum transcoder dsi_trans, int hdr_credit)
 {
-	if (wait_for_us(header_credits_available(display, dsi_trans) >=
-			hdr_credit, 100)) {
+	int ret;
+
+	ret = read_poll_timeout(header_credits_available, ret,
+				ret >= hdr_credit,
+				10, 100, false,
+				display, dsi_trans);
+	if (ret) {
 		drm_err(display->drm, "DSI header credits not released\n");
 		return false;
 	}
@@ -84,8 +91,13 @@ static bool wait_for_header_credits(struct intel_display *display,
 static bool wait_for_payload_credits(struct intel_display *display,
 				     enum transcoder dsi_trans, int payld_credit)
 {
-	if (wait_for_us(payload_credits_available(display, dsi_trans) >=
-			payld_credit, 100)) {
+	int ret;
+
+	ret = read_poll_timeout(payload_credits_available, ret,
+				ret >= payld_credit,
+				10, 100, false,
+				display, dsi_trans);
+	if (ret) {
 		drm_err(display->drm, "DSI payload credits not released\n");
 		return false;
 	}
-- 
2.39.5