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 0d84b2a..c584252 100644 (file)
--- 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",