drivers/gpu/drm/xlnx/zynqmp_dpsub.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ZynqMP DisplayPort Subsystem Driver
   4  *
   5  * Copyright (C) 2017 - 2020 Xilinx, Inc.
   6  *
   7  * Authors:
   8  * - Hyun Woo Kwon <[email protected]>
   9  * - Laurent Pinchart <[email protected]>
  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 Management
  33  */
  34
  35 static 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
  45 static 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
  55 static 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  * Probe & Remove
  61  */
  62
  63 static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
  64 {
  65         int ret;
  66
  67         dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
  68         if (IS_ERR(dpsub->apb_clk))
  69                 return PTR_ERR(dpsub->apb_clk);
  70
  71         ret = clk_prepare_enable(dpsub->apb_clk);
  72         if (ret) {
  73                 dev_err(dpsub->dev, "failed to enable the APB clock\n");
  74                 return ret;
  75         }
  76
  77         /*
  78          * Try the live PL video clock, and fall back to the PS clock if the
  79          * live PL video clock isn't valid.
  80          */
  81         dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_live_video_in_clk");
  82         if (!IS_ERR(dpsub->vid_clk))
  83                 dpsub->vid_clk_from_ps = false;
  84         else if (PTR_ERR(dpsub->vid_clk) == -EPROBE_DEFER)
  85                 return PTR_ERR(dpsub->vid_clk);
  86
  87         if (IS_ERR_OR_NULL(dpsub->vid_clk)) {
  88                 dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_vtc_pixel_clk_in");
  89                 if (IS_ERR(dpsub->vid_clk)) {
  90                         dev_err(dpsub->dev, "failed to init any video clock\n");
  91                         return PTR_ERR(dpsub->vid_clk);
  92                 }
  93                 dpsub->vid_clk_from_ps = true;
  94         }
  95
  96         /*
  97          * Try the live PL audio clock, and fall back to the PS clock if the
  98          * live PL audio clock isn't valid. Missing audio clock disables audio
  99          * but isn't an error.
 100          */
 101         dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_live_audio_aclk");
 102         if (!IS_ERR(dpsub->aud_clk)) {
 103                 dpsub->aud_clk_from_ps = false;
 104                 return 0;
 105         }
 106
 107         dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_aud_clk");
 108         if (!IS_ERR(dpsub->aud_clk)) {
 109                 dpsub->aud_clk_from_ps = true;
 110                 return 0;
 111         }
 112
 113         dev_info(dpsub->dev, "audio disabled due to missing clock\n");
 114         return 0;
 115 }
 116
 117 static int zynqmp_dpsub_parse_dt(struct zynqmp_dpsub *dpsub)
 118 {
 119         struct device_node *np;
 120         unsigned int i;
 121
 122         /*
 123          * For backward compatibility with old device trees that don't contain
 124          * ports, consider that only the DP output port is connected if no
 125          * ports child no exists.
 126          */
 127         np = of_get_child_by_name(dpsub->dev->of_node, "ports");
 128         of_node_put(np);
 129         if (!np) {
 130                 dev_warn(dpsub->dev, "missing ports, update DT bindings\n");
 131                 dpsub->connected_ports = BIT(ZYNQMP_DPSUB_PORT_OUT_DP);
 132                 dpsub->dma_enabled = true;
 133                 return 0;
 134         }
 135
 136         /* Check which ports are connected. */
 137         for (i = 0; i < ZYNQMP_DPSUB_NUM_PORTS; ++i) {
 138                 struct device_node *np;
 139
 140                 np = of_graph_get_remote_node(dpsub->dev->of_node, i, -1);
 141                 if (np) {
 142                         dpsub->connected_ports |= BIT(i);
 143                         of_node_put(np);
 144                 }
 145         }
 146
 147         /* Sanity checks. */
 148         if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) &&
 149             (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {
 150                 dev_err(dpsub->dev, "only one live video input is supported\n");
 151                 return -EINVAL;
 152         }
 153
 154         if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) ||
 155             (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {
 156                 if (dpsub->vid_clk_from_ps) {
 157                         dev_err(dpsub->dev,
 158                                 "live video input requires PL clock\n");
 159                         return -EINVAL;
 160                 }
 161         } else {
 162                 dpsub->dma_enabled = true;
 163         }
 164
 165         if (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_AUDIO))
 166                 dev_warn(dpsub->dev, "live audio unsupported, ignoring\n");
 167
 168         if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_VIDEO)) ||
 169             (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_AUDIO)))
 170                 dev_warn(dpsub->dev, "output to PL unsupported, ignoring\n");
 171
 172         if (!(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_DP))) {
 173                 dev_err(dpsub->dev, "DP output port not connected\n");
 174                 return -EINVAL;
 175         }
 176
 177         return 0;
 178 }
 179
 180 void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub)
 181 {
 182         kfree(dpsub->disp);
 183         kfree(dpsub->dp);
 184         kfree(dpsub);
 185 }
 186
 187 static int zynqmp_dpsub_probe(struct platform_device *pdev)
 188 {
 189         struct zynqmp_dpsub *dpsub;
 190         int ret;
 191
 192         /* Allocate private data. */
 193         dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL);
 194         if (!dpsub)
 195                 return -ENOMEM;
 196
 197         dpsub->dev = &pdev->dev;
 198         platform_set_drvdata(pdev, dpsub);
 199
 200         ret = dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
 201         if (ret)
 202                 return ret;
 203
 204         /* Try the reserved memory. Proceed if there's none. */
 205         of_reserved_mem_device_init(&pdev->dev);
 206
 207         ret = zynqmp_dpsub_init_clocks(dpsub);
 208         if (ret < 0)
 209                 goto err_mem;
 210
 211         ret = zynqmp_dpsub_parse_dt(dpsub);
 212         if (ret < 0)
 213                 goto err_mem;
 214
 215         pm_runtime_enable(&pdev->dev);
 216
 217         /*
 218          * DP should be probed first so that the zynqmp_disp can set the output
 219          * format accordingly.
 220          */
 221         ret = zynqmp_dp_probe(dpsub);
 222         if (ret)
 223                 goto err_pm;
 224
 225         ret = zynqmp_disp_probe(dpsub);
 226         if (ret)
 227                 goto err_dp;
 228
 229         drm_bridge_add(dpsub->bridge);
 230
 231         if (dpsub->dma_enabled) {
 232                 ret = zynqmp_dpsub_drm_init(dpsub);
 233                 if (ret)
 234                         goto err_disp;
 235         }
 236
 237         ret = zynqmp_audio_init(dpsub);
 238         if (ret)
 239                 goto err_drm_cleanup;
 240
 241         dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
 242
 243         return 0;
 244
 245 err_drm_cleanup:
 246         if (dpsub->drm)
 247                 zynqmp_dpsub_drm_cleanup(dpsub);
 248 err_disp:
 249         drm_bridge_remove(dpsub->bridge);
 250         zynqmp_disp_remove(dpsub);
 251 err_dp:
 252         zynqmp_dp_remove(dpsub);
 253 err_pm:
 254         pm_runtime_disable(&pdev->dev);
 255         clk_disable_unprepare(dpsub->apb_clk);
 256 err_mem:
 257         of_reserved_mem_device_release(&pdev->dev);
 258         if (!dpsub->drm)
 259                 zynqmp_dpsub_release(dpsub);
 260         return ret;
 261 }
 262
 263 static void zynqmp_dpsub_remove(struct platform_device *pdev)
 264 {
 265         struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
 266
 267         zynqmp_audio_uninit(dpsub);
 268
 269         if (dpsub->drm)
 270                 zynqmp_dpsub_drm_cleanup(dpsub);
 271
 272         drm_bridge_remove(dpsub->bridge);
 273         zynqmp_disp_remove(dpsub);
 274         zynqmp_dp_remove(dpsub);
 275
 276         pm_runtime_disable(&pdev->dev);
 277         clk_disable_unprepare(dpsub->apb_clk);
 278         of_reserved_mem_device_release(&pdev->dev);
 279
 280         if (!dpsub->drm)
 281                 zynqmp_dpsub_release(dpsub);
 282 }
 283
 284 static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
 285 {
 286         struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
 287
 288         if (!dpsub->drm)
 289                 return;
 290
 291         drm_atomic_helper_shutdown(&dpsub->drm->dev);
 292 }
 293
 294 static const struct of_device_id zynqmp_dpsub_of_match[] = {
 295         { .compatible = "xlnx,zynqmp-dpsub-1.7", },
 296         { /* end of table */ },
 297 };
 298 MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);
 299
 300 static struct platform_driver zynqmp_dpsub_driver = {
 301         .probe                  = zynqmp_dpsub_probe,
 302         .remove                 = zynqmp_dpsub_remove,
 303         .shutdown               = zynqmp_dpsub_shutdown,
 304         .driver                 = {
 305                 .name           = "zynqmp-dpsub",
 306                 .pm             = &zynqmp_dpsub_pm_ops,
 307                 .of_match_table = zynqmp_dpsub_of_match,
 308         },
 309 };
 310
 311 drm_module_platform_driver(zynqmp_dpsub_driver);
 312
 313 MODULE_AUTHOR("Xilinx, Inc.");
 314 MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
 315 MODULE_LICENSE("GPL v2");