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authorAlex Deucher <alexander.deucher@amd.com>2013-07-08 19:26:42 +0400
committerAlex Deucher <alexander.deucher@amd.com>2013-07-09 01:40:09 +0400
commit66edc1c95d75d66b11f1d2e2332c0c27b3f89a77 (patch)
tree920848d72cf0423a0d72eac7a84528d090fbbcdd /drivers/gpu/drm/radeon/r600_dpm.c
parent7e1f3c0419b0be9f20e08848ab23221a6dc3d77e (diff)
downloadlinux-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.c24
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)
{