drm/i915/plane: warn on non-zero plane offset

[platform/kernel/linux-starfive.git] / drivers / gpu / drm / i915 / display / i9xx_plane.c

diff --git a/drivers/gpu/drm/i915/display/i9xx_plane.c b/drivers/gpu/drm/i915/display/i9xx_plane.c
index 616654a..b104883 100644 (file)
--- a/drivers/gpu/drm/i915/display/i9xx_plane.c
+++ b/drivers/gpu/drm/i915/display/i9xx_plane.c
@@ -1033,10 +1033,13 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
                                               DSPLINOFF(i9xx_plane));
                base = intel_de_read(dev_priv, DSPSURF(i9xx_plane)) & DISP_ADDR_MASK;
        } else {
+               offset = 0;
                base = intel_de_read(dev_priv, DSPADDR(i9xx_plane));
        }
        plane_config->base = base;
 
+       drm_WARN_ON(&dev_priv->drm, offset != 0);
+
        val = intel_de_read(dev_priv, PIPESRC(pipe));
        fb->width = REG_FIELD_GET(PIPESRC_WIDTH_MASK, val) + 1;
        fb->height = REG_FIELD_GET(PIPESRC_HEIGHT_MASK, val) + 1;