drm/vc4: Support the case where the DSI device is disabled
Having a device with a status property != "okay" in the DT is a valid
use case, and we should not prevent the registration of the DRM device
when the DSI device connected to the DSI controller is disabled.
Consider the ENODEV return code as a valid result and do not expose the
DSI encoder/connector when it happens.
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180509130042.9435-5-boris.brezillon@bootlin.com
diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index 9c8e893..0c607eb 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -1612,8 +1612,18 @@
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
&panel, &dsi->bridge);
- if (ret)
+ if (ret) {
+ /* If the bridge or panel pointed by dev->of_node is not
+ * enabled, just return 0 here so that we don't prevent the DRM
+ * dev from being registered. Of course that means the DSI
+ * encoder won't be exposed, but that's not a problem since
+ * nothing is connected to it.
+ */
+ if (ret == -ENODEV)
+ return 0;
+
return ret;
+ }
if (panel) {
dsi->bridge = devm_drm_panel_bridge_add(dev, panel,
@@ -1664,7 +1674,8 @@
struct vc4_dev *vc4 = to_vc4_dev(drm);
struct vc4_dsi *dsi = dev_get_drvdata(dev);
- pm_runtime_disable(dev);
+ if (dsi->bridge)
+ pm_runtime_disable(dev);
vc4_dsi_encoder_destroy(dsi->encoder);