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@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>

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
index 2b0c366d6149f0f15403f6683f808ba23fa846f8..add90675fd2afcfd72d66b8f30f4f6c4ab6a2540 100644 (file)
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
@@ -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),