From: Dmytro Laktyushkin 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 Reviewed-by: Tony Cheng Acked-by: Harry Wentland Signed-off-by: Alex Deucher Acked-by: Petr Tesarik --- 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",