[PATCH 0/3] drm/msm: Use device graph to parse connected panels

[PATCH 0/3] drm/msm: Use device graph to parse connected panels

[Archit Taneja]

drm/msm currently relies on phandles/child nodes to get data about
connected panels to LVDS and DSI. This method has known limitations.

Use device graphs in DT to represent the connections between the encoder
outputs and the panels. Use of_graph helpers in the driver to get the
panel device node.

The usage of device graphs should also simplify management in dual dsi
mode. I haven't tried this out yet, though.

Archit Taneja (3):
  drm/msm: dsi host: add missing of_node_put()
  drm/msm: dsi host: Use device graph parsing to parse connected panel
  drm/msm: mdp4 lvds: get panel node via of graph parsing

 Documentation/devicetree/bindings/drm/msm/dsi.txt | 15 ++++++
 drivers/gpu/drm/msm/dsi/dsi_host.c                | 62 ++++++++++++++++++-----
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c           | 32 ++++++++----
 drivers/gpu/drm/msm/msm_drv.h                     |  1 +
 4 files changed, 87 insertions(+), 23 deletions(-)

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[PATCH 1/3] drm/msm: dsi host: add missing of_node_put()

[Archit Taneja]

Decrement device node refcount if of_get_child_by_name is successfully
called.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index de04009..1751659 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1582,6 +1582,8 @@ int msm_dsi_host_register(struct mipi_dsi_host *host, bool check_defer)
 			node = of_get_child_by_name(msm_host->pdev->dev.of_node,
 							"panel");
 			if (node) {
+				of_node_put(node);
+
 				if (!of_drm_find_panel(node))
 					return -EPROBE_DEFER;
 			}
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[PATCH 2/3] drm/msm: dsi host: Use device graph parsing to parse connected panel

[Archit Taneja]

The dsi host looks for the connected panel node by parsing for a child
named 'panel'. This hierarchy isn't very flexible. The connected
panel is forced to be a child to the dsi host, and hence, a mipi dsi
device. This isn't suitable for dsi devices that don't use mipi dsi
as their control bus.

Follow the of_graph approach of creating ports and endpoints to
represent the connections between the dsi host and the panel connected
to it. In our case, the dsi host will only have one output port, linked
to the panel's input port.

Update DT binding documentation with device graph usage info.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 Documentation/devicetree/bindings/drm/msm/dsi.txt | 15 ++++++
 drivers/gpu/drm/msm/dsi/dsi_host.c                | 64 +++++++++++++++++------
 2 files changed, 63 insertions(+), 16 deletions(-)

diff --git a/Documentation/devicetree/bindings/drm/msm/dsi.txt b/Documentation/devicetree/bindings/drm/msm/dsi.txt
index 6ccd860..c88ec3c 100644
--- a/Documentation/devicetree/bindings/drm/msm/dsi.txt
+++ b/Documentation/devicetree/bindings/drm/msm/dsi.txt
@@ -25,6 +25,9 @@ Required properties:
 - vddio-supply: phandle to vdd-io regulator device node
 - vdda-supply: phandle to vdda regulator device node
 - qcom,dsi-phy: phandle to DSI PHY device node
+- port: DSI controller output port. This contains one endpoint subnode, with its
+  remote-endpoint set to the phandle of the connected panel's endpoint.
+  See Documentation/devicetree/bindings/graph.txt for device graph info.
 
 Optional properties:
 - panel@0: Node of panel connected to this DSI controller.
@@ -101,6 +104,18 @@ Example:
 
 			power-supply = <...>;
 			backlight = <...>;
+
+			port {
+				panel_in: endpoint {
+					remote-endpoint = <&dsi0_out>;
+				};
+			};
+		};
+
+		port {
+			dsi0_out: endpoint {
+				remote-endpoint = <&panel_in>;
+			};
 		};
 	};
 
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 1751659..ab0b23b 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -20,6 +20,7 @@
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/of_irq.h>
+#include <linux/of_graph.h>
 #include <linux/regulator/consumer.h>
 #include <linux/spinlock.h>
 #include <video/mipi_display.h>
@@ -1379,7 +1380,7 @@ static int dsi_host_attach(struct mipi_dsi_host *host,
 	msm_host->format = dsi->format;
 	msm_host->mode_flags = dsi->mode_flags;
 
-	msm_host->panel_node = dsi->dev.of_node;
+	WARN_ON(dsi->dev.of_node != msm_host->panel_node);
 
 	/* Some gpios defined in panel DT need to be controlled by host */
 	ret = dsi_host_init_panel_gpios(msm_host, &dsi->dev);
@@ -1429,6 +1430,46 @@ static struct mipi_dsi_host_ops dsi_host_ops = {
 	.transfer = dsi_host_transfer,
 };
 
+static int msm_dsi_host_parse_dt(struct msm_dsi_host *msm_host)
+{
+	struct device *dev = &msm_host->pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct device_node *endpoint, *panel_node;
+	int ret;
+
+	ret = of_property_read_u32(np, "qcom,dsi-host-index", &msm_host->id);
+	if (ret) {
+		dev_err(dev, "%s: host index not specified, ret=%d\n",
+			__func__, ret);
+		return ret;
+	}
+
+	/*
+	 * get the first endpoint node. in our case, dsi has one output port
+	 * to which the panel is connected.
+	 */
+	endpoint = of_graph_get_next_endpoint(np, NULL);
+	if (IS_ERR(endpoint)) {
+		dev_err(dev, "%s: no valid endpoint\n", __func__);
+		return PTR_ERR(endpoint);
+	}
+
+	of_node_put(endpoint);
+
+	/* get panel node from the output port's endpoint data */
+	panel_node = of_graph_get_remote_port_parent(endpoint);
+	if (IS_ERR(panel_node)) {
+		dev_err(dev, "%s: no valid device\n", __func__);
+		return PTR_ERR(panel_node);
+	}
+
+	of_node_put(panel_node);
+
+	msm_host->panel_node = panel_node;
+
+	return 0;
+}
+
 int msm_dsi_host_init(struct msm_dsi *msm_dsi)
 {
 	struct msm_dsi_host *msm_host = NULL;
@@ -1443,15 +1484,13 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
 		goto fail;
 	}
 
-	ret = of_property_read_u32(pdev->dev.of_node,
-				"qcom,dsi-host-index", &msm_host->id);
+	msm_host->pdev = pdev;
+
+	ret = msm_dsi_host_parse_dt(msm_host);
 	if (ret) {
-		dev_err(&pdev->dev,
-			"%s: host index not specified, ret=%d\n",
-			__func__, ret);
+		pr_err("%s: failed to parse dt\n", __func__);
 		goto fail;
 	}
-	msm_host->pdev = pdev;
 
 	ret = dsi_clk_init(msm_host);
 	if (ret) {
@@ -1559,7 +1598,6 @@ int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
 int msm_dsi_host_register(struct mipi_dsi_host *host, bool check_defer)
 {
 	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
-	struct device_node *node;
 	int ret;
 
 	/* Register mipi dsi host */
@@ -1579,14 +1617,8 @@ int msm_dsi_host_register(struct mipi_dsi_host *host, bool check_defer)
 		 * create framebuffer.
 		 */
 		if (check_defer) {
-			node = of_get_child_by_name(msm_host->pdev->dev.of_node,
-							"panel");
-			if (node) {
-				of_node_put(node);
-
-				if (!of_drm_find_panel(node))
-					return -EPROBE_DEFER;
-			}
+			if (!of_drm_find_panel(msm_host->panel_node))
+				return -EPROBE_DEFER;
 		}
 	}
 
-- 
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[PATCH 3/3] drm/msm: mdp4 lvds: get panel node via of graph parsing

[Archit Taneja]

We currently get the output connected to LVDS by looking for a phandle
called 'qcom,lvds-panel' under the mdp DT node.

Use the more standard of_graph approach to create an lvds output port,
and retrieve the panel node from the port's endpoint data.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c | 32 +++++++++++++++++++++++---------
 drivers/gpu/drm/msm/msm_drv.h           |  1 +
 2 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
index 531e4ac..cf72eda 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
@@ -241,22 +241,36 @@ int mdp4_enable(struct mdp4_kms *mdp4_kms)
 }
 
 #ifdef CONFIG_OF
-static struct drm_panel *detect_panel(struct drm_device *dev, const char *name)
+static struct drm_panel *detect_panel(struct drm_device *dev)
 {
-	struct device_node *n;
+	struct device_node *endpoint, *panel_node;
+	struct device_node *np = dev->dev->of_node;
 	struct drm_panel *panel = NULL;
 
-	n = of_parse_phandle(dev->dev->of_node, name, 0);
-	if (n) {
-		panel = of_drm_find_panel(n);
-		if (!panel)
-			panel = ERR_PTR(-EPROBE_DEFER);
+	endpoint = of_graph_get_next_endpoint(np, NULL);
+	if (IS_ERR(endpoint)) {
+		dev_err(dev->dev, "no valid endpoint\n");
+		return ERR_CAST(endpoint);
 	}
 
+	of_node_put(endpoint);
+
+	panel_node = of_graph_get_remote_port_parent(endpoint);
+	if (IS_ERR(panel_node)) {
+		dev_err(dev->dev, "no valid panel node\n");
+		return ERR_CAST(panel_node);
+	}
+
+	of_node_put(panel_node);
+
+	panel = of_drm_find_panel(panel_node);
+	if (IS_ERR(panel))
+		panel = ERR_PTR(-EPROBE_DEFER);
+
 	return panel;
 }
 #else
-static struct drm_panel *detect_panel(struct drm_device *dev, const char *name)
+static struct drm_panel *detect_panel(struct drm_device *dev)
 {
 	// ??? maybe use a module param to specify which panel is attached?
 }
@@ -294,7 +308,7 @@ static int modeset_init(struct mdp4_kms *mdp4_kms)
 	 * Setup the LCDC/LVDS path: RGB2 -> DMA_P -> LCDC -> LVDS:
 	 */
 
-	panel = detect_panel(dev, "qcom,lvds-panel");
+	panel = detect_panel(dev);
 	if (IS_ERR(panel)) {
 		ret = PTR_ERR(panel);
 		dev_err(dev->dev, "failed to detect LVDS panel: %d\n", ret);
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index e7c5ea1..0cbeb1d 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -30,6 +30,7 @@
 #include <linux/list.h>
 #include <linux/iommu.h>
 #include <linux/types.h>
+#include <linux/of_graph.h>
 #include <asm/sizes.h>
 
 #ifndef CONFIG_OF
-- 
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Re: [PATCH 1/3] drm/msm: dsi host: add missing of_node_put()

[Srinivas Kandagatla]

On 22/06/15 15:54, Archit Taneja wrote:
> Decrement device node refcount if of_get_child_by_name is successfully
> called.
>
> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> ---
>   drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index de04009..1751659 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -1582,6 +1582,8 @@ int msm_dsi_host_register(struct mipi_dsi_host *host, bool check_defer)
>   			node = of_get_child_by_name(msm_host->pdev->dev.of_node,
>   							"panel");
>   			if (node) {
> +				of_node_put(node);
> +

Atleast from the current state of code, It looks like the driver is 
going to refer to the node of_node_put?, So I think this is not the 
right place to have of_node_put.



  >   				if (!of_drm_find_panel(node))
>   					return -EPROBE_DEFER;
>   			}
>

Re: [PATCH 1/3] drm/msm: dsi host: add missing of_node_put()

[Archit Taneja]

On 06/22/2015 09:30 PM, Srinivas Kandagatla wrote:
>
>
> On 22/06/15 15:54, Archit Taneja wrote:
>> Decrement device node refcount if of_get_child_by_name is successfully
>> called.
>>
>> Signed-off-by: Archit Taneja <architt@codeaurora.org>
>> ---
>>   drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c
>> b/drivers/gpu/drm/msm/dsi/dsi_host.c
>> index de04009..1751659 100644
>> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
>> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
>> @@ -1582,6 +1582,8 @@ int msm_dsi_host_register(struct mipi_dsi_host
>> *host, bool check_defer)
>>               node = of_get_child_by_name(msm_host->pdev->dev.of_node,
>>                               "panel");
>>               if (node) {
>> +                of_node_put(node);
>> +
>
> Atleast from the current state of code, It looks like the driver is
> going to refer to the node of_node_put?, So I think this is not the
> right place to have of_node_put.

That's right. I made the same mistake in the later patches too. I'll fix 
these.

Thanks,
Archit

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