drm/radeon/kms: add wait_for_vblank asic callback

Required for future functionality.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index 99bb00649357..65fe8e092a18 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -65,6 +65,40 @@ MODULE_FIRMWARE(FIRMWARE_R520);
 
 #include "r100_track.h"
 
+void r100_wait_for_vblank(struct radeon_device *rdev, int crtc)
+{
+        struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[crtc];
+        int i;
+
+        if (radeon_crtc->crtc_id == 0) {
+                if (RREG32(RADEON_CRTC_GEN_CNTL) & RADEON_CRTC_EN) {
+                        for (i = 0; i < rdev->usec_timeout; i++) {
+                                if (!(RREG32(RADEON_CRTC_STATUS) & RADEON_CRTC_VBLANK_CUR))
+                                        break;
+                                udelay(1);
+                        }
+                        for (i = 0; i < rdev->usec_timeout; i++) {
+                                if (RREG32(RADEON_CRTC_STATUS) & RADEON_CRTC_VBLANK_CUR)
+                                        break;
+                                udelay(1);
+                        }
+                }
+        } else {
+                if (RREG32(RADEON_CRTC2_GEN_CNTL) & RADEON_CRTC2_EN) {
+                        for (i = 0; i < rdev->usec_timeout; i++) {
+                                if (!(RREG32(RADEON_CRTC2_STATUS) & RADEON_CRTC2_VBLANK_CUR))
+                                        break;
+                                udelay(1);
+                        }
+                        for (i = 0; i < rdev->usec_timeout; i++) {
+                                if (RREG32(RADEON_CRTC2_STATUS) & RADEON_CRTC2_VBLANK_CUR)
+                                        break;
+                                udelay(1);
+                        }
+                }
+        }
+}
+
 /* This files gather functions specifics to:
  * r100,rv100,rs100,rv200,rs200,r200,rv250,rs300,rv280
  */