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 <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_reserved_mem.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_device.h>
  21 #include <drm/drm_drv.h>
  22 #include <drm/drm_fb_helper.h>
  23 #include <drm/drm_fourcc.h>
  24 #include <drm/drm_gem_cma_helper.h>
  25 #include <drm/drm_gem_framebuffer_helper.h>
  26 #include <drm/drm_managed.h>
  27 #include <drm/drm_mode_config.h>
  28 #include <drm/drm_module.h>
  29 #include <drm/drm_probe_helper.h>
  30 #include <drm/drm_vblank.h>
  31
  32 #include "zynqmp_disp.h"
  33 #include "zynqmp_dp.h"
  34 #include "zynqmp_dpsub.h"
  35
  36 /* -----------------------------------------------------------------------------
  37  * Dumb Buffer & Framebuffer Allocation
  38  */
  39
  40 static int zynqmp_dpsub_dumb_create(struct drm_file *file_priv,
  41                                     struct drm_device *drm,
  42                                     struct drm_mode_create_dumb *args)
  43 {
  44         struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
  45         unsigned int pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  46
  47         /* Enforce the alignment constraints of the DMA engine. */
  48         args->pitch = ALIGN(pitch, dpsub->dma_align);
  49
  50         return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
  51 }
  52
  53 static struct drm_framebuffer *
  54 zynqmp_dpsub_fb_create(struct drm_device *drm, struct drm_file *file_priv,
  55                        const struct drm_mode_fb_cmd2 *mode_cmd)
  56 {
  57         struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
  58         struct drm_mode_fb_cmd2 cmd = *mode_cmd;
  59         unsigned int i;
  60
  61         /* Enforce the alignment constraints of the DMA engine. */
  62         for (i = 0; i < ARRAY_SIZE(cmd.pitches); ++i)
  63                 cmd.pitches[i] = ALIGN(cmd.pitches[i], dpsub->dma_align);
  64
  65         return drm_gem_fb_create(drm, file_priv, &cmd);
  66 }
  67
  68 static const struct drm_mode_config_funcs zynqmp_dpsub_mode_config_funcs = {
  69         .fb_create              = zynqmp_dpsub_fb_create,
  70         .atomic_check           = drm_atomic_helper_check,
  71         .atomic_commit          = drm_atomic_helper_commit,
  72 };
  73
  74 /* -----------------------------------------------------------------------------
  75  * DRM/KMS Driver
  76  */
  77
  78 DEFINE_DRM_GEM_CMA_FOPS(zynqmp_dpsub_drm_fops);
  79
  80 static const struct drm_driver zynqmp_dpsub_drm_driver = {
  81         .driver_features                = DRIVER_MODESET | DRIVER_GEM |
  82                                           DRIVER_ATOMIC,
  83
  84         DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(zynqmp_dpsub_dumb_create),
  85
  86         .fops                           = &zynqmp_dpsub_drm_fops,
  87
  88         .name                           = "zynqmp-dpsub",
  89         .desc                           = "Xilinx DisplayPort Subsystem Driver",
  90         .date                           = "20130509",
  91         .major                          = 1,
  92         .minor                          = 0,
  93 };
  94
  95 static int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
  96 {
  97         struct drm_device *drm = &dpsub->drm;
  98         int ret;
  99
 100         /* Initialize mode config, vblank and the KMS poll helper. */
 101         ret = drmm_mode_config_init(drm);
 102         if (ret < 0)
 103                 return ret;
 104
 105         drm->mode_config.funcs = &zynqmp_dpsub_mode_config_funcs;
 106         drm->mode_config.min_width = 0;
 107         drm->mode_config.min_height = 0;
 108         drm->mode_config.max_width = ZYNQMP_DISP_MAX_WIDTH;
 109         drm->mode_config.max_height = ZYNQMP_DISP_MAX_HEIGHT;
 110
 111         ret = drm_vblank_init(drm, 1);
 112         if (ret)
 113                 return ret;
 114
 115         drm_kms_helper_poll_init(drm);
 116
 117         /*
 118          * Initialize the DISP and DP components. This will creates planes,
 119          * CRTC, encoder and connector. The DISP should be initialized first as
 120          * the DP encoder needs the CRTC.
 121          */
 122         ret = zynqmp_disp_drm_init(dpsub);
 123         if (ret)
 124                 goto err_poll_fini;
 125
 126         ret = zynqmp_dp_drm_init(dpsub);
 127         if (ret)
 128                 goto err_poll_fini;
 129
 130         /* Reset all components and register the DRM device. */
 131         drm_mode_config_reset(drm);
 132
 133         ret = drm_dev_register(drm, 0);
 134         if (ret < 0)
 135                 goto err_poll_fini;
 136
 137         /* Initialize fbdev generic emulation. */
 138         drm_fbdev_generic_setup(drm, 24);
 139
 140         return 0;
 141
 142 err_poll_fini:
 143         drm_kms_helper_poll_fini(drm);
 144         return ret;
 145 }
 146
 147 /* -----------------------------------------------------------------------------
 148  * Power Management
 149  */
 150
 151 static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)
 152 {
 153         struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
 154
 155         return drm_mode_config_helper_suspend(&dpsub->drm);
 156 }
 157
 158 static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)
 159 {
 160         struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
 161
 162         return drm_mode_config_helper_resume(&dpsub->drm);
 163 }
 164
 165 static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {
 166         SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)
 167 };
 168
 169 /* -----------------------------------------------------------------------------
 170  * Probe & Remove
 171  */
 172
 173 static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
 174 {
 175         int ret;
 176
 177         dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
 178         if (IS_ERR(dpsub->apb_clk))
 179                 return PTR_ERR(dpsub->apb_clk);
 180
 181         ret = clk_prepare_enable(dpsub->apb_clk);
 182         if (ret) {
 183                 dev_err(dpsub->dev, "failed to enable the APB clock\n");
 184                 return ret;
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int zynqmp_dpsub_probe(struct platform_device *pdev)
 191 {
 192         struct zynqmp_dpsub *dpsub;
 193         int ret;
 194
 195         /* Allocate private data. */
 196         dpsub = devm_drm_dev_alloc(&pdev->dev, &zynqmp_dpsub_drm_driver,
 197                                    struct zynqmp_dpsub, drm);
 198         if (IS_ERR(dpsub))
 199                 return PTR_ERR(dpsub);
 200
 201         dpsub->dev = &pdev->dev;
 202         platform_set_drvdata(pdev, dpsub);
 203
 204         dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
 205
 206         /* Try the reserved memory. Proceed if there's none. */
 207         of_reserved_mem_device_init(&pdev->dev);
 208
 209         ret = zynqmp_dpsub_init_clocks(dpsub);
 210         if (ret < 0)
 211                 goto err_mem;
 212
 213         pm_runtime_enable(&pdev->dev);
 214
 215         /*
 216          * DP should be probed first so that the zynqmp_disp can set the output
 217          * format accordingly.
 218          */
 219         ret = zynqmp_dp_probe(dpsub, &dpsub->drm);
 220         if (ret)
 221                 goto err_pm;
 222
 223         ret = zynqmp_disp_probe(dpsub, &dpsub->drm);
 224         if (ret)
 225                 goto err_dp;
 226
 227         ret = zynqmp_dpsub_drm_init(dpsub);
 228         if (ret)
 229                 goto err_disp;
 230
 231         dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
 232
 233         return 0;
 234
 235 err_disp:
 236         zynqmp_disp_remove(dpsub);
 237 err_dp:
 238         zynqmp_dp_remove(dpsub);
 239 err_pm:
 240         pm_runtime_disable(&pdev->dev);
 241         clk_disable_unprepare(dpsub->apb_clk);
 242 err_mem:
 243         of_reserved_mem_device_release(&pdev->dev);
 244         return ret;
 245 }
 246
 247 static int zynqmp_dpsub_remove(struct platform_device *pdev)
 248 {
 249         struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
 250         struct drm_device *drm = &dpsub->drm;
 251
 252         drm_dev_unregister(drm);
 253         drm_atomic_helper_shutdown(drm);
 254         drm_kms_helper_poll_fini(drm);
 255
 256         zynqmp_disp_remove(dpsub);
 257         zynqmp_dp_remove(dpsub);
 258
 259         pm_runtime_disable(&pdev->dev);
 260         clk_disable_unprepare(dpsub->apb_clk);
 261         of_reserved_mem_device_release(&pdev->dev);
 262
 263         return 0;
 264 }
 265
 266 static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
 267 {
 268         struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
 269
 270         drm_atomic_helper_shutdown(&dpsub->drm);
 271 }
 272
 273 static const struct of_device_id zynqmp_dpsub_of_match[] = {
 274         { .compatible = "xlnx,zynqmp-dpsub-1.7", },
 275         { /* end of table */ },
 276 };
 277 MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);
 278
 279 static struct platform_driver zynqmp_dpsub_driver = {
 280         .probe                  = zynqmp_dpsub_probe,
 281         .remove                 = zynqmp_dpsub_remove,
 282         .shutdown               = zynqmp_dpsub_shutdown,
 283         .driver                 = {
 284                 .name           = "zynqmp-dpsub",
 285                 .pm             = &zynqmp_dpsub_pm_ops,
 286                 .of_match_table = zynqmp_dpsub_of_match,
 287         },
 288 };
 289
 290 drm_module_platform_driver(zynqmp_dpsub_driver);
 291
 292 MODULE_AUTHOR("Xilinx, Inc.");
 293 MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
 294 MODULE_LICENSE("GPL v2");