On 30/06/17 05:16 AM, Alex Deucher wrote: > If the displays are off, set the vblank time to max to make > sure mclk switching is enabled. Avoid mclk getting set > to high when no displays are attached. > > bug: https://bugs.freedesktop.org/show_bug.cgi?id=101528 > fixes: 09be4a5219 (drm/amd/powerplay/smu7: add vblank check for mclk switching (v2)) > Signed-off-by: Alex Deucher <alexander.deucher at amd.com> > Cc: stable at vger.kernel.org > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c > index c6dba1e..8b8eda7 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c > @@ -838,6 +838,9 @@ static int amdgpu_cgs_get_active_displays_info(struct cgs_device *cgs_device, > return -EINVAL; > > mode_info = info->mode_info; > + if (mode_info) > + /* if the displays are off, vblank time is max */ > + mode_info->vblank_time_us = 0xffffffff; > > if (adev->mode_info.num_crtc && adev->mode_info.mode_config_initialized) { > list_for_each_entry(crtc, > Reviewed-by: Michel Dänzer <michel.daenzer at amd.com> -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer
