drm/amdgpu/cgs: always set reference clock in mode_info

It's relevent regardless of whether there are displays
enabled.  Fixes garbage values for ref clock in powerplay
leading to incorrect fan speed reporting when displays
are disabled.

bug: https://bugs.freedesktop.org/show_bug.cgi?id=101653
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
index 8b8eda7d1703..c0a806280257 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
@@ -838,9 +838,12 @@ static int amdgpu_cgs_get_active_displays_info(struct cgs_device *cgs_device,
                 return -EINVAL;
 
         mode_info = info->mode_info;
-        if (mode_info)
+        if (mode_info) {
                 /* if the displays are off, vblank time is max */
                 mode_info->vblank_time_us = 0xffffffff;
+                /* always set the reference clock */
+                mode_info->ref_clock = adev->clock.spll.reference_freq;
+        }
 
         if (adev->mode_info.num_crtc && adev->mode_info.mode_config_initialized) {
                 list_for_each_entry(crtc,