From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
aarch64-laptops@lists.linaro.org
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Vasily Khoruzhick <anarsoul@gmail.com>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Jeffrey Hugo <jhugo@codeaurora.org>,
Rob Clark <robdclark@chromium.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>, Sean Paul <sean@poorly.run>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH 2/4] drm/of: add support to find any enabled endpoint
Date: Sat, 7 Dec 2019 12:35:51 -0800 [thread overview]
Message-ID: <20191207203553.286017-3-robdclark@gmail.com> (raw)
In-Reply-To: <20191207203553.286017-1-robdclark@gmail.com>
From: Rob Clark <robdclark@chromium.org>
To handle the case where there are multiple panel endpoints, only one of
which is enabled/installed, add support for a wildcard endpoint value to
request finding whichever endpoint is enabled.
Signed-off-by: Rob Clark <robdclark@chromium.org>
---
drivers/gpu/drm/drm_of.c | 41 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 0ca58803ba46..2baf44e401b8 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -219,11 +219,44 @@ int drm_of_encoder_active_endpoint(struct device_node *node,
}
EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
+static int find_enabled_endpoint(const struct device_node *node, u32 port)
+{
+ struct device_node *endpoint_node, *remote;
+ u32 endpoint = 0;
+
+ for (endpoint = 0; ; endpoint++) {
+ endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint);
+ if (!endpoint_node) {
+ pr_debug("No more endpoints!\n");
+ return -ENODEV;
+ }
+
+ remote = of_graph_get_remote_port_parent(endpoint_node);
+ of_node_put(endpoint_node);
+ if (!remote) {
+ pr_debug("no valid remote node\n");
+ continue;
+ }
+
+ if (!of_device_is_available(remote)) {
+ pr_debug("not available for remote node\n");
+ of_node_put(remote);
+ continue;
+ }
+
+ pr_debug("found enabled endpoint %d for %s\n", endpoint, remote->name);
+ of_node_put(remote);
+ return endpoint;
+ }
+
+ return -ENODEV;
+}
+
/**
* drm_of_find_panel_or_bridge - return connected panel or bridge device
* @np: device tree node containing encoder output ports
* @port: port in the device tree node
- * @endpoint: endpoint in the device tree node
+ * @endpoint: endpoint in the device tree node, or -1 to find an enabled endpoint
* @panel: pointer to hold returned drm_panel
* @bridge: pointer to hold returned drm_bridge
*
@@ -246,6 +279,12 @@ int drm_of_find_panel_or_bridge(const struct device_node *np,
if (panel)
*panel = NULL;
+ if (endpoint == -1) {
+ endpoint = find_enabled_endpoint(np, port);
+ if (endpoint < 0)
+ return endpoint;
+ }
+
remote = of_graph_get_remote_node(np, port, endpoint);
if (!remote)
return -ENODEV;
--
2.23.0
next prev parent reply other threads:[~2019-12-07 20:36 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-07 20:35 [PATCH 0/4] drm+dt: multi panel selection and yoga c630 display Rob Clark
2019-12-07 20:35 ` [PATCH 1/4] dt-bindings: display: panel: document panel-id Rob Clark
2019-12-07 21:13 ` Sam Ravnborg
2019-12-07 21:34 ` Rob Clark
2019-12-08 9:39 ` Sam Ravnborg
2019-12-08 14:45 ` Laurent Pinchart
2019-12-08 16:50 ` Rob Clark
2019-12-08 18:27 ` Laurent Pinchart
2019-12-08 21:23 ` Rob Clark
2019-12-09 11:05 ` Laurent Pinchart
2019-12-09 15:31 ` Rob Herring
2019-12-09 15:57 ` Rob Clark
2019-12-07 20:35 ` Rob Clark [this message]
2019-12-08 9:31 ` [PATCH 2/4] drm/of: add support to find any enabled endpoint Sam Ravnborg
2019-12-07 20:35 ` [PATCH 3/4] drm/bridge: ti-sn65dsi86: " Rob Clark
2019-12-07 20:35 ` [PATCH 4/4] arm64: dts: qcom: c630: Enable display Rob Clark
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