From beb3777682d5c296cc15a2a424f5a7a98476def0 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Thu, 29 Jun 2017 16:08:49 -0400 Subject: [PATCH] drm/amdgpu: fix vblank_time when displays are off MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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)) Reviewed-by: Michel Dänzer Signed-off-by: Alex Deucher Cc: stable@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 c6dba1eaefbd..8b8eda7d1703 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, -- 2.39.5