From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Date: Thu, 2 Nov 2017 14:55:14 -0400
Subject: drm/amd/display: add warning on long reg_wait
Git-commit: 42cf181b59b8e3cc75485fa493bd0e812f44a74b
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/display/dc/dc_helper.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- 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 d
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",