1d76271d2SHyun Kwon // SPDX-License-Identifier: GPL-2.0 2d76271d2SHyun Kwon /* 3d76271d2SHyun Kwon * ZynqMP DisplayPort Subsystem Driver 4d76271d2SHyun Kwon * 5d76271d2SHyun Kwon * Copyright (C) 2017 - 2020 Xilinx, Inc. 6d76271d2SHyun Kwon * 7d76271d2SHyun Kwon * Authors: 8d76271d2SHyun Kwon * - Hyun Woo Kwon <hyun.kwon@xilinx.com> 9d76271d2SHyun Kwon * - Laurent Pinchart <laurent.pinchart@ideasonboard.com> 10d76271d2SHyun Kwon */ 11d76271d2SHyun Kwon 12d76271d2SHyun Kwon #include <linux/clk.h> 13d76271d2SHyun Kwon #include <linux/dma-mapping.h> 14d76271d2SHyun Kwon #include <linux/module.h> 1552c2cf14SLaurent Pinchart #include <linux/of_graph.h> 16d76271d2SHyun Kwon #include <linux/of_reserved_mem.h> 17d76271d2SHyun Kwon #include <linux/platform_device.h> 18d76271d2SHyun Kwon #include <linux/pm_runtime.h> 196ca91bb4SLaurent Pinchart #include <linux/slab.h> 20d76271d2SHyun Kwon 21d76271d2SHyun Kwon #include <drm/drm_atomic_helper.h> 22074ef0ceSLaurent Pinchart #include <drm/drm_modeset_helper.h> 23fad54534SJavier Martinez Canillas #include <drm/drm_module.h> 24d76271d2SHyun Kwon 25d76271d2SHyun Kwon #include "zynqmp_disp.h" 26d76271d2SHyun Kwon #include "zynqmp_dp.h" 27d76271d2SHyun Kwon #include "zynqmp_dpsub.h" 2876c8eeb7SLaurent Pinchart #include "zynqmp_kms.h" 29d76271d2SHyun Kwon 30d76271d2SHyun Kwon /* ----------------------------------------------------------------------------- 31d76271d2SHyun Kwon * Power Management 32d76271d2SHyun Kwon */ 33d76271d2SHyun Kwon 34d76271d2SHyun Kwon static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev) 35d76271d2SHyun Kwon { 36d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 37d76271d2SHyun Kwon 38d189835fSLaurent Pinchart if (!dpsub->drm) 39d189835fSLaurent Pinchart return 0; 40d189835fSLaurent Pinchart 41d189835fSLaurent Pinchart return drm_mode_config_helper_suspend(&dpsub->drm->dev); 42d76271d2SHyun Kwon } 43d76271d2SHyun Kwon 44d76271d2SHyun Kwon static int __maybe_unused zynqmp_dpsub_resume(struct device *dev) 45d76271d2SHyun Kwon { 46d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 47d76271d2SHyun Kwon 48d189835fSLaurent Pinchart if (!dpsub->drm) 49d189835fSLaurent Pinchart return 0; 50d189835fSLaurent Pinchart 51d189835fSLaurent Pinchart return drm_mode_config_helper_resume(&dpsub->drm->dev); 52d76271d2SHyun Kwon } 53d76271d2SHyun Kwon 54d76271d2SHyun Kwon static const struct dev_pm_ops zynqmp_dpsub_pm_ops = { 55d76271d2SHyun Kwon SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume) 56d76271d2SHyun Kwon }; 57d76271d2SHyun Kwon 58d76271d2SHyun Kwon /* ----------------------------------------------------------------------------- 59c979296eSLaurent Pinchart * DPSUB Configuration 60c979296eSLaurent Pinchart */ 61c979296eSLaurent Pinchart 62c979296eSLaurent Pinchart /** 63c979296eSLaurent Pinchart * zynqmp_dpsub_audio_enabled - If the audio is enabled 64c979296eSLaurent Pinchart * @dpsub: DisplayPort subsystem 65c979296eSLaurent Pinchart * 66c979296eSLaurent Pinchart * Return if the audio is enabled depending on the audio clock. 67c979296eSLaurent Pinchart * 68c979296eSLaurent Pinchart * Return: true if audio is enabled, or false. 69c979296eSLaurent Pinchart */ 70c979296eSLaurent Pinchart bool zynqmp_dpsub_audio_enabled(struct zynqmp_dpsub *dpsub) 71c979296eSLaurent Pinchart { 72c979296eSLaurent Pinchart return !!dpsub->aud_clk; 73c979296eSLaurent Pinchart } 74c979296eSLaurent Pinchart 75c979296eSLaurent Pinchart /** 76c979296eSLaurent Pinchart * zynqmp_dpsub_get_audio_clk_rate - Get the current audio clock rate 77c979296eSLaurent Pinchart * @dpsub: DisplayPort subsystem 78c979296eSLaurent Pinchart * 79c979296eSLaurent Pinchart * Return: the current audio clock rate. 80c979296eSLaurent Pinchart */ 81c979296eSLaurent Pinchart unsigned int zynqmp_dpsub_get_audio_clk_rate(struct zynqmp_dpsub *dpsub) 82c979296eSLaurent Pinchart { 83c979296eSLaurent Pinchart if (zynqmp_dpsub_audio_enabled(dpsub)) 84c979296eSLaurent Pinchart return 0; 85c979296eSLaurent Pinchart return clk_get_rate(dpsub->aud_clk); 86c979296eSLaurent Pinchart } 87c979296eSLaurent Pinchart 88c979296eSLaurent Pinchart /* ----------------------------------------------------------------------------- 89d76271d2SHyun Kwon * Probe & Remove 90d76271d2SHyun Kwon */ 91d76271d2SHyun Kwon 92d76271d2SHyun Kwon static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub) 93d76271d2SHyun Kwon { 94d76271d2SHyun Kwon int ret; 95d76271d2SHyun Kwon 96d76271d2SHyun Kwon dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk"); 97d76271d2SHyun Kwon if (IS_ERR(dpsub->apb_clk)) 98d76271d2SHyun Kwon return PTR_ERR(dpsub->apb_clk); 99d76271d2SHyun Kwon 100d76271d2SHyun Kwon ret = clk_prepare_enable(dpsub->apb_clk); 101d76271d2SHyun Kwon if (ret) { 102d76271d2SHyun Kwon dev_err(dpsub->dev, "failed to enable the APB clock\n"); 103d76271d2SHyun Kwon return ret; 104d76271d2SHyun Kwon } 105d76271d2SHyun Kwon 106c979296eSLaurent Pinchart /* 107c979296eSLaurent Pinchart * Try the live PL video clock, and fall back to the PS clock if the 108c979296eSLaurent Pinchart * live PL video clock isn't valid. 109c979296eSLaurent Pinchart */ 1101682ade6SLaurent Pinchart dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_live_video_in_clk"); 1111682ade6SLaurent Pinchart if (!IS_ERR(dpsub->vid_clk)) 1121682ade6SLaurent Pinchart dpsub->vid_clk_from_ps = false; 1131682ade6SLaurent Pinchart else if (PTR_ERR(dpsub->vid_clk) == -EPROBE_DEFER) 1141682ade6SLaurent Pinchart return PTR_ERR(dpsub->vid_clk); 1151682ade6SLaurent Pinchart 1161682ade6SLaurent Pinchart if (IS_ERR_OR_NULL(dpsub->vid_clk)) { 1171682ade6SLaurent Pinchart dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_vtc_pixel_clk_in"); 1181682ade6SLaurent Pinchart if (IS_ERR(dpsub->vid_clk)) { 1191682ade6SLaurent Pinchart dev_err(dpsub->dev, "failed to init any video clock\n"); 1201682ade6SLaurent Pinchart return PTR_ERR(dpsub->vid_clk); 1211682ade6SLaurent Pinchart } 1221682ade6SLaurent Pinchart dpsub->vid_clk_from_ps = true; 1231682ade6SLaurent Pinchart } 1241682ade6SLaurent Pinchart 125c979296eSLaurent Pinchart /* 126c979296eSLaurent Pinchart * Try the live PL audio clock, and fall back to the PS clock if the 127c979296eSLaurent Pinchart * live PL audio clock isn't valid. Missing audio clock disables audio 128c979296eSLaurent Pinchart * but isn't an error. 129c979296eSLaurent Pinchart */ 130c979296eSLaurent Pinchart dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_live_audio_aclk"); 131c979296eSLaurent Pinchart if (!IS_ERR(dpsub->aud_clk)) { 132c979296eSLaurent Pinchart dpsub->aud_clk_from_ps = false; 133c979296eSLaurent Pinchart return 0; 134c979296eSLaurent Pinchart } 135c979296eSLaurent Pinchart 136c979296eSLaurent Pinchart dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_aud_clk"); 137c979296eSLaurent Pinchart if (!IS_ERR(dpsub->aud_clk)) { 138c979296eSLaurent Pinchart dpsub->aud_clk_from_ps = true; 139c979296eSLaurent Pinchart return 0; 140c979296eSLaurent Pinchart } 141c979296eSLaurent Pinchart 142c979296eSLaurent Pinchart dev_info(dpsub->dev, "audio disabled due to missing clock\n"); 143d76271d2SHyun Kwon return 0; 144d76271d2SHyun Kwon } 145d76271d2SHyun Kwon 14652c2cf14SLaurent Pinchart static int zynqmp_dpsub_parse_dt(struct zynqmp_dpsub *dpsub) 14752c2cf14SLaurent Pinchart { 14852c2cf14SLaurent Pinchart struct device_node *np; 14952c2cf14SLaurent Pinchart unsigned int i; 15052c2cf14SLaurent Pinchart 15152c2cf14SLaurent Pinchart /* 15252c2cf14SLaurent Pinchart * For backward compatibility with old device trees that don't contain 15352c2cf14SLaurent Pinchart * ports, consider that only the DP output port is connected if no 15452c2cf14SLaurent Pinchart * ports child no exists. 15552c2cf14SLaurent Pinchart */ 15652c2cf14SLaurent Pinchart np = of_get_child_by_name(dpsub->dev->of_node, "ports"); 15752c2cf14SLaurent Pinchart of_node_put(np); 15852c2cf14SLaurent Pinchart if (!np) { 15952c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "missing ports, update DT bindings\n"); 16052c2cf14SLaurent Pinchart dpsub->connected_ports = BIT(ZYNQMP_DPSUB_PORT_OUT_DP); 161*51ae3bd4SLaurent Pinchart dpsub->dma_enabled = true; 16252c2cf14SLaurent Pinchart return 0; 16352c2cf14SLaurent Pinchart } 16452c2cf14SLaurent Pinchart 16552c2cf14SLaurent Pinchart /* Check which ports are connected. */ 16652c2cf14SLaurent Pinchart for (i = 0; i < ZYNQMP_DPSUB_NUM_PORTS; ++i) { 16752c2cf14SLaurent Pinchart struct device_node *np; 16852c2cf14SLaurent Pinchart 16952c2cf14SLaurent Pinchart np = of_graph_get_remote_node(dpsub->dev->of_node, i, -1); 17052c2cf14SLaurent Pinchart if (np) { 17152c2cf14SLaurent Pinchart dpsub->connected_ports |= BIT(i); 17252c2cf14SLaurent Pinchart of_node_put(np); 17352c2cf14SLaurent Pinchart } 17452c2cf14SLaurent Pinchart } 17552c2cf14SLaurent Pinchart 17652c2cf14SLaurent Pinchart /* Sanity checks. */ 17752c2cf14SLaurent Pinchart if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) || 17852c2cf14SLaurent Pinchart (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) 17952c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "live video unsupported, ignoring\n"); 18052c2cf14SLaurent Pinchart 181*51ae3bd4SLaurent Pinchart dpsub->dma_enabled = true; 182*51ae3bd4SLaurent Pinchart 18352c2cf14SLaurent Pinchart if (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_AUDIO)) 18452c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "live audio unsupported, ignoring\n"); 18552c2cf14SLaurent Pinchart 18652c2cf14SLaurent Pinchart if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_VIDEO)) || 18752c2cf14SLaurent Pinchart (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_AUDIO))) 18852c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "output to PL unsupported, ignoring\n"); 18952c2cf14SLaurent Pinchart 19052c2cf14SLaurent Pinchart if (!(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_DP))) { 19152c2cf14SLaurent Pinchart dev_err(dpsub->dev, "DP output port not connected\n"); 19252c2cf14SLaurent Pinchart return -EINVAL; 19352c2cf14SLaurent Pinchart } 19452c2cf14SLaurent Pinchart 19552c2cf14SLaurent Pinchart return 0; 19652c2cf14SLaurent Pinchart } 19752c2cf14SLaurent Pinchart 198d189835fSLaurent Pinchart void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub) 1996ca91bb4SLaurent Pinchart { 2006ca91bb4SLaurent Pinchart kfree(dpsub->disp); 2016ca91bb4SLaurent Pinchart kfree(dpsub->dp); 202d189835fSLaurent Pinchart kfree(dpsub); 2036ca91bb4SLaurent Pinchart } 2046ca91bb4SLaurent Pinchart 205d76271d2SHyun Kwon static int zynqmp_dpsub_probe(struct platform_device *pdev) 206d76271d2SHyun Kwon { 207d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub; 208d76271d2SHyun Kwon int ret; 209d76271d2SHyun Kwon 210d76271d2SHyun Kwon /* Allocate private data. */ 211d189835fSLaurent Pinchart dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL); 212d189835fSLaurent Pinchart if (!dpsub) 213d189835fSLaurent Pinchart return -ENOMEM; 2146ca91bb4SLaurent Pinchart 215d76271d2SHyun Kwon dpsub->dev = &pdev->dev; 216d76271d2SHyun Kwon platform_set_drvdata(pdev, dpsub); 217d76271d2SHyun Kwon 218d76271d2SHyun Kwon dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT)); 219d76271d2SHyun Kwon 220d76271d2SHyun Kwon /* Try the reserved memory. Proceed if there's none. */ 221d76271d2SHyun Kwon of_reserved_mem_device_init(&pdev->dev); 222d76271d2SHyun Kwon 223d76271d2SHyun Kwon ret = zynqmp_dpsub_init_clocks(dpsub); 224d76271d2SHyun Kwon if (ret < 0) 225d76271d2SHyun Kwon goto err_mem; 226d76271d2SHyun Kwon 22752c2cf14SLaurent Pinchart ret = zynqmp_dpsub_parse_dt(dpsub); 22852c2cf14SLaurent Pinchart if (ret < 0) 22952c2cf14SLaurent Pinchart goto err_mem; 23052c2cf14SLaurent Pinchart 231d76271d2SHyun Kwon pm_runtime_enable(&pdev->dev); 232d76271d2SHyun Kwon 233d76271d2SHyun Kwon /* 234d76271d2SHyun Kwon * DP should be probed first so that the zynqmp_disp can set the output 235d76271d2SHyun Kwon * format accordingly. 236d76271d2SHyun Kwon */ 2376ca91bb4SLaurent Pinchart ret = zynqmp_dp_probe(dpsub); 238d76271d2SHyun Kwon if (ret) 239d76271d2SHyun Kwon goto err_pm; 240d76271d2SHyun Kwon 2416ca91bb4SLaurent Pinchart ret = zynqmp_disp_probe(dpsub); 242d76271d2SHyun Kwon if (ret) 243d76271d2SHyun Kwon goto err_dp; 244d76271d2SHyun Kwon 245d76271d2SHyun Kwon ret = zynqmp_dpsub_drm_init(dpsub); 246d76271d2SHyun Kwon if (ret) 247d76271d2SHyun Kwon goto err_disp; 248d76271d2SHyun Kwon 249d76271d2SHyun Kwon dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed"); 250d76271d2SHyun Kwon 251d76271d2SHyun Kwon return 0; 252d76271d2SHyun Kwon 253d76271d2SHyun Kwon err_disp: 254d76271d2SHyun Kwon zynqmp_disp_remove(dpsub); 255d76271d2SHyun Kwon err_dp: 256d76271d2SHyun Kwon zynqmp_dp_remove(dpsub); 257d76271d2SHyun Kwon err_pm: 258d76271d2SHyun Kwon pm_runtime_disable(&pdev->dev); 259d76271d2SHyun Kwon clk_disable_unprepare(dpsub->apb_clk); 260d76271d2SHyun Kwon err_mem: 261d76271d2SHyun Kwon of_reserved_mem_device_release(&pdev->dev); 262d189835fSLaurent Pinchart if (!dpsub->drm) 263d189835fSLaurent Pinchart zynqmp_dpsub_release(dpsub); 264d76271d2SHyun Kwon return ret; 265d76271d2SHyun Kwon } 266d76271d2SHyun Kwon 267d76271d2SHyun Kwon static int zynqmp_dpsub_remove(struct platform_device *pdev) 268d76271d2SHyun Kwon { 269d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 270d76271d2SHyun Kwon 271d189835fSLaurent Pinchart if (dpsub->drm) 272074ef0ceSLaurent Pinchart zynqmp_dpsub_drm_cleanup(dpsub); 273d76271d2SHyun Kwon 274d76271d2SHyun Kwon zynqmp_disp_remove(dpsub); 275d76271d2SHyun Kwon zynqmp_dp_remove(dpsub); 276d76271d2SHyun Kwon 277d76271d2SHyun Kwon pm_runtime_disable(&pdev->dev); 278d76271d2SHyun Kwon clk_disable_unprepare(dpsub->apb_clk); 279d76271d2SHyun Kwon of_reserved_mem_device_release(&pdev->dev); 280d76271d2SHyun Kwon 281d189835fSLaurent Pinchart if (!dpsub->drm) 282d189835fSLaurent Pinchart zynqmp_dpsub_release(dpsub); 283d189835fSLaurent Pinchart 284d76271d2SHyun Kwon return 0; 285d76271d2SHyun Kwon } 286d76271d2SHyun Kwon 287d76271d2SHyun Kwon static void zynqmp_dpsub_shutdown(struct platform_device *pdev) 288d76271d2SHyun Kwon { 289d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 290d76271d2SHyun Kwon 291d189835fSLaurent Pinchart if (!dpsub->drm) 292d189835fSLaurent Pinchart return; 293d189835fSLaurent Pinchart 294d189835fSLaurent Pinchart drm_atomic_helper_shutdown(&dpsub->drm->dev); 295d76271d2SHyun Kwon } 296d76271d2SHyun Kwon 297d76271d2SHyun Kwon static const struct of_device_id zynqmp_dpsub_of_match[] = { 298d76271d2SHyun Kwon { .compatible = "xlnx,zynqmp-dpsub-1.7", }, 299d76271d2SHyun Kwon { /* end of table */ }, 300d76271d2SHyun Kwon }; 301d76271d2SHyun Kwon MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match); 302d76271d2SHyun Kwon 303d76271d2SHyun Kwon static struct platform_driver zynqmp_dpsub_driver = { 304d76271d2SHyun Kwon .probe = zynqmp_dpsub_probe, 305d76271d2SHyun Kwon .remove = zynqmp_dpsub_remove, 306d76271d2SHyun Kwon .shutdown = zynqmp_dpsub_shutdown, 307d76271d2SHyun Kwon .driver = { 308d76271d2SHyun Kwon .name = "zynqmp-dpsub", 309d76271d2SHyun Kwon .pm = &zynqmp_dpsub_pm_ops, 310d76271d2SHyun Kwon .of_match_table = zynqmp_dpsub_of_match, 311d76271d2SHyun Kwon }, 312d76271d2SHyun Kwon }; 313d76271d2SHyun Kwon 314fad54534SJavier Martinez Canillas drm_module_platform_driver(zynqmp_dpsub_driver); 315d76271d2SHyun Kwon 316d76271d2SHyun Kwon MODULE_AUTHOR("Xilinx, Inc."); 317d76271d2SHyun Kwon MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver"); 318d76271d2SHyun Kwon MODULE_LICENSE("GPL v2"); 319