This reading method is shared with AGT tool only on Fiji, because SMU FW doesn't support PPSMC_MSG_GetCurrPkgPwr message on Fiji. But since polaris10, PPSMC_MSG_GetCurrPkgPwr has been supported. We also use PPSMC_MSG_GetCurrPkgPwr on vega which SMU FW control sampling period. Driver will not care about it.

Eric

On 2018-03-29 03:31 PM, Deucher, Alexander wrote:

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-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org> on behalf of Eric Huang <JinHuiEric.Huang-5C7GfCeVMHo@public.gmane.org>
Sent: Thursday, March 29, 2018 3:21:52 PM
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.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-5C7GfCeVMHo@public.gmane.org>
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-5C7GfCeVMHo@public.gmane.org>
    Reviewed-by: Alex Deucher <alexander.deucher-5C7GfCeVMHo@public.gmane.org>
    Signed-off-by: Alex Deucher <alexander.deucher-5C7GfCeVMHo@public.gmane.org>

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-5C7GfCeVMHo@public.gmane.org>
---
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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