4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chen-Yu Tsai <wens@xxxxxxxx> [ Upstream commit 7544860733d158e3edbf309f27e79e258c8f66bd ] The way drm_of_find_possible_crtcs works is it tries to match the remote-endpoint of the given node's various endpoints to all the crtc's .port field. Thus we need to set drm_crtc.port to the output port node of the underlying TCON. Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx> Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/sun4i/sun4i_crtc.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/gpu/drm/sun4i/sun4i_crtc.c +++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c @@ -19,6 +19,7 @@ #include <linux/clk-provider.h> #include <linux/ioport.h> #include <linux/of_address.h> +#include <linux/of_graph.h> #include <linux/of_irq.h> #include <linux/regmap.h> @@ -136,5 +137,9 @@ struct sun4i_crtc *sun4i_crtc_init(struc drm_crtc_helper_add(&scrtc->crtc, &sun4i_crtc_helper_funcs); + /* Set crtc.port to output port node of the tcon */ + scrtc->crtc.port = of_graph_get_port_by_id(drv->tcon->dev->of_node, + 1); + return scrtc; }