1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/ 4 * Author: Rob Clark <rob@ti.com> 5 */ 6 7 #include <linux/fb.h> 8 9 #include <drm/drm_client_setup.h> 10 #include <drm/drm_drv.h> 11 #include <drm/drm_crtc_helper.h> 12 #include <drm/drm_fb_helper.h> 13 #include <drm/drm_file.h> 14 #include <drm/drm_fourcc.h> 15 #include <drm/drm_framebuffer.h> 16 #include <drm/drm_gem_framebuffer_helper.h> 17 #include <drm/drm_managed.h> 18 #include <drm/drm_util.h> 19 20 #include "omap_drv.h" 21 #include "omap_fbdev.h" 22 23 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')"); 24 static bool ywrap_enabled = true; 25 module_param_named(ywrap, ywrap_enabled, bool, 0644); 26 27 /* 28 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 29 */ 30 31 struct omap_fbdev { 32 struct drm_device *dev; 33 bool ywrap_enabled; 34 35 /* for deferred dmm roll when getting called in atomic ctx */ 36 struct work_struct work; 37 }; 38 39 static struct drm_fb_helper *get_fb(struct fb_info *fbi); 40 41 static void pan_worker(struct work_struct *work) 42 { 43 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work); 44 struct drm_fb_helper *helper = fbdev->dev->fb_helper; 45 struct fb_info *fbi = helper->info; 46 struct drm_gem_object *bo = drm_gem_fb_get_obj(helper->fb, 0); 47 int npages; 48 49 /* DMM roll shifts in 4K pages: */ 50 npages = fbi->fix.line_length >> PAGE_SHIFT; 51 omap_gem_roll(bo, fbi->var.yoffset * npages); 52 } 53 54 FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(omap_fbdev, 55 drm_fb_helper_damage_range, 56 drm_fb_helper_damage_area) 57 58 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi) 59 { 60 struct drm_fb_helper *helper = get_fb(fbi); 61 struct omap_drm_private *priv; 62 struct omap_fbdev *fbdev; 63 64 if (!helper) 65 goto fallback; 66 67 priv = helper->dev->dev_private; 68 fbdev = priv->fbdev; 69 70 if (!fbdev->ywrap_enabled) 71 goto fallback; 72 73 if (drm_can_sleep()) 74 pan_worker(&fbdev->work); 75 else 76 queue_work(priv->wq, &fbdev->work); 77 78 return 0; 79 80 fallback: 81 return drm_fb_helper_pan_display(var, fbi); 82 } 83 84 static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 85 { 86 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 87 88 return fb_deferred_io_mmap(info, vma); 89 } 90 91 static void omap_fbdev_fb_destroy(struct fb_info *info) 92 { 93 struct drm_fb_helper *helper = info->par; 94 struct drm_framebuffer *fb = helper->fb; 95 struct drm_gem_object *bo = drm_gem_fb_get_obj(fb, 0); 96 97 DBG(); 98 99 fb_deferred_io_cleanup(info); 100 drm_fb_helper_fini(helper); 101 102 omap_gem_unpin(bo); 103 drm_framebuffer_remove(fb); 104 105 drm_client_release(&helper->client); 106 drm_fb_helper_unprepare(helper); 107 kfree(helper); 108 } 109 110 /* 111 * For now, we cannot use FB_DEFAULT_DEFERRED_OPS and fb_deferred_io_mmap() 112 * because we use write-combine. 113 */ 114 static const struct fb_ops omap_fb_ops = { 115 .owner = THIS_MODULE, 116 __FB_DEFAULT_DEFERRED_OPS_RDWR(omap_fbdev), 117 .fb_check_var = drm_fb_helper_check_var, 118 .fb_set_par = drm_fb_helper_set_par, 119 .fb_setcmap = drm_fb_helper_setcmap, 120 .fb_blank = drm_fb_helper_blank, 121 .fb_pan_display = omap_fbdev_pan_display, 122 __FB_DEFAULT_DEFERRED_OPS_DRAW(omap_fbdev), 123 .fb_ioctl = drm_fb_helper_ioctl, 124 .fb_mmap = omap_fbdev_fb_mmap, 125 .fb_destroy = omap_fbdev_fb_destroy, 126 }; 127 128 static int omap_fbdev_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip) 129 { 130 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2)) 131 return 0; 132 133 if (helper->fb->funcs->dirty) 134 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1); 135 136 return 0; 137 } 138 139 static const struct drm_fb_helper_funcs omap_fbdev_helper_funcs = { 140 .fb_dirty = omap_fbdev_dirty, 141 }; 142 143 static struct drm_fb_helper *get_fb(struct fb_info *fbi) 144 { 145 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) { 146 /* these are not the fb's you're looking for */ 147 return NULL; 148 } 149 return fbi->par; 150 } 151 152 int omap_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper, 153 struct drm_fb_helper_surface_size *sizes) 154 { 155 struct drm_device *dev = helper->dev; 156 struct omap_drm_private *priv = dev->dev_private; 157 struct omap_fbdev *fbdev = priv->fbdev; 158 struct drm_framebuffer *fb = NULL; 159 union omap_gem_size gsize; 160 struct fb_info *fbi = NULL; 161 struct drm_mode_fb_cmd2 mode_cmd = {0}; 162 struct drm_gem_object *bo; 163 dma_addr_t dma_addr; 164 int ret; 165 166 sizes->surface_bpp = 32; 167 sizes->surface_depth = 24; 168 169 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 170 sizes->surface_height, sizes->surface_bpp, 171 sizes->fb_width, sizes->fb_height); 172 173 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 174 sizes->surface_depth); 175 176 mode_cmd.width = sizes->surface_width; 177 mode_cmd.height = sizes->surface_height; 178 179 mode_cmd.pitches[0] = 180 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8); 181 182 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled; 183 if (fbdev->ywrap_enabled) { 184 /* need to align pitch to page size if using DMM scrolling */ 185 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]); 186 } 187 188 /* allocate backing bo */ 189 gsize = (union omap_gem_size){ 190 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height), 191 }; 192 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index); 193 bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC); 194 if (!bo) { 195 dev_err(dev->dev, "failed to allocate buffer object\n"); 196 ret = -ENOMEM; 197 goto fail; 198 } 199 200 fb = omap_framebuffer_init(dev, &mode_cmd, &bo); 201 if (IS_ERR(fb)) { 202 dev_err(dev->dev, "failed to allocate fb\n"); 203 /* note: if fb creation failed, we can't rely on fb destroy 204 * to unref the bo: 205 */ 206 drm_gem_object_put(bo); 207 ret = PTR_ERR(fb); 208 goto fail; 209 } 210 211 /* note: this keeps the bo pinned.. which is perhaps not ideal, 212 * but is needed as long as we use fb_mmap() to mmap to userspace 213 * (since this happens using fix.smem_start). Possibly we could 214 * implement our own mmap using GEM mmap support to avoid this 215 * (non-tiled buffer doesn't need to be pinned for fbcon to write 216 * to it). Then we just need to be sure that we are able to re- 217 * pin it in case of an opps. 218 */ 219 ret = omap_gem_pin(bo, &dma_addr); 220 if (ret) { 221 dev_err(dev->dev, "could not pin framebuffer\n"); 222 ret = -ENOMEM; 223 goto fail; 224 } 225 226 fbi = drm_fb_helper_alloc_info(helper); 227 if (IS_ERR(fbi)) { 228 dev_err(dev->dev, "failed to allocate fb info\n"); 229 ret = PTR_ERR(fbi); 230 goto fail; 231 } 232 233 DBG("fbi=%p, dev=%p", fbi, dev); 234 235 helper->funcs = &omap_fbdev_helper_funcs; 236 helper->fb = fb; 237 238 fbi->fbops = &omap_fb_ops; 239 240 drm_fb_helper_fill_info(fbi, helper, sizes); 241 242 fbi->flags |= FBINFO_VIRTFB; 243 fbi->screen_buffer = omap_gem_vaddr(bo); 244 fbi->screen_size = bo->size; 245 fbi->fix.smem_start = dma_addr; 246 fbi->fix.smem_len = bo->size; 247 248 /* deferred I/O */ 249 helper->fbdefio.delay = HZ / 20; 250 helper->fbdefio.deferred_io = drm_fb_helper_deferred_io; 251 252 fbi->fbdefio = &helper->fbdefio; 253 ret = fb_deferred_io_init(fbi); 254 if (ret) 255 goto fail; 256 257 /* if we have DMM, then we can use it for scrolling by just 258 * shuffling pages around in DMM rather than doing sw blit. 259 */ 260 if (fbdev->ywrap_enabled) { 261 DRM_INFO("Enabling DMM ywrap scrolling\n"); 262 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST; 263 fbi->fix.ywrapstep = 1; 264 } 265 266 267 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 268 DBG("allocated %dx%d fb", fb->width, fb->height); 269 270 return 0; 271 272 fail: 273 274 if (ret) { 275 if (fb) 276 drm_framebuffer_remove(fb); 277 } 278 279 return ret; 280 } 281 282 void omap_fbdev_setup(struct drm_device *dev) 283 { 284 struct omap_drm_private *priv = dev->dev_private; 285 struct omap_fbdev *fbdev; 286 287 drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); 288 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); 289 290 fbdev = drmm_kzalloc(dev, sizeof(*fbdev), GFP_KERNEL); 291 if (!fbdev) 292 return; 293 fbdev->dev = dev; 294 INIT_WORK(&fbdev->work, pan_worker); 295 296 priv->fbdev = fbdev; 297 298 drm_client_setup(dev, NULL); 299 } 300