From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Date: Thu, 2 Nov 2017 18:55:14 +0000 (-0400)
Subject: drm/amd/display: add warning on long reg_wait
X-Git-Tag: v4.16-rc1~96^2~29^2~162
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=42cf181b59b8e3cc75485fa493bd0e812f44a74b;p=thirdparty%2Fkernel%2Flinux.git

drm/amd/display: add warning on long reg_wait

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dc_helper.c b/drivers/gpu/drm/amd/display/dc/dc_helper.c
index 0d84b2a1ccfdf..c584252669fde 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",