drm/radeon: fix interlaced modes on DCE8

Need to double the viewport height.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index ed644a4f6f57c4254349c3881a16955cd42cbc05..86807ee91bd13a7640f5b925aa4b5a4c0d9d615d 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1405,6 +1405,9 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
               (x << 16) | y);
        viewport_w = crtc->mode.hdisplay;
        viewport_h = (crtc->mode.vdisplay + 1) & ~1;
+       if ((rdev->family >= CHIP_BONAIRE) &&
+           (crtc->mode.flags & DRM_MODE_FLAG_INTERLACE))
+               viewport_h *= 2;
        WREG32(EVERGREEN_VIEWPORT_SIZE + radeon_crtc->crtc_offset,
               (viewport_w << 16) | viewport_h);