drivers/gpu/drm/msm/msm_fbdev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include <drm/drm_drv.h>
   8 #include <drm/drm_crtc_helper.h>
   9 #include <drm/drm_fb_helper.h>
  10 #include <drm/drm_fourcc.h>
  11 #include <drm/drm_framebuffer.h>
  12 #include <drm/drm_prime.h>
  13
  14 #include "msm_drv.h"
  15 #include "msm_gem.h"
  16 #include "msm_kms.h"
  17
  18 static bool fbdev = true;
  19 MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
  20 module_param(fbdev, bool, 0600);
  21
  22 /*
  23  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  24  */
  25
  26 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
  27 {
  28         struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
  29         struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0);
  30
  31         return drm_gem_prime_mmap(bo, vma);
  32 }
  33
  34 static void msm_fbdev_fb_destroy(struct fb_info *info)
  35 {
  36         struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
  37         struct drm_framebuffer *fb = helper->fb;
  38         struct drm_gem_object *bo = msm_framebuffer_bo(fb, 0);
  39
  40         DBG();
  41
  42         drm_fb_helper_fini(helper);
  43
  44         /* this will free the backing object */
  45         msm_gem_put_vaddr(bo);
  46         drm_framebuffer_remove(fb);
  47
  48         drm_client_release(&helper->client);
  49         drm_fb_helper_unprepare(helper);
  50         kfree(helper);
  51 }
  52
  53 static const struct fb_ops msm_fb_ops = {
  54         .owner = THIS_MODULE,
  55         DRM_FB_HELPER_DEFAULT_OPS,
  56
  57         /* Note: to properly handle manual update displays, we wrap the
  58          * basic fbdev ops which write to the framebuffer
  59          */
  60         .fb_read = drm_fb_helper_sys_read,
  61         .fb_write = drm_fb_helper_sys_write,
  62         .fb_fillrect = drm_fb_helper_sys_fillrect,
  63         .fb_copyarea = drm_fb_helper_sys_copyarea,
  64         .fb_imageblit = drm_fb_helper_sys_imageblit,
  65         .fb_mmap = msm_fbdev_mmap,
  66         .fb_destroy = msm_fbdev_fb_destroy,
  67 };
  68
  69 static int msm_fbdev_create(struct drm_fb_helper *helper,
  70                 struct drm_fb_helper_surface_size *sizes)
  71 {
  72         struct drm_device *dev = helper->dev;
  73         struct msm_drm_private *priv = dev->dev_private;
  74         struct drm_framebuffer *fb = NULL;
  75         struct drm_gem_object *bo;
  76         struct fb_info *fbi = NULL;
  77         uint64_t paddr;
  78         uint32_t format;
  79         int ret, pitch;
  80
  81         format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
  82
  83         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  84                         sizes->surface_height, sizes->surface_bpp,
  85                         sizes->fb_width, sizes->fb_height);
  86
  87         pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
  88         fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
  89                         sizes->surface_height, pitch, format);
  90
  91         if (IS_ERR(fb)) {
  92                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
  93                 return PTR_ERR(fb);
  94         }
  95
  96         bo = msm_framebuffer_bo(fb, 0);
  97
  98         /*
  99          * NOTE: if we can be guaranteed to be able to map buffer
 100          * in panic (ie. lock-safe, etc) we could avoid pinning the
 101          * buffer now:
 102          */
 103         ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
 104         if (ret) {
 105                 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 106                 goto fail;
 107         }
 108
 109         fbi = drm_fb_helper_alloc_info(helper);
 110         if (IS_ERR(fbi)) {
 111                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
 112                 ret = PTR_ERR(fbi);
 113                 goto fail;
 114         }
 115
 116         DBG("fbi=%p, dev=%p", fbi, dev);
 117
 118         helper->fb = fb;
 119
 120         fbi->fbops = &msm_fb_ops;
 121
 122         drm_fb_helper_fill_info(fbi, helper, sizes);
 123
 124         fbi->screen_base = msm_gem_get_vaddr(bo);
 125         if (IS_ERR(fbi->screen_base)) {
 126                 ret = PTR_ERR(fbi->screen_base);
 127                 goto fail;
 128         }
 129         fbi->screen_size = bo->size;
 130         fbi->fix.smem_start = paddr;
 131         fbi->fix.smem_len = bo->size;
 132
 133         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 134         DBG("allocated %dx%d fb", fb->width, fb->height);
 135
 136         return 0;
 137
 138 fail:
 139         drm_framebuffer_remove(fb);
 140         return ret;
 141 }
 142
 143 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 144         .fb_probe = msm_fbdev_create,
 145 };
 146
 147 /*
 148  * struct drm_client
 149  */
 150
 151 static void msm_fbdev_client_unregister(struct drm_client_dev *client)
 152 {
 153         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 154
 155         if (fb_helper->info) {
 156                 drm_fb_helper_unregister_info(fb_helper);
 157         } else {
 158                 drm_client_release(&fb_helper->client);
 159                 drm_fb_helper_unprepare(fb_helper);
 160                 kfree(fb_helper);
 161         }
 162 }
 163
 164 static int msm_fbdev_client_restore(struct drm_client_dev *client)
 165 {
 166         drm_fb_helper_lastclose(client->dev);
 167
 168         return 0;
 169 }
 170
 171 static int msm_fbdev_client_hotplug(struct drm_client_dev *client)
 172 {
 173         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 174         struct drm_device *dev = client->dev;
 175         int ret;
 176
 177         if (dev->fb_helper)
 178                 return drm_fb_helper_hotplug_event(dev->fb_helper);
 179
 180         ret = drm_fb_helper_init(dev, fb_helper);
 181         if (ret)
 182                 goto err_drm_err;
 183
 184         if (!drm_drv_uses_atomic_modeset(dev))
 185                 drm_helper_disable_unused_functions(dev);
 186
 187         ret = drm_fb_helper_initial_config(fb_helper);
 188         if (ret)
 189                 goto err_drm_fb_helper_fini;
 190
 191         return 0;
 192
 193 err_drm_fb_helper_fini:
 194         drm_fb_helper_fini(fb_helper);
 195 err_drm_err:
 196         drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);
 197         return ret;
 198 }
 199
 200 static const struct drm_client_funcs msm_fbdev_client_funcs = {
 201         .owner          = THIS_MODULE,
 202         .unregister     = msm_fbdev_client_unregister,
 203         .restore        = msm_fbdev_client_restore,
 204         .hotplug        = msm_fbdev_client_hotplug,
 205 };
 206
 207 /* initialize fbdev helper */
 208 void msm_fbdev_setup(struct drm_device *dev)
 209 {
 210         struct drm_fb_helper *helper;
 211         int ret;
 212
 213         if (!fbdev)
 214                 return;
 215
 216         drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
 217         drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
 218
 219         helper = kzalloc(sizeof(*helper), GFP_KERNEL);
 220         if (!helper)
 221                 return;
 222         drm_fb_helper_prepare(dev, helper, 32, &msm_fb_helper_funcs);
 223
 224         ret = drm_client_init(dev, &helper->client, "fbdev", &msm_fbdev_client_funcs);
 225         if (ret) {
 226                 drm_err(dev, "Failed to register client: %d\n", ret);
 227                 goto err_drm_fb_helper_unprepare;
 228         }
 229
 230         ret = msm_fbdev_client_hotplug(&helper->client);
 231         if (ret)
 232                 drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
 233
 234         drm_client_register(&helper->client);
 235
 236         return;
 237
 238 err_drm_fb_helper_unprepare:
 239         drm_fb_helper_unprepare(helper);
 240         kfree(helper);
 241 }