drm/omap: use DRM_ERROR_RATELIMITED() for error irqs

omapdrm uses normal DRM_ERROR() print when the HW reports an error. As
we sometimes may get a flood of errors, let's rather use
DRM_ERROR_RATELIMITED().
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_crtc.c

@@ -261,7 +261,7 @@ static void omap_crtc_error_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
 	struct omap_crtc *omap_crtc =
 			container_of(irq, struct omap_crtc, error_irq);
 	struct drm_crtc *crtc = &omap_crtc->base;
-	DRM_ERROR("%s: errors: %08x\n", omap_crtc->name, irqstatus);
+	DRM_ERROR_RATELIMITED("%s: errors: %08x\n", omap_crtc->name, irqstatus);
 	/* avoid getting in a flood, unregister the irq until next vblank */
 	__omap_irq_unregister(crtc->dev, &omap_crtc->error_irq);
 }

drivers/gpu/drm/omapdrm/omap_plane.c

@@ -357,7 +357,8 @@ static void omap_plane_error_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
 {
 	struct omap_plane *omap_plane =
 			container_of(irq, struct omap_plane, error_irq);
-	DRM_ERROR("%s: errors: %08x\n", omap_plane->name, irqstatus);
+	DRM_ERROR_RATELIMITED("%s: errors: %08x\n", omap_plane->name,
+		irqstatus);
 }
 
 static const char *plane_names[] = {