mirror of https://gitee.com/openkylin/linux.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 <tomi.valkeinen@nokia.com>
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@ -2902,6 +2902,12 @@ int omap_dsi_update(struct omap_dss_device *dssdev,
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{
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dsi.update_channel = channel;
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/* OMAP DSS cannot send updates of odd widths.
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* omap_dsi_prepare_update() makes the widths even, but add a BUG_ON
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* here to make sure we catch erroneous updates. Otherwise we'll only
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* see rather obscure HW error happening, as DSS halts. */
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BUG_ON(x % 2 == 1);
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if (dssdev->manager->caps & OMAP_DSS_OVL_MGR_CAP_DISPC) {
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dsi.framedone_callback = callback;
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dsi.framedone_data = data;
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