drm/omap: Remove unneeded fallback for missing .check_timings()

The .check_timings() operation is present in all panels and connectors.
The fallback that uses .get_timings() in the absence of .check_timings()
is thus unneeded.

While it could be argued that the fallback implements a useful check
that should be extended to cover all fixed-resolution panels, the code
is currently unused and gets in the way of the ongoing refactoring.
Remove it, a similar feature can always be added later.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_connector.c

@@ -261,30 +261,7 @@ static int omap_connector_mode_valid(struct drm_connector *connector,
 	drm_display_mode_to_videomode(mode, &vm);
 	mode->vrefresh = drm_mode_vrefresh(mode);
 
-	/*
-	 * if the panel driver doesn't have a check_timings, it's most likely
-	 * a fixed resolution panel, check if the timings match with the
-	 * panel's timings
-	 */
-	if (dssdev->ops->check_timings) {
-		r = dssdev->ops->check_timings(dssdev, &vm);
-	} else {
-		struct videomode t = {0};
-
-		dssdev->ops->get_timings(dssdev, &t);
-
-		/*
-		 * Ignore the flags, as we don't get them from
-		 * drm_display_mode_to_videomode.
-		 */
-		t.flags = 0;
-
-		if (memcmp(&vm, &t, sizeof(vm)))
-			r = -EINVAL;
-		else
-			r = 0;
-	}
-
+	r = dssdev->ops->check_timings(dssdev, &vm);
 	if (!r) {
 		/* check if vrefresh is still valid */
 		new_mode = drm_mode_duplicate(dev, mode);

drivers/gpu/drm/omapdrm/omap_encoder.c

@@ -101,21 +101,9 @@ static int omap_encoder_update(struct drm_encoder *encoder,
 	struct omap_dss_device *dssdev = omap_encoder->display;
 	int ret;
 
-	if (dssdev->ops->check_timings) {
-		ret = dssdev->ops->check_timings(dssdev, vm);
-	} else {
-		struct videomode t = {0};
-
-		dssdev->ops->get_timings(dssdev, &t);
-
-		if (memcmp(vm, &t, sizeof(*vm)))
-			ret = -EINVAL;
-		else
-			ret = 0;
-	}
-
+	ret = dssdev->ops->check_timings(dssdev, vm);
 	if (ret) {
-		dev_err(dev->dev, "could not set timings: %d\n", ret);
+		dev_err(dev->dev, "invalid timings: %d\n", ret);
 		return ret;
 	}