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> 22*56167161SLaurent Pinchart #include <drm/drm_bridge.h> 23074ef0ceSLaurent Pinchart #include <drm/drm_modeset_helper.h> 24fad54534SJavier Martinez Canillas #include <drm/drm_module.h> 25d76271d2SHyun Kwon 26d76271d2SHyun Kwon #include "zynqmp_disp.h" 27d76271d2SHyun Kwon #include "zynqmp_dp.h" 28d76271d2SHyun Kwon #include "zynqmp_dpsub.h" 2976c8eeb7SLaurent Pinchart #include "zynqmp_kms.h" 30d76271d2SHyun Kwon 31d76271d2SHyun Kwon /* ----------------------------------------------------------------------------- 32d76271d2SHyun Kwon * Power Management 33d76271d2SHyun Kwon */ 34d76271d2SHyun Kwon 35d76271d2SHyun Kwon static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev) 36d76271d2SHyun Kwon { 37d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 38d76271d2SHyun Kwon 39d189835fSLaurent Pinchart if (!dpsub->drm) 40d189835fSLaurent Pinchart return 0; 41d189835fSLaurent Pinchart 42d189835fSLaurent Pinchart return drm_mode_config_helper_suspend(&dpsub->drm->dev); 43d76271d2SHyun Kwon } 44d76271d2SHyun Kwon 45d76271d2SHyun Kwon static int __maybe_unused zynqmp_dpsub_resume(struct device *dev) 46d76271d2SHyun Kwon { 47d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 48d76271d2SHyun Kwon 49d189835fSLaurent Pinchart if (!dpsub->drm) 50d189835fSLaurent Pinchart return 0; 51d189835fSLaurent Pinchart 52d189835fSLaurent Pinchart return drm_mode_config_helper_resume(&dpsub->drm->dev); 53d76271d2SHyun Kwon } 54d76271d2SHyun Kwon 55d76271d2SHyun Kwon static const struct dev_pm_ops zynqmp_dpsub_pm_ops = { 56d76271d2SHyun Kwon SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume) 57d76271d2SHyun Kwon }; 58d76271d2SHyun Kwon 59d76271d2SHyun Kwon /* ----------------------------------------------------------------------------- 60c979296eSLaurent Pinchart * DPSUB Configuration 61c979296eSLaurent Pinchart */ 62c979296eSLaurent Pinchart 63c979296eSLaurent Pinchart /** 64c979296eSLaurent Pinchart * zynqmp_dpsub_audio_enabled - If the audio is enabled 65c979296eSLaurent Pinchart * @dpsub: DisplayPort subsystem 66c979296eSLaurent Pinchart * 67c979296eSLaurent Pinchart * Return if the audio is enabled depending on the audio clock. 68c979296eSLaurent Pinchart * 69c979296eSLaurent Pinchart * Return: true if audio is enabled, or false. 70c979296eSLaurent Pinchart */ 71c979296eSLaurent Pinchart bool zynqmp_dpsub_audio_enabled(struct zynqmp_dpsub *dpsub) 72c979296eSLaurent Pinchart { 73c979296eSLaurent Pinchart return !!dpsub->aud_clk; 74c979296eSLaurent Pinchart } 75c979296eSLaurent Pinchart 76c979296eSLaurent Pinchart /** 77c979296eSLaurent Pinchart * zynqmp_dpsub_get_audio_clk_rate - Get the current audio clock rate 78c979296eSLaurent Pinchart * @dpsub: DisplayPort subsystem 79c979296eSLaurent Pinchart * 80c979296eSLaurent Pinchart * Return: the current audio clock rate. 81c979296eSLaurent Pinchart */ 82c979296eSLaurent Pinchart unsigned int zynqmp_dpsub_get_audio_clk_rate(struct zynqmp_dpsub *dpsub) 83c979296eSLaurent Pinchart { 84c979296eSLaurent Pinchart if (zynqmp_dpsub_audio_enabled(dpsub)) 85c979296eSLaurent Pinchart return 0; 86c979296eSLaurent Pinchart return clk_get_rate(dpsub->aud_clk); 87c979296eSLaurent Pinchart } 88c979296eSLaurent Pinchart 89c979296eSLaurent Pinchart /* ----------------------------------------------------------------------------- 90d76271d2SHyun Kwon * Probe & Remove 91d76271d2SHyun Kwon */ 92d76271d2SHyun Kwon 93d76271d2SHyun Kwon static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub) 94d76271d2SHyun Kwon { 95d76271d2SHyun Kwon int ret; 96d76271d2SHyun Kwon 97d76271d2SHyun Kwon dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk"); 98d76271d2SHyun Kwon if (IS_ERR(dpsub->apb_clk)) 99d76271d2SHyun Kwon return PTR_ERR(dpsub->apb_clk); 100d76271d2SHyun Kwon 101d76271d2SHyun Kwon ret = clk_prepare_enable(dpsub->apb_clk); 102d76271d2SHyun Kwon if (ret) { 103d76271d2SHyun Kwon dev_err(dpsub->dev, "failed to enable the APB clock\n"); 104d76271d2SHyun Kwon return ret; 105d76271d2SHyun Kwon } 106d76271d2SHyun Kwon 107c979296eSLaurent Pinchart /* 108c979296eSLaurent Pinchart * Try the live PL video clock, and fall back to the PS clock if the 109c979296eSLaurent Pinchart * live PL video clock isn't valid. 110c979296eSLaurent Pinchart */ 1111682ade6SLaurent Pinchart dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_live_video_in_clk"); 1121682ade6SLaurent Pinchart if (!IS_ERR(dpsub->vid_clk)) 1131682ade6SLaurent Pinchart dpsub->vid_clk_from_ps = false; 1141682ade6SLaurent Pinchart else if (PTR_ERR(dpsub->vid_clk) == -EPROBE_DEFER) 1151682ade6SLaurent Pinchart return PTR_ERR(dpsub->vid_clk); 1161682ade6SLaurent Pinchart 1171682ade6SLaurent Pinchart if (IS_ERR_OR_NULL(dpsub->vid_clk)) { 1181682ade6SLaurent Pinchart dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_vtc_pixel_clk_in"); 1191682ade6SLaurent Pinchart if (IS_ERR(dpsub->vid_clk)) { 1201682ade6SLaurent Pinchart dev_err(dpsub->dev, "failed to init any video clock\n"); 1211682ade6SLaurent Pinchart return PTR_ERR(dpsub->vid_clk); 1221682ade6SLaurent Pinchart } 1231682ade6SLaurent Pinchart dpsub->vid_clk_from_ps = true; 1241682ade6SLaurent Pinchart } 1251682ade6SLaurent Pinchart 126c979296eSLaurent Pinchart /* 127c979296eSLaurent Pinchart * Try the live PL audio clock, and fall back to the PS clock if the 128c979296eSLaurent Pinchart * live PL audio clock isn't valid. Missing audio clock disables audio 129c979296eSLaurent Pinchart * but isn't an error. 130c979296eSLaurent Pinchart */ 131c979296eSLaurent Pinchart dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_live_audio_aclk"); 132c979296eSLaurent Pinchart if (!IS_ERR(dpsub->aud_clk)) { 133c979296eSLaurent Pinchart dpsub->aud_clk_from_ps = false; 134c979296eSLaurent Pinchart return 0; 135c979296eSLaurent Pinchart } 136c979296eSLaurent Pinchart 137c979296eSLaurent Pinchart dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_aud_clk"); 138c979296eSLaurent Pinchart if (!IS_ERR(dpsub->aud_clk)) { 139c979296eSLaurent Pinchart dpsub->aud_clk_from_ps = true; 140c979296eSLaurent Pinchart return 0; 141c979296eSLaurent Pinchart } 142c979296eSLaurent Pinchart 143c979296eSLaurent Pinchart dev_info(dpsub->dev, "audio disabled due to missing clock\n"); 144d76271d2SHyun Kwon return 0; 145d76271d2SHyun Kwon } 146d76271d2SHyun Kwon 14752c2cf14SLaurent Pinchart static int zynqmp_dpsub_parse_dt(struct zynqmp_dpsub *dpsub) 14852c2cf14SLaurent Pinchart { 14952c2cf14SLaurent Pinchart struct device_node *np; 15052c2cf14SLaurent Pinchart unsigned int i; 15152c2cf14SLaurent Pinchart 15252c2cf14SLaurent Pinchart /* 15352c2cf14SLaurent Pinchart * For backward compatibility with old device trees that don't contain 15452c2cf14SLaurent Pinchart * ports, consider that only the DP output port is connected if no 15552c2cf14SLaurent Pinchart * ports child no exists. 15652c2cf14SLaurent Pinchart */ 15752c2cf14SLaurent Pinchart np = of_get_child_by_name(dpsub->dev->of_node, "ports"); 15852c2cf14SLaurent Pinchart of_node_put(np); 15952c2cf14SLaurent Pinchart if (!np) { 16052c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "missing ports, update DT bindings\n"); 16152c2cf14SLaurent Pinchart dpsub->connected_ports = BIT(ZYNQMP_DPSUB_PORT_OUT_DP); 16251ae3bd4SLaurent Pinchart dpsub->dma_enabled = true; 16352c2cf14SLaurent Pinchart return 0; 16452c2cf14SLaurent Pinchart } 16552c2cf14SLaurent Pinchart 16652c2cf14SLaurent Pinchart /* Check which ports are connected. */ 16752c2cf14SLaurent Pinchart for (i = 0; i < ZYNQMP_DPSUB_NUM_PORTS; ++i) { 16852c2cf14SLaurent Pinchart struct device_node *np; 16952c2cf14SLaurent Pinchart 17052c2cf14SLaurent Pinchart np = of_graph_get_remote_node(dpsub->dev->of_node, i, -1); 17152c2cf14SLaurent Pinchart if (np) { 17252c2cf14SLaurent Pinchart dpsub->connected_ports |= BIT(i); 17352c2cf14SLaurent Pinchart of_node_put(np); 17452c2cf14SLaurent Pinchart } 17552c2cf14SLaurent Pinchart } 17652c2cf14SLaurent Pinchart 17752c2cf14SLaurent Pinchart /* Sanity checks. */ 178*56167161SLaurent Pinchart if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) && 179*56167161SLaurent Pinchart (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) { 180*56167161SLaurent Pinchart dev_err(dpsub->dev, "only one live video input is supported\n"); 181*56167161SLaurent Pinchart return -EINVAL; 182*56167161SLaurent Pinchart } 18352c2cf14SLaurent Pinchart 184*56167161SLaurent Pinchart if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) || 185*56167161SLaurent Pinchart (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) { 186*56167161SLaurent Pinchart if (dpsub->vid_clk_from_ps) { 187*56167161SLaurent Pinchart dev_err(dpsub->dev, 188*56167161SLaurent Pinchart "live video input requires PL clock\n"); 189*56167161SLaurent Pinchart return -EINVAL; 190*56167161SLaurent Pinchart } 191*56167161SLaurent Pinchart } else { 19251ae3bd4SLaurent Pinchart dpsub->dma_enabled = true; 193*56167161SLaurent Pinchart } 19451ae3bd4SLaurent Pinchart 19552c2cf14SLaurent Pinchart if (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_AUDIO)) 19652c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "live audio unsupported, ignoring\n"); 19752c2cf14SLaurent Pinchart 19852c2cf14SLaurent Pinchart if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_VIDEO)) || 19952c2cf14SLaurent Pinchart (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_AUDIO))) 20052c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "output to PL unsupported, ignoring\n"); 20152c2cf14SLaurent Pinchart 20252c2cf14SLaurent Pinchart if (!(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_DP))) { 20352c2cf14SLaurent Pinchart dev_err(dpsub->dev, "DP output port not connected\n"); 20452c2cf14SLaurent Pinchart return -EINVAL; 20552c2cf14SLaurent Pinchart } 20652c2cf14SLaurent Pinchart 20752c2cf14SLaurent Pinchart return 0; 20852c2cf14SLaurent Pinchart } 20952c2cf14SLaurent Pinchart 210d189835fSLaurent Pinchart void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub) 2116ca91bb4SLaurent Pinchart { 2126ca91bb4SLaurent Pinchart kfree(dpsub->disp); 2136ca91bb4SLaurent Pinchart kfree(dpsub->dp); 214d189835fSLaurent Pinchart kfree(dpsub); 2156ca91bb4SLaurent Pinchart } 2166ca91bb4SLaurent Pinchart 217d76271d2SHyun Kwon static int zynqmp_dpsub_probe(struct platform_device *pdev) 218d76271d2SHyun Kwon { 219d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub; 220d76271d2SHyun Kwon int ret; 221d76271d2SHyun Kwon 222d76271d2SHyun Kwon /* Allocate private data. */ 223d189835fSLaurent Pinchart dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL); 224d189835fSLaurent Pinchart if (!dpsub) 225d189835fSLaurent Pinchart return -ENOMEM; 2266ca91bb4SLaurent Pinchart 227d76271d2SHyun Kwon dpsub->dev = &pdev->dev; 228d76271d2SHyun Kwon platform_set_drvdata(pdev, dpsub); 229d76271d2SHyun Kwon 230d76271d2SHyun Kwon dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT)); 231d76271d2SHyun Kwon 232d76271d2SHyun Kwon /* Try the reserved memory. Proceed if there's none. */ 233d76271d2SHyun Kwon of_reserved_mem_device_init(&pdev->dev); 234d76271d2SHyun Kwon 235d76271d2SHyun Kwon ret = zynqmp_dpsub_init_clocks(dpsub); 236d76271d2SHyun Kwon if (ret < 0) 237d76271d2SHyun Kwon goto err_mem; 238d76271d2SHyun Kwon 23952c2cf14SLaurent Pinchart ret = zynqmp_dpsub_parse_dt(dpsub); 24052c2cf14SLaurent Pinchart if (ret < 0) 24152c2cf14SLaurent Pinchart goto err_mem; 24252c2cf14SLaurent Pinchart 243d76271d2SHyun Kwon pm_runtime_enable(&pdev->dev); 244d76271d2SHyun Kwon 245d76271d2SHyun Kwon /* 246d76271d2SHyun Kwon * DP should be probed first so that the zynqmp_disp can set the output 247d76271d2SHyun Kwon * format accordingly. 248d76271d2SHyun Kwon */ 2496ca91bb4SLaurent Pinchart ret = zynqmp_dp_probe(dpsub); 250d76271d2SHyun Kwon if (ret) 251d76271d2SHyun Kwon goto err_pm; 252d76271d2SHyun Kwon 2536ca91bb4SLaurent Pinchart ret = zynqmp_disp_probe(dpsub); 254d76271d2SHyun Kwon if (ret) 255d76271d2SHyun Kwon goto err_dp; 256d76271d2SHyun Kwon 257*56167161SLaurent Pinchart if (dpsub->dma_enabled) { 258d76271d2SHyun Kwon ret = zynqmp_dpsub_drm_init(dpsub); 259d76271d2SHyun Kwon if (ret) 260d76271d2SHyun Kwon goto err_disp; 261*56167161SLaurent Pinchart } else { 262*56167161SLaurent Pinchart drm_bridge_add(dpsub->bridge); 263*56167161SLaurent Pinchart } 264d76271d2SHyun Kwon 265d76271d2SHyun Kwon dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed"); 266d76271d2SHyun Kwon 267d76271d2SHyun Kwon return 0; 268d76271d2SHyun Kwon 269d76271d2SHyun Kwon err_disp: 270d76271d2SHyun Kwon zynqmp_disp_remove(dpsub); 271d76271d2SHyun Kwon err_dp: 272d76271d2SHyun Kwon zynqmp_dp_remove(dpsub); 273d76271d2SHyun Kwon err_pm: 274d76271d2SHyun Kwon pm_runtime_disable(&pdev->dev); 275d76271d2SHyun Kwon clk_disable_unprepare(dpsub->apb_clk); 276d76271d2SHyun Kwon err_mem: 277d76271d2SHyun Kwon of_reserved_mem_device_release(&pdev->dev); 278d189835fSLaurent Pinchart if (!dpsub->drm) 279d189835fSLaurent Pinchart zynqmp_dpsub_release(dpsub); 280d76271d2SHyun Kwon return ret; 281d76271d2SHyun Kwon } 282d76271d2SHyun Kwon 283d76271d2SHyun Kwon static int zynqmp_dpsub_remove(struct platform_device *pdev) 284d76271d2SHyun Kwon { 285d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 286d76271d2SHyun Kwon 287d189835fSLaurent Pinchart if (dpsub->drm) 288074ef0ceSLaurent Pinchart zynqmp_dpsub_drm_cleanup(dpsub); 289*56167161SLaurent Pinchart else 290*56167161SLaurent Pinchart drm_bridge_remove(dpsub->bridge); 291d76271d2SHyun Kwon 292d76271d2SHyun Kwon zynqmp_disp_remove(dpsub); 293d76271d2SHyun Kwon zynqmp_dp_remove(dpsub); 294d76271d2SHyun Kwon 295d76271d2SHyun Kwon pm_runtime_disable(&pdev->dev); 296d76271d2SHyun Kwon clk_disable_unprepare(dpsub->apb_clk); 297d76271d2SHyun Kwon of_reserved_mem_device_release(&pdev->dev); 298d76271d2SHyun Kwon 299d189835fSLaurent Pinchart if (!dpsub->drm) 300d189835fSLaurent Pinchart zynqmp_dpsub_release(dpsub); 301d189835fSLaurent Pinchart 302d76271d2SHyun Kwon return 0; 303d76271d2SHyun Kwon } 304d76271d2SHyun Kwon 305d76271d2SHyun Kwon static void zynqmp_dpsub_shutdown(struct platform_device *pdev) 306d76271d2SHyun Kwon { 307d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 308d76271d2SHyun Kwon 309d189835fSLaurent Pinchart if (!dpsub->drm) 310d189835fSLaurent Pinchart return; 311d189835fSLaurent Pinchart 312d189835fSLaurent Pinchart drm_atomic_helper_shutdown(&dpsub->drm->dev); 313d76271d2SHyun Kwon } 314d76271d2SHyun Kwon 315d76271d2SHyun Kwon static const struct of_device_id zynqmp_dpsub_of_match[] = { 316d76271d2SHyun Kwon { .compatible = "xlnx,zynqmp-dpsub-1.7", }, 317d76271d2SHyun Kwon { /* end of table */ }, 318d76271d2SHyun Kwon }; 319d76271d2SHyun Kwon MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match); 320d76271d2SHyun Kwon 321d76271d2SHyun Kwon static struct platform_driver zynqmp_dpsub_driver = { 322d76271d2SHyun Kwon .probe = zynqmp_dpsub_probe, 323d76271d2SHyun Kwon .remove = zynqmp_dpsub_remove, 324d76271d2SHyun Kwon .shutdown = zynqmp_dpsub_shutdown, 325d76271d2SHyun Kwon .driver = { 326d76271d2SHyun Kwon .name = "zynqmp-dpsub", 327d76271d2SHyun Kwon .pm = &zynqmp_dpsub_pm_ops, 328d76271d2SHyun Kwon .of_match_table = zynqmp_dpsub_of_match, 329d76271d2SHyun Kwon }, 330d76271d2SHyun Kwon }; 331d76271d2SHyun Kwon 332fad54534SJavier Martinez Canillas drm_module_platform_driver(zynqmp_dpsub_driver); 333d76271d2SHyun Kwon 334d76271d2SHyun Kwon MODULE_AUTHOR("Xilinx, Inc."); 335d76271d2SHyun Kwon MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver"); 336d76271d2SHyun Kwon MODULE_LICENSE("GPL v2"); 337