[PATCH 31/73] drm/amd/display: add warning on long reg_wait

[Harry Wentland]

From: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>

Change-Id: I237ee9baaeb91434d94abe0b2ce052f9f4f67799
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Harry Wentland <harry.wentland at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc_helper.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc_helper.c b/drivers/gpu/drm/amd/display/dc/dc_helper.c
index 0d84b2a1ccfd..c584252669fd 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_helper.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_helper.c
@@ -156,8 +156,13 @@ uint32_t generic_reg_wait(const struct dc_context *ctx,
 
 		field_value = get_reg_field_value_ex(reg_val, mask, shift);
 
-		if (field_value == condition_value)
+		if (field_value == condition_value) {
+			if (i * delay_between_poll_us > 1000)
+				dm_output_to_console("REG_WAIT taking a while: %dms in %s line:%d\n",
+						delay_between_poll_us * i / 1000,
+						func_name, line);
 			return reg_val;
+		}
 	}
 
 	dm_error("REG_WAIT timeout %dus * %d tries - %s line:%d\n",
-- 
2.14.1