Not having an endpoint bound in DT should not cause a failure here, there are fallbacks. So explicitly accept a missing endpoint.
This behavior change was introduced by refactoring in drm_of parsing code and it should not require dts changes.
In particular this fixes imx6qdl-sabreauto boards.
Link: https://lists.freedesktop.org/archives/dri-devel/2017-May/141233.html Fixes: ebc944613567 ("drm: convert drivers to use drm_of_find_panel_or_bridge") Signed-off-by: Leonard Crestez leonard.crestez@nxp.com
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This relies on drm_of_find_panel_or_bridge returning -ENODEV specifically if no remote is found for the endpoint. This behavior can be seen by looking at the code but is not otherwise obviously guaranteed.
Perhaps this should be explicitly mentioned in that function's documentation?
Changes since v1: * Fix returning if ret is 0.
drivers/gpu/drm/imx/imx-ldb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c index 8fb801f..8b05ecb 100644 --- a/drivers/gpu/drm/imx/imx-ldb.c +++ b/drivers/gpu/drm/imx/imx-ldb.c @@ -673,7 +673,7 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) ret = drm_of_find_panel_or_bridge(child, imx_ldb->lvds_mux ? 4 : 2, 0, &channel->panel, &channel->bridge); - if (ret) + if (ret && ret != -ENODEV) return ret;
/* panel ddc only if there is no bridge */
dri-devel@lists.freedesktop.org
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Leonard Crestez -
Philipp Zabel