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> 15*52c2cf14SLaurent 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 146*52c2cf14SLaurent Pinchart static int zynqmp_dpsub_parse_dt(struct zynqmp_dpsub *dpsub) 147*52c2cf14SLaurent Pinchart { 148*52c2cf14SLaurent Pinchart struct device_node *np; 149*52c2cf14SLaurent Pinchart unsigned int i; 150*52c2cf14SLaurent Pinchart 151*52c2cf14SLaurent Pinchart /* 152*52c2cf14SLaurent Pinchart * For backward compatibility with old device trees that don't contain 153*52c2cf14SLaurent Pinchart * ports, consider that only the DP output port is connected if no 154*52c2cf14SLaurent Pinchart * ports child no exists. 155*52c2cf14SLaurent Pinchart */ 156*52c2cf14SLaurent Pinchart np = of_get_child_by_name(dpsub->dev->of_node, "ports"); 157*52c2cf14SLaurent Pinchart of_node_put(np); 158*52c2cf14SLaurent Pinchart if (!np) { 159*52c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "missing ports, update DT bindings\n"); 160*52c2cf14SLaurent Pinchart dpsub->connected_ports = BIT(ZYNQMP_DPSUB_PORT_OUT_DP); 161*52c2cf14SLaurent Pinchart return 0; 162*52c2cf14SLaurent Pinchart } 163*52c2cf14SLaurent Pinchart 164*52c2cf14SLaurent Pinchart /* Check which ports are connected. */ 165*52c2cf14SLaurent Pinchart for (i = 0; i < ZYNQMP_DPSUB_NUM_PORTS; ++i) { 166*52c2cf14SLaurent Pinchart struct device_node *np; 167*52c2cf14SLaurent Pinchart 168*52c2cf14SLaurent Pinchart np = of_graph_get_remote_node(dpsub->dev->of_node, i, -1); 169*52c2cf14SLaurent Pinchart if (np) { 170*52c2cf14SLaurent Pinchart dpsub->connected_ports |= BIT(i); 171*52c2cf14SLaurent Pinchart of_node_put(np); 172*52c2cf14SLaurent Pinchart } 173*52c2cf14SLaurent Pinchart } 174*52c2cf14SLaurent Pinchart 175*52c2cf14SLaurent Pinchart /* Sanity checks. */ 176*52c2cf14SLaurent Pinchart if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) || 177*52c2cf14SLaurent Pinchart (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) 178*52c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "live video unsupported, ignoring\n"); 179*52c2cf14SLaurent Pinchart 180*52c2cf14SLaurent Pinchart if (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_AUDIO)) 181*52c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "live audio unsupported, ignoring\n"); 182*52c2cf14SLaurent Pinchart 183*52c2cf14SLaurent Pinchart if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_VIDEO)) || 184*52c2cf14SLaurent Pinchart (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_AUDIO))) 185*52c2cf14SLaurent Pinchart dev_warn(dpsub->dev, "output to PL unsupported, ignoring\n"); 186*52c2cf14SLaurent Pinchart 187*52c2cf14SLaurent Pinchart if (!(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_DP))) { 188*52c2cf14SLaurent Pinchart dev_err(dpsub->dev, "DP output port not connected\n"); 189*52c2cf14SLaurent Pinchart return -EINVAL; 190*52c2cf14SLaurent Pinchart } 191*52c2cf14SLaurent Pinchart 192*52c2cf14SLaurent Pinchart return 0; 193*52c2cf14SLaurent Pinchart } 194*52c2cf14SLaurent Pinchart 195d189835fSLaurent Pinchart void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub) 1966ca91bb4SLaurent Pinchart { 1976ca91bb4SLaurent Pinchart kfree(dpsub->disp); 1986ca91bb4SLaurent Pinchart kfree(dpsub->dp); 199d189835fSLaurent Pinchart kfree(dpsub); 2006ca91bb4SLaurent Pinchart } 2016ca91bb4SLaurent Pinchart 202d76271d2SHyun Kwon static int zynqmp_dpsub_probe(struct platform_device *pdev) 203d76271d2SHyun Kwon { 204d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub; 205d76271d2SHyun Kwon int ret; 206d76271d2SHyun Kwon 207d76271d2SHyun Kwon /* Allocate private data. */ 208d189835fSLaurent Pinchart dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL); 209d189835fSLaurent Pinchart if (!dpsub) 210d189835fSLaurent Pinchart return -ENOMEM; 2116ca91bb4SLaurent Pinchart 212d76271d2SHyun Kwon dpsub->dev = &pdev->dev; 213d76271d2SHyun Kwon platform_set_drvdata(pdev, dpsub); 214d76271d2SHyun Kwon 215d76271d2SHyun Kwon dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT)); 216d76271d2SHyun Kwon 217d76271d2SHyun Kwon /* Try the reserved memory. Proceed if there's none. */ 218d76271d2SHyun Kwon of_reserved_mem_device_init(&pdev->dev); 219d76271d2SHyun Kwon 220d76271d2SHyun Kwon ret = zynqmp_dpsub_init_clocks(dpsub); 221d76271d2SHyun Kwon if (ret < 0) 222d76271d2SHyun Kwon goto err_mem; 223d76271d2SHyun Kwon 224*52c2cf14SLaurent Pinchart ret = zynqmp_dpsub_parse_dt(dpsub); 225*52c2cf14SLaurent Pinchart if (ret < 0) 226*52c2cf14SLaurent Pinchart goto err_mem; 227*52c2cf14SLaurent Pinchart 228d76271d2SHyun Kwon pm_runtime_enable(&pdev->dev); 229d76271d2SHyun Kwon 230d76271d2SHyun Kwon /* 231d76271d2SHyun Kwon * DP should be probed first so that the zynqmp_disp can set the output 232d76271d2SHyun Kwon * format accordingly. 233d76271d2SHyun Kwon */ 2346ca91bb4SLaurent Pinchart ret = zynqmp_dp_probe(dpsub); 235d76271d2SHyun Kwon if (ret) 236d76271d2SHyun Kwon goto err_pm; 237d76271d2SHyun Kwon 2386ca91bb4SLaurent Pinchart ret = zynqmp_disp_probe(dpsub); 239d76271d2SHyun Kwon if (ret) 240d76271d2SHyun Kwon goto err_dp; 241d76271d2SHyun Kwon 242d76271d2SHyun Kwon ret = zynqmp_dpsub_drm_init(dpsub); 243d76271d2SHyun Kwon if (ret) 244d76271d2SHyun Kwon goto err_disp; 245d76271d2SHyun Kwon 246d76271d2SHyun Kwon dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed"); 247d76271d2SHyun Kwon 248d76271d2SHyun Kwon return 0; 249d76271d2SHyun Kwon 250d76271d2SHyun Kwon err_disp: 251d76271d2SHyun Kwon zynqmp_disp_remove(dpsub); 252d76271d2SHyun Kwon err_dp: 253d76271d2SHyun Kwon zynqmp_dp_remove(dpsub); 254d76271d2SHyun Kwon err_pm: 255d76271d2SHyun Kwon pm_runtime_disable(&pdev->dev); 256d76271d2SHyun Kwon clk_disable_unprepare(dpsub->apb_clk); 257d76271d2SHyun Kwon err_mem: 258d76271d2SHyun Kwon of_reserved_mem_device_release(&pdev->dev); 259d189835fSLaurent Pinchart if (!dpsub->drm) 260d189835fSLaurent Pinchart zynqmp_dpsub_release(dpsub); 261d76271d2SHyun Kwon return ret; 262d76271d2SHyun Kwon } 263d76271d2SHyun Kwon 264d76271d2SHyun Kwon static int zynqmp_dpsub_remove(struct platform_device *pdev) 265d76271d2SHyun Kwon { 266d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 267d76271d2SHyun Kwon 268d189835fSLaurent Pinchart if (dpsub->drm) 269074ef0ceSLaurent Pinchart zynqmp_dpsub_drm_cleanup(dpsub); 270d76271d2SHyun Kwon 271d76271d2SHyun Kwon zynqmp_disp_remove(dpsub); 272d76271d2SHyun Kwon zynqmp_dp_remove(dpsub); 273d76271d2SHyun Kwon 274d76271d2SHyun Kwon pm_runtime_disable(&pdev->dev); 275d76271d2SHyun Kwon clk_disable_unprepare(dpsub->apb_clk); 276d76271d2SHyun Kwon of_reserved_mem_device_release(&pdev->dev); 277d76271d2SHyun Kwon 278d189835fSLaurent Pinchart if (!dpsub->drm) 279d189835fSLaurent Pinchart zynqmp_dpsub_release(dpsub); 280d189835fSLaurent Pinchart 281d76271d2SHyun Kwon return 0; 282d76271d2SHyun Kwon } 283d76271d2SHyun Kwon 284d76271d2SHyun Kwon static void zynqmp_dpsub_shutdown(struct platform_device *pdev) 285d76271d2SHyun Kwon { 286d76271d2SHyun Kwon struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 287d76271d2SHyun Kwon 288d189835fSLaurent Pinchart if (!dpsub->drm) 289d189835fSLaurent Pinchart return; 290d189835fSLaurent Pinchart 291d189835fSLaurent Pinchart drm_atomic_helper_shutdown(&dpsub->drm->dev); 292d76271d2SHyun Kwon } 293d76271d2SHyun Kwon 294d76271d2SHyun Kwon static const struct of_device_id zynqmp_dpsub_of_match[] = { 295d76271d2SHyun Kwon { .compatible = "xlnx,zynqmp-dpsub-1.7", }, 296d76271d2SHyun Kwon { /* end of table */ }, 297d76271d2SHyun Kwon }; 298d76271d2SHyun Kwon MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match); 299d76271d2SHyun Kwon 300d76271d2SHyun Kwon static struct platform_driver zynqmp_dpsub_driver = { 301d76271d2SHyun Kwon .probe = zynqmp_dpsub_probe, 302d76271d2SHyun Kwon .remove = zynqmp_dpsub_remove, 303d76271d2SHyun Kwon .shutdown = zynqmp_dpsub_shutdown, 304d76271d2SHyun Kwon .driver = { 305d76271d2SHyun Kwon .name = "zynqmp-dpsub", 306d76271d2SHyun Kwon .pm = &zynqmp_dpsub_pm_ops, 307d76271d2SHyun Kwon .of_match_table = zynqmp_dpsub_of_match, 308d76271d2SHyun Kwon }, 309d76271d2SHyun Kwon }; 310d76271d2SHyun Kwon 311fad54534SJavier Martinez Canillas drm_module_platform_driver(zynqmp_dpsub_driver); 312d76271d2SHyun Kwon 313d76271d2SHyun Kwon MODULE_AUTHOR("Xilinx, Inc."); 314d76271d2SHyun Kwon MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver"); 315d76271d2SHyun Kwon MODULE_LICENSE("GPL v2"); 316