drm/amdgpu/cgs: add refresh rate checking to non-DC display code

Clamp the vblank period to 0 if the refresh rate is larger than
120 hz for non-DC.  This allows us to remove the refresh rate
checks from powerplay for mclk switching.

Reviewed-by: Eric Huang <JinhuiEric.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
index 71b4aec7f6500abc7feba24b973cc3fa031cc965..dc3360b16bda600cb71755ca8f621c6d7ca0d4f9 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
@@ -953,6 +953,11 @@ static int amdgpu_cgs_get_active_displays_info(struct cgs_device *cgs_device,
                                                                (amdgpu_crtc->v_border * 2);
                                        mode_info->vblank_time_us = vblank_lines * line_time_us;
                                        mode_info->refresh_rate = drm_mode_vrefresh(&amdgpu_crtc->hw_mode);
+                                       /* we have issues with mclk switching with refresh rates
+                                        * over 120 hz on the non-DC code.
+                                        */
+                                       if (mode_info->refresh_rate > 120)
+                                               mode_info->vblank_time_us = 0;
                                        mode_info = NULL;
                                }
                        }