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1// SPDX-License-Identifier: GPL-2.02/*3 * ZynqMP DisplayPort Subsystem Driver4 *5 * Copyright (C) 2017 - 2020 Xilinx, Inc.6 *7 * Authors:8 * - Hyun Woo Kwon <hyun.kwon@xilinx.com>9 * - Laurent Pinchart <laurent.pinchart@ideasonboard.com>10 */11 12#include <linux/clk.h>13#include <linux/dma-mapping.h>14#include <linux/module.h>15#include <linux/of_graph.h>16#include <linux/of_reserved_mem.h>17#include <linux/platform_device.h>18#include <linux/pm_runtime.h>19#include <linux/slab.h>20 21#include <drm/drm_atomic_helper.h>22#include <drm/drm_bridge.h>23#include <drm/drm_modeset_helper.h>24#include <drm/drm_module.h>25 26#include "zynqmp_disp.h"27#include "zynqmp_dp.h"28#include "zynqmp_dpsub.h"29#include "zynqmp_kms.h"30 31/* -----------------------------------------------------------------------------32 * Power Management33 */34 35static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)36{37	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);38 39	if (!dpsub->drm)40		return 0;41 42	return drm_mode_config_helper_suspend(&dpsub->drm->dev);43}44 45static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)46{47	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);48 49	if (!dpsub->drm)50		return 0;51 52	return drm_mode_config_helper_resume(&dpsub->drm->dev);53}54 55static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {56	SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)57};58 59/* -----------------------------------------------------------------------------60 * DPSUB Configuration61 */62 63/**64 * zynqmp_dpsub_audio_enabled - If the audio is enabled65 * @dpsub: DisplayPort subsystem66 *67 * Return if the audio is enabled depending on the audio clock.68 *69 * Return: true if audio is enabled, or false.70 */71bool zynqmp_dpsub_audio_enabled(struct zynqmp_dpsub *dpsub)72{73	return !!dpsub->aud_clk;74}75 76/**77 * zynqmp_dpsub_get_audio_clk_rate - Get the current audio clock rate78 * @dpsub: DisplayPort subsystem79 *80 * Return: the current audio clock rate.81 */82unsigned int zynqmp_dpsub_get_audio_clk_rate(struct zynqmp_dpsub *dpsub)83{84	if (zynqmp_dpsub_audio_enabled(dpsub))85		return 0;86	return clk_get_rate(dpsub->aud_clk);87}88 89/* -----------------------------------------------------------------------------90 * Probe & Remove91 */92 93static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)94{95	int ret;96 97	dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");98	if (IS_ERR(dpsub->apb_clk))99		return PTR_ERR(dpsub->apb_clk);100 101	ret = clk_prepare_enable(dpsub->apb_clk);102	if (ret) {103		dev_err(dpsub->dev, "failed to enable the APB clock\n");104		return ret;105	}106 107	/*108	 * Try the live PL video clock, and fall back to the PS clock if the109	 * live PL video clock isn't valid.110	 */111	dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_live_video_in_clk");112	if (!IS_ERR(dpsub->vid_clk))113		dpsub->vid_clk_from_ps = false;114	else if (PTR_ERR(dpsub->vid_clk) == -EPROBE_DEFER)115		return PTR_ERR(dpsub->vid_clk);116 117	if (IS_ERR_OR_NULL(dpsub->vid_clk)) {118		dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_vtc_pixel_clk_in");119		if (IS_ERR(dpsub->vid_clk)) {120			dev_err(dpsub->dev, "failed to init any video clock\n");121			return PTR_ERR(dpsub->vid_clk);122		}123		dpsub->vid_clk_from_ps = true;124	}125 126	/*127	 * Try the live PL audio clock, and fall back to the PS clock if the128	 * live PL audio clock isn't valid. Missing audio clock disables audio129	 * but isn't an error.130	 */131	dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_live_audio_aclk");132	if (!IS_ERR(dpsub->aud_clk)) {133		dpsub->aud_clk_from_ps = false;134		return 0;135	}136 137	dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_aud_clk");138	if (!IS_ERR(dpsub->aud_clk)) {139		dpsub->aud_clk_from_ps = true;140		return 0;141	}142 143	dev_info(dpsub->dev, "audio disabled due to missing clock\n");144	return 0;145}146 147static int zynqmp_dpsub_parse_dt(struct zynqmp_dpsub *dpsub)148{149	struct device_node *np;150	unsigned int i;151 152	/*153	 * For backward compatibility with old device trees that don't contain154	 * ports, consider that only the DP output port is connected if no155	 * ports child no exists.156	 */157	np = of_get_child_by_name(dpsub->dev->of_node, "ports");158	of_node_put(np);159	if (!np) {160		dev_warn(dpsub->dev, "missing ports, update DT bindings\n");161		dpsub->connected_ports = BIT(ZYNQMP_DPSUB_PORT_OUT_DP);162		dpsub->dma_enabled = true;163		return 0;164	}165 166	/* Check which ports are connected. */167	for (i = 0; i < ZYNQMP_DPSUB_NUM_PORTS; ++i) {168		struct device_node *np;169 170		np = of_graph_get_remote_node(dpsub->dev->of_node, i, -1);171		if (np) {172			dpsub->connected_ports |= BIT(i);173			of_node_put(np);174		}175	}176 177	/* Sanity checks. */178	if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) &&179	    (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {180		dev_err(dpsub->dev, "only one live video input is supported\n");181		return -EINVAL;182	}183 184	if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) ||185	    (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {186		if (dpsub->vid_clk_from_ps) {187			dev_err(dpsub->dev,188				"live video input requires PL clock\n");189			return -EINVAL;190		}191	} else {192		dpsub->dma_enabled = true;193	}194 195	if (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_AUDIO))196		dev_warn(dpsub->dev, "live audio unsupported, ignoring\n");197 198	if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_VIDEO)) ||199	    (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_AUDIO)))200		dev_warn(dpsub->dev, "output to PL unsupported, ignoring\n");201 202	if (!(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_DP))) {203		dev_err(dpsub->dev, "DP output port not connected\n");204		return -EINVAL;205	}206 207	return 0;208}209 210void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub)211{212	kfree(dpsub->disp);213	kfree(dpsub->dp);214	kfree(dpsub);215}216 217static int zynqmp_dpsub_probe(struct platform_device *pdev)218{219	struct zynqmp_dpsub *dpsub;220	int ret;221 222	/* Allocate private data. */223	dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL);224	if (!dpsub)225		return -ENOMEM;226 227	dpsub->dev = &pdev->dev;228	platform_set_drvdata(pdev, dpsub);229 230	ret = dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));231	if (ret)232		return ret;233 234	/* Try the reserved memory. Proceed if there's none. */235	of_reserved_mem_device_init(&pdev->dev);236 237	ret = zynqmp_dpsub_init_clocks(dpsub);238	if (ret < 0)239		goto err_mem;240 241	ret = zynqmp_dpsub_parse_dt(dpsub);242	if (ret < 0)243		goto err_mem;244 245	pm_runtime_enable(&pdev->dev);246 247	/*248	 * DP should be probed first so that the zynqmp_disp can set the output249	 * format accordingly.250	 */251	ret = zynqmp_dp_probe(dpsub);252	if (ret)253		goto err_pm;254 255	ret = zynqmp_disp_probe(dpsub);256	if (ret)257		goto err_dp;258 259	drm_bridge_add(dpsub->bridge);260 261	if (dpsub->dma_enabled) {262		ret = zynqmp_dpsub_drm_init(dpsub);263		if (ret)264			goto err_disp;265	}266 267	dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");268 269	return 0;270 271err_disp:272	drm_bridge_remove(dpsub->bridge);273	zynqmp_disp_remove(dpsub);274err_dp:275	zynqmp_dp_remove(dpsub);276err_pm:277	pm_runtime_disable(&pdev->dev);278	clk_disable_unprepare(dpsub->apb_clk);279err_mem:280	of_reserved_mem_device_release(&pdev->dev);281	if (!dpsub->drm)282		zynqmp_dpsub_release(dpsub);283	return ret;284}285 286static void zynqmp_dpsub_remove(struct platform_device *pdev)287{288	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);289 290	if (dpsub->drm)291		zynqmp_dpsub_drm_cleanup(dpsub);292 293	drm_bridge_remove(dpsub->bridge);294	zynqmp_disp_remove(dpsub);295	zynqmp_dp_remove(dpsub);296 297	pm_runtime_disable(&pdev->dev);298	clk_disable_unprepare(dpsub->apb_clk);299	of_reserved_mem_device_release(&pdev->dev);300 301	if (!dpsub->drm)302		zynqmp_dpsub_release(dpsub);303}304 305static void zynqmp_dpsub_shutdown(struct platform_device *pdev)306{307	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);308 309	if (!dpsub->drm)310		return;311 312	drm_atomic_helper_shutdown(&dpsub->drm->dev);313}314 315static const struct of_device_id zynqmp_dpsub_of_match[] = {316	{ .compatible = "xlnx,zynqmp-dpsub-1.7", },317	{ /* end of table */ },318};319MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);320 321static struct platform_driver zynqmp_dpsub_driver = {322	.probe			= zynqmp_dpsub_probe,323	.remove_new		= zynqmp_dpsub_remove,324	.shutdown		= zynqmp_dpsub_shutdown,325	.driver			= {326		.name		= "zynqmp-dpsub",327		.pm		= &zynqmp_dpsub_pm_ops,328		.of_match_table	= zynqmp_dpsub_of_match,329	},330};331 332drm_module_platform_driver(zynqmp_dpsub_driver);333 334MODULE_AUTHOR("Xilinx, Inc.");335MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");336MODULE_LICENSE("GPL v2");337