/* * Exynos DRM Parallel output support. * * Copyright (c) 2014 Samsung Electronics Co., Ltd * * Contacts: Andrzej Hajda <a.hajda@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <drm/drmP.h> #include <drm/drm_crtc_helper.h> #include <drm/drm_panel.h> #include <linux/regulator/consumer.h> #include <video/of_videomode.h> #include <video/videomode.h> #include "exynos_drm_drv.h" struct exynos_dpi { struct device *dev; struct device_node *panel_node; struct drm_panel *panel; struct drm_connector connector; struct drm_encoder *encoder; struct videomode *vm; int dpms_mode; }; #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector) static enum drm_connector_status exynos_dpi_detect(struct drm_connector *connector, bool force) { struct exynos_dpi *ctx = connector_to_dpi(connector); if (ctx->panel && !ctx->panel->connector) drm_panel_attach(ctx->panel, &ctx->connector); return connector_status_connected; } static void exynos_dpi_connector_destroy(struct drm_connector *connector) { drm_connector_unregister(connector); drm_connector_cleanup(connector); } static struct drm_connector_funcs exynos_dpi_connector_funcs = { .dpms = drm_helper_connector_dpms, .detect = exynos_dpi_detect, .fill_modes = drm_helper_probe_single_connector_modes, .destroy = exynos_dpi_connector_destroy, }; static int exynos_dpi_get_modes(struct drm_connector *connector) { struct exynos_dpi *ctx = connector_to_dpi(connector); /* fimd timings gets precedence over panel modes */ if (ctx->vm) { struct drm_display_mode *mode; mode = drm_mode_create(connector->dev); if (!mode) { DRM_ERROR("failed to create a new display mode\n"); return 0; } drm_display_mode_from_videomode(ctx->vm, mode); mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; drm_mode_probed_add(connector, mode); return 1; } if (ctx->panel) return ctx->panel->funcs->get_modes(ctx->panel); return 0; } static struct drm_encoder * exynos_dpi_best_encoder(struct drm_connector *connector) { struct exynos_dpi *ctx = connector_to_dpi(connector); return ctx->encoder; } static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = { .get_modes = exynos_dpi_get_modes, .best_encoder = exynos_dpi_best_encoder, }; static int exynos_dpi_create_connector(struct exynos_drm_display *display, struct drm_encoder *encoder) { struct exynos_dpi *ctx = display->ctx; struct drm_connector *connector = &ctx->connector; int ret; ctx->encoder = encoder; connector->polled = DRM_CONNECTOR_POLL_HPD; ret = drm_connector_init(encoder->dev, connector, &exynos_dpi_connector_funcs, DRM_MODE_CONNECTOR_VGA); if (ret) { DRM_ERROR("failed to initialize connector with drm\n"); return ret; } drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs); drm_connector_register(connector); drm_mode_connector_attach_encoder(connector, encoder); return 0; } static void exynos_dpi_poweron(struct exynos_dpi *ctx) { if (ctx->panel) { drm_panel_prepare(ctx->panel); drm_panel_enable(ctx->panel); } } static void exynos_dpi_poweroff(struct exynos_dpi *ctx) { if (ctx->panel) { drm_panel_disable(ctx->panel); drm_panel_unprepare(ctx->panel); } } static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode) { struct exynos_dpi *ctx = display->ctx; switch (mode) { case DRM_MODE_DPMS_ON: if (ctx->dpms_mode != DRM_MODE_DPMS_ON) exynos_dpi_poweron(ctx); break; case DRM_MODE_DPMS_STANDBY: case DRM_MODE_DPMS_SUSPEND: case DRM_MODE_DPMS_OFF: if (ctx->dpms_mode == DRM_MODE_DPMS_ON) exynos_dpi_poweroff(ctx); break; default: break; } ctx->dpms_mode = mode; } static struct exynos_drm_display_ops exynos_dpi_display_ops = { .create_connector = exynos_dpi_create_connector, .dpms = exynos_dpi_dpms }; static struct exynos_drm_display exynos_dpi_display = { .type = EXYNOS_DISPLAY_TYPE_LCD, .ops = &exynos_dpi_display_ops, }; /* of_* functions will be removed after merge of of_graph patches */ static struct device_node * of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg) { struct device_node *np; for_each_child_of_node(parent, np) { u32 r; if (!np->name || of_node_cmp(np->name, name)) continue; if (of_property_read_u32(np, "reg", &r) < 0) r = 0; if (reg == r) break; } return np; } static struct device_node *of_graph_get_port_by_reg(struct device_node *parent, u32 reg) { struct device_node *ports, *port; ports = of_get_child_by_name(parent, "ports"); if (ports) parent = ports; port = of_get_child_by_name_reg(parent, "port", reg); of_node_put(ports); return port; } static struct device_node * of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg) { return of_get_child_by_name_reg(port, "endpoint", reg); } static struct device_node * of_graph_get_remote_port_parent(const struct device_node *node) { struct device_node *np; unsigned int depth; np = of_parse_phandle(node, "remote-endpoint", 0); /* Walk 3 levels up only if there is 'ports' node. */ for (depth = 3; depth && np; depth--) { np = of_get_next_parent(np); if (depth == 2 && of_node_cmp(np->name, "ports")) break; } return np; } enum { FIMD_PORT_IN0, FIMD_PORT_IN1, FIMD_PORT_IN2, FIMD_PORT_RGB, FIMD_PORT_WRB, }; static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev) { struct device_node *np, *ep; np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB); if (!np) return NULL; ep = of_graph_get_endpoint_by_reg(np, 0); of_node_put(np); if (!ep) return NULL; np = of_graph_get_remote_port_parent(ep); of_node_put(ep); return np; } static int exynos_dpi_parse_dt(struct exynos_dpi *ctx) { struct device *dev = ctx->dev; struct device_node *dn = dev->of_node; struct device_node *np; ctx->panel_node = exynos_dpi_of_find_panel_node(dev); np = of_get_child_by_name(dn, "display-timings"); if (np) { struct videomode *vm; int ret; of_node_put(np); vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL); if (!vm) return -ENOMEM; ret = of_get_videomode(dn, vm, 0); if (ret < 0) { devm_kfree(dev, vm); return ret; } ctx->vm = vm; return 0; } if (!ctx->panel_node) return -EINVAL; return 0; } struct exynos_drm_display *exynos_dpi_probe(struct device *dev) { struct exynos_dpi *ctx; int ret; ret = exynos_drm_component_add(dev, EXYNOS_DEVICE_TYPE_CONNECTOR, exynos_dpi_display.type); if (ret) return ERR_PTR(ret); ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); if (!ctx) goto err_del_component; ctx->dev = dev; exynos_dpi_display.ctx = ctx; ctx->dpms_mode = DRM_MODE_DPMS_OFF; ret = exynos_dpi_parse_dt(ctx); if (ret < 0) { devm_kfree(dev, ctx); goto err_del_component; } if (ctx->panel_node) { ctx->panel = of_drm_find_panel(ctx->panel_node); if (!ctx->panel) { exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR); return ERR_PTR(-EPROBE_DEFER); } } return &exynos_dpi_display; err_del_component: exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR); return NULL; } int exynos_dpi_remove(struct device *dev) { struct exynos_dpi *ctx = exynos_dpi_display.ctx; exynos_dpi_dpms(&exynos_dpi_display, DRM_MODE_DPMS_OFF); if (ctx->panel) drm_panel_detach(ctx->panel); exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR); return 0; }