drm/amd/pm: avoid false alarm due to confusing softwareshutdowntemp setting

BugLink: https://bugs.launchpad.net/bugs/1895880
commit 971df65cbf32da9bc9af52c1196ca504dd316086 upstream.

Normally softwareshutdowntemp should be greater than Thotspotlimit.
However, on some VEGA10 ASIC, the softwareshutdowntemp is 91C while
Thotspotlimit is 105C. This seems not right and may trigger some
false alarms.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: William Breathitt Gray <william.gray@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c
index 36a17caa3761df59abe10715c3fed3d1bf4b8c28..e8d01abf27fa8b587af31b2d34795efbeb1cbc66 100644 (file)
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c
@@ -375,8 +375,18 @@ static int vega10_thermal_set_temperature_range(struct pp_hwmgr *hwmgr,
        /* compare them in unit celsius degree */
        if (low < range->min / PP_TEMPERATURE_UNITS_PER_CENTIGRADES)
                low = range->min / PP_TEMPERATURE_UNITS_PER_CENTIGRADES;
-       if (high > tdp_table->usSoftwareShutdownTemp)
-               high = tdp_table->usSoftwareShutdownTemp;
+
+       /*
+        * As a common sense, usSoftwareShutdownTemp should be bigger
+        * than ThotspotLimit. For any invalid usSoftwareShutdownTemp,
+        * we will just use the max possible setting VEGA10_THERMAL_MAXIMUM_ALERT_TEMP
+        * to avoid false alarms.
+        */
+       if ((tdp_table->usSoftwareShutdownTemp >
+            range->hotspot_crit_max / PP_TEMPERATURE_UNITS_PER_CENTIGRADES)) {
+               if (high > tdp_table->usSoftwareShutdownTemp)
+                       high = tdp_table->usSoftwareShutdownTemp;
+       }
 
        if (low > high)
                return -EINVAL;