diff options
| author | Alex Deucher <alexander.deucher@amd.com> | 2013-07-08 19:26:42 +0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2013-07-09 01:40:09 +0400 |
| commit | 66edc1c95d75d66b11f1d2e2332c0c27b3f89a77 (patch) | |
| tree | 920848d72cf0423a0d72eac7a84528d090fbbcdd /drivers/gpu/drm/radeon/r600_dpm.c | |
| parent | 7e1f3c0419b0be9f20e08848ab23221a6dc3d77e (diff) | |
| download | linux-66edc1c95d75d66b11f1d2e2332c0c27b3f89a77.tar.xz | |
drm/radeon/dpm: add helper to calculate vblank time
Required for checking vblank time for mclk changes.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/r600_dpm.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/r600_dpm.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r600_dpm.c b/drivers/gpu/drm/radeon/r600_dpm.c index 76368c04f809..b88f54b134ab 100644 --- a/drivers/gpu/drm/radeon/r600_dpm.c +++ b/drivers/gpu/drm/radeon/r600_dpm.c @@ -150,6 +150,30 @@ void r600_dpm_print_ps_status(struct radeon_device *rdev, printk("\n"); } +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_time_us = 0xffffffff; /* if the displays are off, vblank time is max */ + + 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 - + radeon_crtc->hw_mode.crtc_vdisplay + + (radeon_crtc->v_border * 2); + vblank_time_us = vblank_lines * line_time_us; + break; + } + } + + return vblank_time_us; +} + void r600_calculate_u_and_p(u32 i, u32 r_c, u32 p_b, u32 *p, u32 *u) { |