Add support for bridge chips connected externally to the i.MX DISP0/DISP1 DPI interfaces.

Signed-off-by: Philipp Zabel p.zabel@pengutronix.de --- Changes since v1: rebased onto imx-drm/next with atomic modeset changes --- drivers/gpu/drm/imx/parallel-display.c | 50 ++++++++++++++++++++++++++++------ 1 file changed, 41 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c index 0b96653..74b0ac0 100644 --- a/drivers/gpu/drm/imx/parallel-display.c +++ b/drivers/gpu/drm/imx/parallel-display.c @@ -36,6 +36,7 @@ struct imx_parallel_display { u32 bus_flags; struct drm_display_mode mode; struct drm_panel *panel; + struct drm_bridge *bridge; };

static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c) @@ -185,15 +186,29 @@ static int imx_pd_register(struct drm_device *drm, drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);

- drm_connector_helper_add(&imxpd->connector, - &imx_pd_connector_helper_funcs); - drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs, - DRM_MODE_CONNECTOR_VGA); + if (!imxpd->bridge) { + drm_connector_helper_add(&imxpd->connector, + &imx_pd_connector_helper_funcs); + drm_connector_init(drm, &imxpd->connector, + &imx_pd_connector_funcs, + DRM_MODE_CONNECTOR_VGA); + }

if (imxpd->panel) drm_panel_attach(imxpd->panel, &imxpd->connector);

- drm_mode_connector_attach_encoder(&imxpd->connector, encoder); + if (imxpd->bridge) { + imxpd->bridge->encoder = encoder; + encoder->bridge = imxpd->bridge; + ret = drm_bridge_attach(drm, imxpd->bridge); + if (ret < 0) { + dev_err(imxpd->dev, "failed to attach bridge: %d\n", + ret); + return ret; + } + } else { + drm_mode_connector_attach_encoder(&imxpd->connector, encoder); + }

return 0; } @@ -236,13 +251,30 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data) struct device_node *remote;

remote = of_graph_get_remote_port_parent(ep); + if (!remote) { + dev_warn(dev, "endpoint %s not connected\n", + ep->full_name); + of_node_put(ep); + return -ENODEV; + } of_node_put(ep); - if (remote) { - imxpd->panel = of_drm_find_panel(remote); - of_node_put(remote); + + imxpd->panel = of_drm_find_panel(remote); + if (imxpd->panel) { + dev_dbg(dev, "found panel %s\n", remote->full_name); + } else { + imxpd->bridge = of_drm_find_bridge(remote); + if (imxpd->bridge) + dev_dbg(dev, "found bridge %s\n", + remote->full_name); } - if (!imxpd->panel) + if (!imxpd->panel && !imxpd->bridge) { + dev_dbg(dev, "waiting for panel or bridge %s\n", + remote->full_name); + of_node_put(remote); return -EPROBE_DEFER; + } + of_node_put(remote); }

imxpd->dev = dev;