From 86286c1192838a0931aac74a051cff5ae8073e06 Mon Sep 17 00:00:00 2001 From: Eric Huang Date: Thu, 29 Mar 2018 11:49:51 -0400 Subject: [PATCH 3976/4131] 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 Date: Mon Mar 27 15:32:59 2017 +0800 drm/amd/powerplay: reduce sample period time for power readings. Signed-off-by: Rex Zhu Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher 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 Acked-by: Alex Deucher --- 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 8f40803..123cbfc 100644 --- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c @@ -3367,7 +3367,8 @@ 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