drm/radeon/kms: add wait_for_vblank asic callback

[mirror_ubuntu-jammy-kernel.git] / drivers / gpu / drm / radeon / evergreen.c

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 1a816ea51226d70b7a5102240981bd9421deb1f8..c8dae3f9fa09895d700e55e9d8350ee9bfebec1f 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -99,6 +99,25 @@ void evergreen_fix_pci_max_read_req_size(struct radeon_device *rdev)
        }
 }
 
+void dce4_wait_for_vblank(struct radeon_device *rdev, int crtc)
+{
+       struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[crtc];
+       int i;
+
+       if (RREG32(EVERGREEN_CRTC_CONTROL + radeon_crtc->crtc_offset) & EVERGREEN_CRTC_MASTER_EN) {
+               for (i = 0; i < rdev->usec_timeout; i++) {
+                       if (!(RREG32(EVERGREEN_CRTC_STATUS + radeon_crtc->crtc_offset) & EVERGREEN_CRTC_V_BLANK))
+                               break;
+                       udelay(1);
+               }
+               for (i = 0; i < rdev->usec_timeout; i++) {
+                       if (RREG32(EVERGREEN_CRTC_STATUS + radeon_crtc->crtc_offset) & EVERGREEN_CRTC_V_BLANK)
+                               break;
+                       udelay(1);
+               }
+       }
+}
+
 void evergreen_pre_page_flip(struct radeon_device *rdev, int crtc)
 {
        /* enable the pflip int */