/* * Samsung SoC DP (Display Port) interface driver. * * Copyright (C) 2012 Samsung Electronics Co., Ltd. * Author: Jingoo Han <jg1.han@samsung.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/err.h> #include <linux/clk.h> #include <linux/of_graph.h> #include <linux/component.h> #include <video/of_display_timing.h> #include <video/of_videomode.h> #include <video/videomode.h> #include <drm/drmP.h> #include <drm/drm_crtc.h> #include <drm/drm_crtc_helper.h> #include <drm/drm_panel.h> #include <drm/bridge/analogix_dp.h> #include <drm/exynos_drm.h> #include "exynos_drm_crtc.h" #define to_dp(nm) container_of(nm, struct exynos_dp_device, nm) struct exynos_dp_device { struct drm_encoder encoder; struct drm_connector *connector; struct drm_bridge *ptn_bridge; struct drm_device *drm_dev; struct device *dev; struct videomode vm; struct analogix_dp_plat_data plat_data; }; int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data, bool enable) { struct exynos_dp_device *dp = to_dp(plat_data); struct drm_encoder *encoder = &dp->encoder; if (!encoder->crtc) return -EPERM; exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable); return 0; } static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data) { return exynos_dp_crtc_clock_enable(plat_data, true); } static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data) { return exynos_dp_crtc_clock_enable(plat_data, false); } static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data) { struct exynos_dp_device *dp = to_dp(plat_data); struct drm_connector *connector = dp->connector; struct drm_display_mode *mode; int num_modes = 0; if (dp->plat_data.panel) return num_modes; mode = drm_mode_create(connector->dev); if (!mode) { DRM_ERROR("failed to create a new display mode.\n"); return num_modes; } drm_display_mode_from_videomode(&dp->vm, mode); connector->display_info.width_mm = mode->width_mm; connector->display_info.height_mm = mode->height_mm; mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; drm_mode_set_name(mode); drm_mode_probed_add(connector, mode); return num_modes + 1; } static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data, struct drm_bridge *bridge, struct drm_connector *connector) { struct exynos_dp_device *dp = to_dp(plat_data); struct drm_encoder *encoder = &dp->encoder; int ret; drm_connector_register(connector); dp->connector = connector; /* Pre-empt DP connector creation if there's a bridge */ if (dp->ptn_bridge) { bridge->next = dp->ptn_bridge; dp->ptn_bridge->encoder = encoder; ret = drm_bridge_attach(encoder->dev, dp->ptn_bridge); if (ret) { DRM_ERROR("Failed to attach bridge to drm\n"); bridge->next = NULL; return ret; } } return 0; } static void exynos_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode, struct drm_display_mode *adjusted_mode) { } static void exynos_dp_nop(struct drm_encoder *encoder) { /* do nothing */ } static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = { .mode_set = exynos_dp_mode_set, .enable = exynos_dp_nop, .disable = exynos_dp_nop, }; static const struct drm_encoder_funcs exynos_dp_encoder_funcs = { .destroy = drm_encoder_cleanup, }; static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp) { int ret; ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE); if (ret) { DRM_ERROR("failed: of_get_videomode() : %d\n", ret); return ret; } return 0; } static int exynos_dp_bind(struct device *dev, struct device *master, void *data) { struct exynos_dp_device *dp = dev_get_drvdata(dev); struct drm_encoder *encoder = &dp->encoder; struct drm_device *drm_dev = data; int pipe, ret; /* * Just like the probe function said, we don't need the * device drvrate anymore, we should leave the charge to * analogix dp driver, set the device drvdata to NULL. */ dev_set_drvdata(dev, NULL); dp->dev = dev; dp->drm_dev = drm_dev; dp->plat_data.dev_type = EXYNOS_DP; dp->plat_data.power_on = exynos_dp_poweron; dp->plat_data.power_off = exynos_dp_poweroff; dp->plat_data.attach = exynos_dp_bridge_attach; dp->plat_data.get_modes = exynos_dp_get_modes; if (!dp->plat_data.panel && !dp->ptn_bridge) { ret = exynos_dp_dt_parse_panel(dp); if (ret) return ret; } pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev, EXYNOS_DISPLAY_TYPE_LCD); if (pipe < 0) return pipe; encoder->possible_crtcs = 1 << pipe; DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs); drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, DRM_MODE_ENCODER_TMDS, NULL); drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); dp->plat_data.encoder = encoder; return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data); } static void exynos_dp_unbind(struct device *dev, struct device *master, void *data) { return analogix_dp_unbind(dev, master, data); } static const struct component_ops exynos_dp_ops = { .bind = exynos_dp_bind, .unbind = exynos_dp_unbind, }; static int exynos_dp_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = NULL, *endpoint = NULL; struct exynos_dp_device *dp; dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), GFP_KERNEL); if (!dp) return -ENOMEM; /* * We just use the drvdata until driver run into component * add function, and then we would set drvdata to null, so * that analogix dp driver would take charge of the drvdata. */ platform_set_drvdata(pdev, dp); /* This is for the backward compatibility. */ np = of_parse_phandle(dev->of_node, "panel", 0); if (np) { dp->plat_data.panel = of_drm_find_panel(np); of_node_put(np); if (!dp->plat_data.panel) return -EPROBE_DEFER; goto out; } endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); if (endpoint) { np = of_graph_get_remote_port_parent(endpoint); if (np) { /* The remote port can be either a panel or a bridge */ dp->plat_data.panel = of_drm_find_panel(np); if (!dp->plat_data.panel) { dp->ptn_bridge = of_drm_find_bridge(np); if (!dp->ptn_bridge) { of_node_put(np); return -EPROBE_DEFER; } } of_node_put(np); } else { DRM_ERROR("no remote endpoint device node found.\n"); return -EINVAL; } } else { DRM_ERROR("no port endpoint subnode found.\n"); return -EINVAL; } out: return component_add(&pdev->dev, &exynos_dp_ops); } static int exynos_dp_remove(struct platform_device *pdev) { component_del(&pdev->dev, &exynos_dp_ops); return 0; } #ifdef CONFIG_PM static int exynos_dp_suspend(struct device *dev) { return analogix_dp_suspend(dev); } static int exynos_dp_resume(struct device *dev) { return analogix_dp_resume(dev); } #endif static const struct dev_pm_ops exynos_dp_pm_ops = { SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) }; static const struct of_device_id exynos_dp_match[] = { { .compatible = "samsung,exynos5-dp" }, {}, }; MODULE_DEVICE_TABLE(of, exynos_dp_match); struct platform_driver dp_driver = { .probe = exynos_dp_probe, .remove = exynos_dp_remove, .driver = { .name = "exynos-dp", .owner = THIS_MODULE, .pm = &exynos_dp_pm_ops, .of_match_table = exynos_dp_match, }, }; MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); MODULE_LICENSE("GPL v2");