drm: renesas: rz-du: Increase supported resolutions

The supported resolutions were misrepresented in earlier versions of
hardware manuals.

Fixes: 768e9e6 ("drm: renesas: Add RZ/G2L DU Support")
Cc: [email protected]
Signed-off-by: Chris Brandt <[email protected]>
Tested-by: Hugo Villeneuve <[email protected]>
Reviewed-by: Biju Das <[email protected]>
Signed-off-by: Biju Das <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: seebe

drivers/gpu/drm/renesas/rz-du/rzg2l_du_kms.c

@@ -311,11 +311,11 @@ int rzg2l_du_modeset_init(struct rzg2l_du_device *rcdu)
 	dev->mode_config.helper_private = &rzg2l_du_mode_config_helper;
 
 	/*
-	 * The RZ DU uses the VSP1 for memory access, and is limited
-	 * to frame sizes of 1920x1080.
+	 * The RZ DU was designed to support a frame size of 1920x1200 (landscape)
+	 * or 1200x1920 (portrait).
 	 */
 	dev->mode_config.max_width = 1920;
-	dev->mode_config.max_height = 1080;
+	dev->mode_config.max_height = 1920;
 
 	rcdu->num_crtcs = hweight8(rcdu->info->channels_mask);