Re: [PATCH v4 05/11] drm/rockchip: analogix_dp: make panel detect to an optional action

Sean Paul
2016-06-29T14:09:57Z

On Wed, Jun 29, 2016 at 5:15 AM, Yakir Yang <ykk@rock-chips.com> wrote:
> Some boards don't need to declare a panel device node, like the
> display interface is DP monitors, so it's necessary to make the
> panel detect to an optional action.
>
> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> Acked-by: Mark Yao <mark.yao@rock-chips.com>
> Reviewed-by: Tomasz Figa <tomasz.figa@chromium.com>

Reviewed-by: Sean Paul <seanpaul@chromium.org>

> ---
> Changes in v4:
> - Move of_node_put(panel_node) directly below of_drm_find_panel (Sean)
> - Add reviewed flag from Tomasz
>
> Changes in v3:
> - Add the acked flag from Mark.
>
> drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 47 +++++++++++--------------
> 1 file changed, 21 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index 8557a08..0755573 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -329,38 +329,33 @@ static int rockchip_dp_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct device_node *panel_node, *port, *endpoint;
> + struct drm_panel *panel = NULL;
> struct rockchip_dp_device *dp;
> - struct drm_panel *panel;
>
> port = of_graph_get_port_by_id(dev->of_node, 1);
> - if (!port) {
> - dev_err(dev, "can't find output port\n");
> - return -EINVAL;
> - }
> -
> - endpoint = of_get_child_by_name(port, "endpoint");
> - of_node_put(port);
> - if (!endpoint) {
> - dev_err(dev, "no output endpoint found\n");
> - return -EINVAL;
> - }
> -
> - panel_node = of_graph_get_remote_port_parent(endpoint);
> - of_node_put(endpoint);
> - if (!panel_node) {
> - dev_err(dev, "no output node found\n");
> - return -EINVAL;
> - }
> -
> - panel = of_drm_find_panel(panel_node);
> - if (!panel) {
> - DRM_ERROR("failed to find panel\n");
> + if (port) {
> + endpoint = of_get_child_by_name(port, "endpoint");
> + of_node_put(port);
> + if (!endpoint) {
> + dev_err(dev, "no output endpoint found\n");
> + return -EINVAL;
> + }
> +
> + panel_node = of_graph_get_remote_port_parent(endpoint);
> + of_node_put(endpoint);
> + if (!panel_node) {
> + dev_err(dev, "no output node found\n");
> + return -EINVAL;
> + }
> +
> + panel = of_drm_find_panel(panel_node);
> of_node_put(panel_node);
> - return -EPROBE_DEFER;
> + if (!panel) {
> + DRM_ERROR("failed to find panel\n");
> + return -EPROBE_DEFER;
> + }
> }
>
> - of_node_put(panel_node);
> -
> dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
> if (!dp)
> return -ENOMEM;
> --
> 1.9.1
>
>