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drm/amdgpu: change vblank_time's calculation method to reduce computational error.
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
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1 changed files with 8 additions and 6 deletions
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@ -113,24 +113,26 @@ void amdgpu_dpm_print_ps_status(struct amdgpu_device *adev,
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printk("\n");
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}
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u32 amdgpu_dpm_get_vblank_time(struct amdgpu_device *adev)
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{
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struct drm_device *dev = adev->ddev;
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struct drm_crtc *crtc;
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struct amdgpu_crtc *amdgpu_crtc;
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u32 line_time_us, vblank_lines;
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u32 vblank_in_pixels;
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u32 vblank_time_us = 0xffffffff; /* if the displays are off, vblank time is max */
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if (adev->mode_info.num_crtc && adev->mode_info.mode_config_initialized) {
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list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
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amdgpu_crtc = to_amdgpu_crtc(crtc);
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if (crtc->enabled && amdgpu_crtc->enabled && amdgpu_crtc->hw_mode.clock) {
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line_time_us = (amdgpu_crtc->hw_mode.crtc_htotal * 1000) /
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amdgpu_crtc->hw_mode.clock;
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vblank_lines = amdgpu_crtc->hw_mode.crtc_vblank_end -
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vblank_in_pixels =
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amdgpu_crtc->hw_mode.crtc_htotal *
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(amdgpu_crtc->hw_mode.crtc_vblank_end -
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amdgpu_crtc->hw_mode.crtc_vdisplay +
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(amdgpu_crtc->v_border * 2);
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vblank_time_us = vblank_lines * line_time_us;
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(amdgpu_crtc->v_border * 2));
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vblank_time_us = vblank_in_pixels * 1000 / amdgpu_crtc->hw_mode.clock;
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break;
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}
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}
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