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

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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
This commit is contained in:
Rex Zhu 2016-10-10 15:57:21 +08:00 • committed by Alex Deucher
parent 4a446d5584
commit dc8184aa86
1 changed files with 8 additions and 6 deletions
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14
drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.c
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@ -113,24 +113,26 @@ void amdgpu_dpm_print_ps_status(struct amdgpu_device *adev,
printk("\n"); printk("\n");
} }
u32 amdgpu_dpm_get_vblank_time(struct amdgpu_device *adev) u32 amdgpu_dpm_get_vblank_time(struct amdgpu_device *adev)
{ {
struct drm_device *dev = adev->ddev; struct drm_device *dev = adev->ddev;
struct drm_crtc *crtc; struct drm_crtc *crtc;
struct amdgpu_crtc *amdgpu_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 */ 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) { if (adev->mode_info.num_crtc && adev->mode_info.mode_config_initialized) {
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
amdgpu_crtc = to_amdgpu_crtc(crtc); amdgpu_crtc = to_amdgpu_crtc(crtc);
if (crtc->enabled && amdgpu_crtc->enabled && amdgpu_crtc->hw_mode.clock) { if (crtc->enabled && amdgpu_crtc->enabled && amdgpu_crtc->hw_mode.clock) {
line_time_us = (amdgpu_crtc->hw_mode.crtc_htotal * 1000) / vblank_in_pixels =
amdgpu_crtc->hw_mode.clock; amdgpu_crtc->hw_mode.crtc_htotal *
vblank_lines = amdgpu_crtc->hw_mode.crtc_vblank_end - (amdgpu_crtc->hw_mode.crtc_vblank_end -
amdgpu_crtc->hw_mode.crtc_vdisplay + amdgpu_crtc->hw_mode.crtc_vdisplay +
(amdgpu_crtc->v_border * 2); (amdgpu_crtc->v_border * 2));
vblank_time_us = vblank_lines * line_time_us;
vblank_time_us = vblank_in_pixels * 1000 / amdgpu_crtc->hw_mode.clock;
break; break;
} }
} }