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drm/amd/powerply: fix power reading on Fiji

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Power value is wrong reported by customer. It is a regression by

commit a7c7bc4c0c
Author: Rex Zhu <Rex.Zhu@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@amd.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@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@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Huang 2018-03-29 11:49:51 -04:00 committed by Alex Deucher
parent 5d41535c5d
commit 46bce67f62
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
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@ -3374,7 +3374,8 @@ 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),