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_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->irq_enabled = 1;
 115
 116         drm_kms_helper_poll_init(drm);
 117
 118         /*
 119          * Initialize the DISP and DP components. This will creates planes,
 120          * CRTC, encoder and connector. The DISP should be initialized first as
 121          * the DP encoder needs the CRTC.
 122          */
 123         ret = zynqmp_disp_drm_init(dpsub);
 124         if (ret)
 125                 goto err_poll_fini;
 126
 127         ret = zynqmp_dp_drm_init(dpsub);
 128         if (ret)
 129                 goto err_poll_fini;
 130
 131         /* Reset all components and register the DRM device. */
 132         drm_mode_config_reset(drm);
 133
 134         ret = drm_dev_register(drm, 0);
 135         if (ret < 0)
 136                 goto err_poll_fini;
 137
 138         /* Initialize fbdev generic emulation. */
 139         drm_fbdev_generic_setup(drm, 24);
 140
 141         return 0;
 142
 143 err_poll_fini:
 144         drm_kms_helper_poll_fini(drm);
 145         return ret;
 146 }
 147
 148 /* -----------------------------------------------------------------------------
 149  * Power Management
 150  */
 151
 152 static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)
 153 {
 154         struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
 155
 156         return drm_mode_config_helper_suspend(&dpsub->drm);
 157 }
 158
 159 static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)
 160 {
 161         struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
 162
 163         return drm_mode_config_helper_resume(&dpsub->drm);
 164 }
 165
 166 static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {
 167         SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)
 168 };
 169
 170 /* -----------------------------------------------------------------------------
 171  * Probe & Remove
 172  */
 173
 174 static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
 175 {
 176         int ret;
 177
 178         dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
 179         if (IS_ERR(dpsub->apb_clk))
 180                 return PTR_ERR(dpsub->apb_clk);
 181
 182         ret = clk_prepare_enable(dpsub->apb_clk);
 183         if (ret) {
 184                 dev_err(dpsub->dev, "failed to enable the APB clock\n");
 185                 return ret;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int zynqmp_dpsub_probe(struct platform_device *pdev)
 192 {
 193         struct zynqmp_dpsub *dpsub;
 194         int ret;
 195
 196         /* Allocate private data. */
 197         dpsub = devm_drm_dev_alloc(&pdev->dev, &zynqmp_dpsub_drm_driver,
 198                                    struct zynqmp_dpsub, drm);
 199         if (IS_ERR(dpsub))
 200                 return PTR_ERR(dpsub);
 201
 202         dpsub->dev = &pdev->dev;
 203         platform_set_drvdata(pdev, dpsub);
 204
 205         dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
 206
 207         /* Try the reserved memory. Proceed if there's none. */
 208         of_reserved_mem_device_init(&pdev->dev);
 209
 210         ret = zynqmp_dpsub_init_clocks(dpsub);
 211         if (ret < 0)
 212                 goto err_mem;
 213
 214         pm_runtime_enable(&pdev->dev);
 215
 216         /*
 217          * DP should be probed first so that the zynqmp_disp can set the output
 218          * format accordingly.
 219          */
 220         ret = zynqmp_dp_probe(dpsub, &dpsub->drm);
 221         if (ret)
 222                 goto err_pm;
 223
 224         ret = zynqmp_disp_probe(dpsub, &dpsub->drm);
 225         if (ret)
 226                 goto err_dp;
 227
 228         ret = zynqmp_dpsub_drm_init(dpsub);
 229         if (ret)
 230                 goto err_disp;
 231
 232         dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
 233
 234         return 0;
 235
 236 err_disp:
 237         zynqmp_disp_remove(dpsub);
 238 err_dp:
 239         zynqmp_dp_remove(dpsub);
 240 err_pm:
 241         pm_runtime_disable(&pdev->dev);
 242         clk_disable_unprepare(dpsub->apb_clk);
 243 err_mem:
 244         of_reserved_mem_device_release(&pdev->dev);
 245         return ret;
 246 }
 247
 248 static int zynqmp_dpsub_remove(struct platform_device *pdev)
 249 {
 250         struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
 251         struct drm_device *drm = &dpsub->drm;
 252
 253         drm_dev_unregister(drm);
 254         drm_atomic_helper_shutdown(drm);
 255         drm_kms_helper_poll_fini(drm);
 256
 257         zynqmp_disp_remove(dpsub);
 258         zynqmp_dp_remove(dpsub);
 259
 260         pm_runtime_disable(&pdev->dev);
 261         clk_disable_unprepare(dpsub->apb_clk);
 262         of_reserved_mem_device_release(&pdev->dev);
 263
 264         return 0;
 265 }
 266
 267 static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
 268 {
 269         struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
 270
 271         drm_atomic_helper_shutdown(&dpsub->drm);
 272 }
 273
 274 static const struct of_device_id zynqmp_dpsub_of_match[] = {
 275         { .compatible = "xlnx,zynqmp-dpsub-1.7", },
 276         { /* end of table */ },
 277 };
 278 MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);
 279
 280 static struct platform_driver zynqmp_dpsub_driver = {
 281         .probe                  = zynqmp_dpsub_probe,
 282         .remove                 = zynqmp_dpsub_remove,
 283         .shutdown               = zynqmp_dpsub_shutdown,
 284         .driver                 = {
 285                 .name           = "zynqmp-dpsub",
 286                 .pm             = &zynqmp_dpsub_pm_ops,
 287                 .of_match_table = zynqmp_dpsub_of_match,
 288         },
 289 };
 290
 291 module_platform_driver(zynqmp_dpsub_driver);
 292
 293 MODULE_AUTHOR("Xilinx, Inc.");
 294 MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
 295 MODULE_LICENSE("GPL v2");