Re: [PATCH V3 6/8] drm/exynos: dp: Modify driver to support bridge chaining

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On Fri, Jun 6, 2014 at 12:40 AM, Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx> wrote:
> exynos_dp supports a simple bridge chain with ptn3460 bridge
> and an LVDS panel attached to it.
> This patch creates the bridge chain with ptn3460 as the head
> of the list and panel_binder being the tail.
>
> Also, DERER_PROBE for exynos_dp is tested with this patch.
>
> Signed-off-by: Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx>
> ---
>  .../devicetree/bindings/video/exynos_dp.txt        |    2 +
>  drivers/gpu/drm/exynos/Kconfig                     |    1 +
>  drivers/gpu/drm/exynos/exynos_dp_core.c            |   39 +++++++++++++++-----
>  drivers/gpu/drm/exynos/exynos_dp_core.h            |    1 +
>  4 files changed, 34 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/video/exynos_dp.txt b/Documentation/devicetree/bindings/video/exynos_dp.txt
> index 53dbccf..0c118ff 100644
> --- a/Documentation/devicetree/bindings/video/exynos_dp.txt
> +++ b/Documentation/devicetree/bindings/video/exynos_dp.txt
> @@ -51,6 +51,8 @@ Required properties for dp-controller:
>                         LANE_COUNT1 = 1, LANE_COUNT2 = 2, LANE_COUNT4 = 4
>         - display-timings: timings for the connected panel as described by
>                 Documentation/devicetree/bindings/video/display-timing.txt
> +       -edp-panel:
> +               phandle for the drm_panel node required by panel_binder.
>
>  Optional properties for dp-controller:
>         -interlaced:
> diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
> index 178d2a9..fd1c070 100644
> --- a/drivers/gpu/drm/exynos/Kconfig
> +++ b/drivers/gpu/drm/exynos/Kconfig
> @@ -52,6 +52,7 @@ config DRM_EXYNOS_DP
>         bool "EXYNOS DRM DP driver support"
>         depends on DRM_EXYNOS_FIMD && ARCH_EXYNOS && (DRM_PTN3460=n || DRM_PTN3460=y || DRM_PTN3460=DRM_EXYNOS)
>         default DRM_EXYNOS
> +       select DRM_PANEL
>         help
>           This enables support for DP device.
>
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
> index 414f5e5..a608f5c 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
> @@ -28,7 +28,9 @@
>  #include <drm/drmP.h>
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_panel.h>
>  #include <drm/bridge/ptn3460.h>
> +#include <drm/bridge/panel_binder.h>
>
>  #include "exynos_drm_drv.h"
>  #include "exynos_dp_core.h"
> @@ -983,7 +985,7 @@ static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
>                 struct drm_encoder *encoder)
>  {
>         struct bridge_init bridge;
> -       struct drm_bridge *bridge_chain = NULL;
> +       struct drm_bridge *bridge_chain = NULL, *next = NULL;
>         bool connector_created = false;
>
>         if (find_bridge("nxp,ptn3460", &bridge)) {
> @@ -991,6 +993,14 @@ static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
>                                                                 bridge.node);
>         }
>
> +       if (dp->edp_panel) {
> +               next = panel_binder_init(dp->drm_dev, encoder, bridge.client,
> +                       bridge.node, dp->edp_panel, DRM_CONNECTOR_POLL_HPD);
> +               if (next)
> +                       connector_created = true;
> +               drm_bridge_add_to_chain(bridge_chain, next);
> +       }
> +
>         return connector_created;
>  }
>
> @@ -1215,16 +1225,10 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
>         struct platform_device *pdev = to_platform_device(dev);
>         struct drm_device *drm_dev = data;
>         struct resource *res;
> -       struct exynos_dp_device *dp;
> +       struct exynos_dp_device *dp = exynos_dp_display.ctx;
>         unsigned int irq_flags;
> -
>         int ret = 0;
>
> -       dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
> -                               GFP_KERNEL);
> -       if (!dp)
> -               return -ENOMEM;
> -
>         dp->dev = &pdev->dev;
>         dp->dpms_mode = DRM_MODE_DPMS_OFF;
>
> @@ -1298,7 +1302,6 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
>         disable_irq(dp->irq);
>
>         dp->drm_dev = drm_dev;
> -       exynos_dp_display.ctx = dp;
>
>         platform_set_drvdata(pdev, &exynos_dp_display);
>
> @@ -1325,6 +1328,9 @@ static const struct component_ops exynos_dp_ops = {
>
>  static int exynos_dp_probe(struct platform_device *pdev)
>  {
> +       struct device *dev = &pdev->dev;
> +       struct device_node *panel_node;
> +       struct exynos_dp_device *dp;
>         int ret;
>
>         ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR,
> @@ -1332,6 +1338,21 @@ static int exynos_dp_probe(struct platform_device *pdev)
>         if (ret)
>                 return ret;
>
> +       dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
> +                               GFP_KERNEL);
> +       if (!dp)
> +               return -ENOMEM;
> +
> +       panel_node = of_parse_phandle(dev->of_node, "edp-panel", 0);
> +       if (panel_node) {
> +               dp->edp_panel = of_drm_find_panel(panel_node);
> +               of_node_put(panel_node);
> +               if (!dp->edp_panel)
> +                       return -EPROBE_DEFER;
> +       }
> +
> +       exynos_dp_display.ctx = dp;
> +
>         ret = component_add(&pdev->dev, &exynos_dp_ops);
>         if (ret)
>                 exynos_drm_component_del(&pdev->dev,
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.h b/drivers/gpu/drm/exynos/exynos_dp_core.h
> index 02cc4f9..26a64d3 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.h
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.h
> @@ -149,6 +149,7 @@ struct exynos_dp_device {
>         struct drm_device       *drm_dev;
>         struct drm_connector    connector;
>         struct drm_encoder      *encoder;
> +       struct drm_panel        *edp_panel;
>         struct clk              *clock;
>         unsigned int            irq;
>         void __iomem            *reg_base;
> --
> 1.7.9.5
>
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