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