From: Tomi Valkeinen Date: Tue, 25 May 2010 14:01:28 +0000 (+0300) Subject: OMAP: DSS2: DSI: detect unsupported update requests X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a602771c43ed7f1a02c7766c94fda74ac5d72a8b;p=linux-beck.git OMAP: DSS2: DSI: detect unsupported update requests OMAP DSS HW cannot send updates with odd widths. Normally the widths are made even while preparing the update. This patch adds a BUG_ON() to check if the update width is even. This is to detect broken updates cleanly, as otherwise the OMAP DSS HW will just halt, leading to obscure error situations. Signed-off-by: Tomi Valkeinen --- diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c index 2ceddb83f247..a6e0f647554b 100644 --- a/drivers/video/omap2/dss/dsi.c +++ b/drivers/video/omap2/dss/dsi.c @@ -2902,6 +2902,12 @@ int omap_dsi_update(struct omap_dss_device *dssdev, { dsi.update_channel = channel; + /* OMAP DSS cannot send updates of odd widths. + * omap_dsi_prepare_update() makes the widths even, but add a BUG_ON + * here to make sure we catch erroneous updates. Otherwise we'll only + * see rather obscure HW error happening, as DSS halts. */ + BUG_ON(x % 2 == 1); + if (dssdev->manager->caps & OMAP_DSS_OVL_MGR_CAP_DISPC) { dsi.framedone_callback = callback; dsi.framedone_data = data;