Re: [PATCH v5 1/2] drm/fsl-dcu: rework codes to support of_graph dt binding for panel

On 2016-07-14 23:53, Meng Yi wrote:

This patch rework the output code to add of_graph dt binding support for panel device and also keeps the backward compatibility

Signed-off-by: Meng Yi meng.yi@nxp.com

Applied, with Rob's Ack from the earlier documentation only patch for the Documentation part.

-- Stefan

---

Changes in V5: -remove unused variable 'ret' Changes in V4: -simplify return value statements -merge corresponding documentation to this patch Changes in V3: -simplify return value statements Changes in V2: -fix some coding style issue -add fsl_dev->connector.panel check -use fsl_dev->np and drop fsl_dev->dev->of_node

-return 'ret' when fsl_dcu_attach_panel failed

.../devicetree/bindings/display/fsl,dcu.txt | 9 ++- drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c | 2 +- drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h | 3 +- drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 68 +++++++++++++++------- 4 files changed, 57 insertions(+), 25 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/fsl,dcu.txt b/Documentation/devicetree/bindings/display/fsl,dcu.txt index ae55cde..63ec2a6 100644 --- a/Documentation/devicetree/bindings/display/fsl,dcu.txt +++ b/Documentation/devicetree/bindings/display/fsl,dcu.txt @@ -12,7 +12,7 @@ Required properties:

• clock-names: Should be "dcu" and "pix" See ../clocks/clock-bindings.txt for details.
• big-endian Boolean property, LS1021A DCU registers are big-endian.

-- fsl,panel: The phandle to panel node. +- port Video port for the panel output

Optional properties:

• fsl,tcon: The phandle to the timing controller node.

@@ -24,6 +24,11 @@ dcu: dcu@2ce0000 { clocks = <&platform_clk 0>, <&platform_clk 0>; clock-names = "dcu", "pix"; big-endian;

• fsl,panel = <&panel>; fsl,tcon = <&tcon>;

• port {

• dcu_out: endpoint {
  

• 	remote-endpoint = <&panel_out>;
  

•     };
  

• };

}; diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c index a6e4cd5..d9d6cc1 100644 --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c @@ -43,7 +43,7 @@ int fsl_dcu_drm_modeset_init(struct fsl_dcu_drm_device *fsl_dev) if (ret) goto err;

• ret = fsl_dcu_drm_connector_create(fsl_dev, &fsl_dev->encoder);

• ret = fsl_dcu_create_outputs(fsl_dev); if (ret) goto err;

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h index 7093109..5a7b88e 100644 --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h @@ -25,9 +25,8 @@ to_fsl_dcu_connector(struct drm_connector *con) : NULL; }

-int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,

• 		 struct drm_encoder *encoder);
  

int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev, struct drm_crtc *crtc); +int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev);

#endif /* __FSL_DCU_DRM_CONNECTOR_H__ */ diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c index 0b0989e..ba1edb1 100644 --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c @@ -10,6 +10,7 @@ */

#include <linux/backlight.h> +#include <linux/of_graph.h>

#include <drm/drmP.h> #include <drm/drm_atomic_helper.h> @@ -132,12 +133,12 @@ static const struct drm_connector_helper_funcs connector_helper_funcs = { .mode_valid = fsl_dcu_drm_connector_mode_valid, };

-int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,

• 		 struct drm_encoder *encoder)
  

+static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,

• 		 struct drm_panel *panel)
  

{

• struct drm_encoder *encoder = &fsl_dev->encoder; struct drm_connector *connector = &fsl_dev->connector.base; struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;

• struct device_node *panel_node; int ret;

  fsl_dev->connector.encoder = encoder;

@@ -161,21 +162,7 @@ int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev, mode_config->dpms_property, DRM_MODE_DPMS_OFF);

• panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
• if (!panel_node) {

• dev_err(fsl_dev->dev, "fsl,panel property not found\n");
  

• ret = -ENODEV;
  

• goto err_sysfs;
  

• }
• fsl_dev->connector.panel = of_drm_find_panel(panel_node);
• if (!fsl_dev->connector.panel) {

• ret = -EPROBE_DEFER;
  

• goto err_panel;
  

• }
• of_node_put(panel_node);
• ret = drm_panel_attach(fsl_dev->connector.panel, connector);

• ret = drm_panel_attach(panel, connector); if (ret) { dev_err(fsl_dev->dev, "failed to attach panel\n"); goto err_sysfs;

@@ -183,11 +170,52 @@ int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,

return 0;

-err_panel:

• of_node_put(panel_node);

err_sysfs: drm_connector_unregister(connector); err_cleanup: drm_connector_cleanup(connector); return ret; }

+static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,

• 		    const struct of_endpoint *ep)
  

+{

• struct device_node *np;
• np = of_graph_get_remote_port_parent(ep->local_node);
• fsl_dev->connector.panel = of_drm_find_panel(np);
• of_node_put(np);
• if (fsl_dev->connector.panel)

• return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
  

• return -ENODEV;

+}

+int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev) +{

• struct of_endpoint ep;
• struct device_node *ep_node, *panel_node;
• int ret;
• /* This is for backward compatibility */
• panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
• if (panel_node) {

• fsl_dev->connector.panel = of_drm_find_panel(panel_node);
  

• of_node_put(panel_node);
  

• if (!fsl_dev->connector.panel)
  

• 	return -EPROBE_DEFER;
  

• return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
  

• }
• ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL);
• if (!ep_node)

• return -ENODEV;
  

• ret = of_graph_parse_endpoint(ep_node, &ep);
• of_node_put(ep_node);
• if (ret)

• return -ENODEV;
  

• return fsl_dcu_attach_endpoint(fsl_dev, &ep);

+}