diff options
Diffstat (limited to 'drivers/gpu/drm/rcar-du/rcar_du_encoder.c')
| -rw-r--r-- | drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c new file mode 100644 index 000000000..7ecec7b04 --- /dev/null +++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c @@ -0,0 +1,137 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * R-Car Display Unit Encoder + * + * Copyright (C) 2013-2014 Renesas Electronics Corporation + * + * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) + */ + +#include <linux/export.h> +#include <linux/of.h> + +#include <drm/drm_bridge.h> +#include <drm/drm_bridge_connector.h> +#include <drm/drm_panel.h> + +#include "rcar_du_drv.h" +#include "rcar_du_encoder.h" +#include "rcar_lvds.h" + +/* ----------------------------------------------------------------------------- + * Encoder + */ + +static unsigned int rcar_du_encoder_count_ports(struct device_node *node) +{ + struct device_node *ports; + struct device_node *port; + unsigned int num_ports = 0; + + ports = of_get_child_by_name(node, "ports"); + if (!ports) + ports = of_node_get(node); + + for_each_child_of_node(ports, port) { + if (of_node_name_eq(port, "port")) + num_ports++; + } + + of_node_put(ports); + + return num_ports; +} + +static const struct drm_encoder_funcs rcar_du_encoder_funcs = { +}; + +int rcar_du_encoder_init(struct rcar_du_device *rcdu, + enum rcar_du_output output, + struct device_node *enc_node) +{ + struct rcar_du_encoder *renc; + struct drm_connector *connector; + struct drm_bridge *bridge; + int ret; + + /* + * Locate the DRM bridge from the DT node. For the DPAD outputs, if the + * DT node has a single port, assume that it describes a panel and + * create a panel bridge. + */ + if ((output == RCAR_DU_OUTPUT_DPAD0 || + output == RCAR_DU_OUTPUT_DPAD1) && + rcar_du_encoder_count_ports(enc_node) == 1) { + struct drm_panel *panel = of_drm_find_panel(enc_node); + + if (IS_ERR(panel)) + return PTR_ERR(panel); + + bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel, + DRM_MODE_CONNECTOR_DPI); + if (IS_ERR(bridge)) + return PTR_ERR(bridge); + } else { + bridge = of_drm_find_bridge(enc_node); + if (!bridge) + return -EPROBE_DEFER; + + if (output == RCAR_DU_OUTPUT_LVDS0 || + output == RCAR_DU_OUTPUT_LVDS1) + rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge; + + if (output == RCAR_DU_OUTPUT_DSI0 || + output == RCAR_DU_OUTPUT_DSI1) + rcdu->dsi[output - RCAR_DU_OUTPUT_DSI0] = bridge; + } + + /* + * Create and initialize the encoder. On Gen3, skip the LVDS1 output if + * the LVDS1 encoder is used as a companion for LVDS0 in dual-link + * mode, or any LVDS output if it isn't connected. The latter may happen + * on D3 or E3 as the LVDS encoders are needed to provide the pixel + * clock to the DU, even when the LVDS outputs are not used. + */ + if (rcdu->info->gen >= 3) { + if (output == RCAR_DU_OUTPUT_LVDS1 && + rcar_lvds_dual_link(bridge)) + return -ENOLINK; + + if ((output == RCAR_DU_OUTPUT_LVDS0 || + output == RCAR_DU_OUTPUT_LVDS1) && + !rcar_lvds_is_connected(bridge)) + return -ENOLINK; + } + + dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n", + enc_node, rcar_du_output_name(output)); + + renc = drmm_encoder_alloc(&rcdu->ddev, struct rcar_du_encoder, base, + &rcar_du_encoder_funcs, DRM_MODE_ENCODER_NONE, + NULL); + if (IS_ERR(renc)) + return PTR_ERR(renc); + + renc->output = output; + + /* Attach the bridge to the encoder. */ + ret = drm_bridge_attach(&renc->base, bridge, NULL, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); + if (ret) { + dev_err(rcdu->dev, + "failed to attach bridge %pOF for output %s (%d)\n", + bridge->of_node, rcar_du_output_name(output), ret); + return ret; + } + + /* Create the connector for the chain of bridges. */ + connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base); + if (IS_ERR(connector)) { + dev_err(rcdu->dev, + "failed to created connector for output %s (%ld)\n", + rcar_du_output_name(output), PTR_ERR(connector)); + return PTR_ERR(connector); + } + + return drm_connector_attach_encoder(connector, &renc->base); +} |