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Commit 02cfb5fc authored by Alex Deucher's avatar Alex Deucher
Browse files

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



Ported from Rex's amdgpu change.

Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
parent dc8184aa

drivers/gpu/drm/radeon/r600_dpm.c

+8 −7
Original line number Diff line number Diff line
@@ -156,19 +156,20 @@ u32 r600_dpm_get_vblank_time(struct radeon_device *rdev) 
	struct drm_device *dev = rdev->ddev;

	struct drm_crtc *crtc;

	struct radeon_crtc *radeon_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 (rdev->num_crtc && rdev->mode_info.mode_config_initialized) {

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

			radeon_crtc = to_radeon_crtc(crtc);

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

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

					radeon_crtc->hw_mode.clock;

				vblank_lines = radeon_crtc->hw_mode.crtc_vblank_end -

				vblank_in_pixels =

					radeon_crtc->hw_mode.crtc_htotal *

					(radeon_crtc->hw_mode.crtc_vblank_end -

					 radeon_crtc->hw_mode.crtc_vdisplay +

					(radeon_crtc->v_border * 2);

				vblank_time_us = vblank_lines * line_time_us;

					 (radeon_crtc->v_border * 2));



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

				break;

			}

		}