Do you know what the sampling period is on vega? We should try and be consistent. How about making this selectable via hwmon:
power[1-*]_average_interval Power use averaging interval. A poll
notification is sent to this file if the
hardware changes the averaging interval.
Unit: milliseconds
RW
power[1-*]_average_interval_max Maximum power use averaging interval
Unit: milliseconds
RO
power[1-*]_average_interval_min Minimum power use averaging interval
Unit: milliseconds
RO
Then the user can select the interval they want.
Alex
________________________________
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> on behalf of Eric Huang <JinHuiEric.Huang at amd.com>
Sent: Thursday, March 29, 2018 3:21:52 PM
To: amd-gfx at lists.freedesktop.org
Cc: Huang, JinHuiEric
Subject: [PATCH] drm/amd/powerply: fix power reading on Fiji
Power value is wrong reported by customer. It is a regression by
commit a7c7bc4c0c47eaac77b8fa92f0672032df7f4254
Author: Rex Zhu <Rex.Zhu at amd.com>
Date: Mon Mar 27 15:32:59 2017 +0800
drm/amd/powerplay: reduce sample period time
for power readings.
Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
The theoretical sampling period is from 50ms to 4sec, original 2sec
is long but correct, and 20ms is too short. change it to more
reasonable 200ms.
Signed-off-by: Eric Huang <JinHuiEric.Huang at amd.com>
---
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
index a03b7fe..7631d80 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
@@ -3377,7 +3377,8 @@ static int smu7_get_gpu_power(struct pp_hwmgr *hwmgr,
"Failed to start pm status log!",
return -1);
- msleep_interruptible(20);
+ /* Sampling period from 50ms to 4sec */
+ msleep_interruptible(200);
PP_ASSERT_WITH_CODE(!smum_send_msg_to_smc(hwmgr,
PPSMC_MSG_PmStatusLogSample),
--
2.7.4
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