4.12-stable review patch. If anyone has any objections, please let me know.
------------------ From: Philipp Zabel <[email protected]> commit 799ee2970485dc206c3bf347d6e6827c04d5e4f9 upstream. The parallel panel driver should continue to work without having an endpoint linking to an panel in DT for backwards compatibility. With the recent switch to drm_of_find_panel_or_bridge, an absent panel results in a failure with -ENODEV error return code. To restore the old behaviour, ignore the -ENODEV return code. Reported-by: Nikita Yushchenko <[email protected]> Fixes: ebc944613567 ("drm: convert drivers to use drm_of_find_panel_or_bridge") Tested-by: Chris Healy <[email protected]> Signed-off-by: Philipp Zabel <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/gpu/drm/imx/parallel-display.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/imx/parallel-display.c +++ b/drivers/gpu/drm/imx/parallel-display.c @@ -237,7 +237,7 @@ static int imx_pd_bind(struct device *de /* port@1 is the output port */ ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge); - if (ret) + if (ret && ret != -ENODEV) return ret; imxpd->dev = dev;
