drm/amd/pm: avoid driver getting empty metrics table for the first time

add metrics.AccumulationCouter check to avoid driver getting an empty
metrics data since metrics table not updated completely in pmfw side.

Signed-off-by: Yang Wang <KevinYang.Wang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Tested-by: Asad Kamal <asad.kamal@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c
index 244e6d3..2898e9c 100644 (file)
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c
@@ -325,14 +325,24 @@ static int smu_v13_0_6_setup_driver_pptable(struct smu_context *smu)
        MetricsTable_t *metrics = (MetricsTable_t *)smu_table->metrics_table;
        struct PPTable_t *pptable =
                (struct PPTable_t *)smu_table->driver_pptable;
-       int ret;
-       int i;
+       int ret, i, retry = 100;
 
        /* Store one-time values in driver PPTable */
        if (!pptable->Init) {
-               ret = smu_v13_0_6_get_metrics_table(smu, NULL, false);
-               if (ret)
-                       return ret;
+               while (retry--) {
+                       ret = smu_v13_0_6_get_metrics_table(smu, NULL, true);
+                       if (ret)
+                               return ret;
+
+                       /* Ensure that metrics have been updated */
+                       if (metrics->AccumulationCounter)
+                               break;
+
+                       usleep_range(1000, 1100);
+               }
+
+               if (!retry)
+                       return -ETIME;
 
                pptable->MaxSocketPowerLimit =
                        SMUQ10_TO_UINT(metrics->MaxSocketPowerLimit);