Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit dc8184aa authored by Rex Zhu's avatar Rex Zhu Committed by Alex Deucher
Browse files

drm/amdgpu: change vblank_time's calculation method to reduce computational error. 



Signed-off-by: default avatarRex Zhu <Rex.Zhu@amd.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
parent 4a446d55

drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.c

+8 −6
Original line number Diff line number Diff line
@@ -113,24 +113,26 @@ void amdgpu_dpm_print_ps_status(struct amdgpu_device *adev, 
	printk("\n");

}





u32 amdgpu_dpm_get_vblank_time(struct amdgpu_device *adev)

{

	struct drm_device *dev = adev->ddev;

	struct drm_crtc *crtc;

	struct amdgpu_crtc *amdgpu_crtc;

	u32 line_time_us, vblank_lines;

	u32 vblank_in_pixels;

	u32 vblank_time_us = 0xffffffff; /* if the displays are off, vblank time is max */



	if (adev->mode_info.num_crtc && adev->mode_info.mode_config_initialized) {

		list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {

			amdgpu_crtc = to_amdgpu_crtc(crtc);

			if (crtc->enabled && amdgpu_crtc->enabled && amdgpu_crtc->hw_mode.clock) {

				line_time_us = (amdgpu_crtc->hw_mode.crtc_htotal * 1000) /

					amdgpu_crtc->hw_mode.clock;

				vblank_lines = amdgpu_crtc->hw_mode.crtc_vblank_end -

				vblank_in_pixels =

					amdgpu_crtc->hw_mode.crtc_htotal *

					(amdgpu_crtc->hw_mode.crtc_vblank_end -

					amdgpu_crtc->hw_mode.crtc_vdisplay +

					(amdgpu_crtc->v_border * 2);

				vblank_time_us = vblank_lines * line_time_us;

					(amdgpu_crtc->v_border * 2));



				vblank_time_us = vblank_in_pixels * 1000 / amdgpu_crtc->hw_mode.clock;

				break;

			}

		}