This patch fixes calculation of src x/y offset for negative crtc x/y values when scaling is enabled. This fixes possible IOMMU fault when scaling is enabled.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- drivers/gpu/drm/exynos/exynos_drm_plane.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c index 9eaa8627175f..427aeec78a28 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_plane.c +++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c @@ -85,25 +85,26 @@ static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state) src_w = state->src_w >> 16; src_h = state->src_h >> 16;
+ /* set ratio */ + exynos_state->h_ratio = (src_w << 16) / crtc_w; + exynos_state->v_ratio = (src_h << 16) / crtc_h; + + /* clip to visible area */ actual_w = exynos_plane_get_size(crtc_x, crtc_w, mode->hdisplay); actual_h = exynos_plane_get_size(crtc_y, crtc_h, mode->vdisplay);
if (crtc_x < 0) { if (actual_w) - src_x -= crtc_x; + src_x += ((-crtc_x) * exynos_state->h_ratio) >> 16; crtc_x = 0; }
if (crtc_y < 0) { if (actual_h) - src_y -= crtc_y; + src_y += ((-crtc_y) * exynos_state->v_ratio) >> 16; crtc_y = 0; }
- /* set ratio */ - exynos_state->h_ratio = (src_w << 16) / crtc_w; - exynos_state->v_ratio = (src_h << 16) / crtc_h; - /* set drm framebuffer data. */ exynos_state->src.x = src_x; exynos_state->src.y = src_y;