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/clients/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_print.h> 19 #include <drm/drm_util.h> 20 21 #include "omap_drv.h" 22 #include "omap_fbdev.h" 23 24 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')"); 25 static bool ywrap_enabled = true; 26 module_param_named(ywrap, ywrap_enabled, bool, 0644); 27 28 /* 29 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 30 */ 31 32 struct omap_fbdev { 33 struct drm_device *dev; 34 bool ywrap_enabled; 35 36 /* for deferred dmm roll when getting called in atomic ctx */ 37 struct work_struct work; 38 }; 39 40 static struct drm_fb_helper *get_fb(struct fb_info *fbi); 41 42 static void pan_worker(struct work_struct *work) 43 { 44 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work); 45 struct drm_fb_helper *helper = fbdev->dev->fb_helper; 46 struct fb_info *fbi = helper->info; 47 struct drm_gem_object *bo = drm_gem_fb_get_obj(helper->fb, 0); 48 int npages; 49 50 /* DMM roll shifts in 4K pages: */ 51 npages = fbi->fix.line_length >> PAGE_SHIFT; 52 omap_gem_roll(bo, fbi->var.yoffset * npages); 53 } 54 55 FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(omap_fbdev, 56 drm_fb_helper_damage_range, 57 drm_fb_helper_damage_area) 58 59 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi) 60 { 61 struct drm_fb_helper *helper = get_fb(fbi); 62 struct omap_drm_private *priv; 63 struct omap_fbdev *fbdev; 64 65 if (!helper) 66 goto fallback; 67 68 priv = helper->dev->dev_private; 69 fbdev = priv->fbdev; 70 71 if (!fbdev->ywrap_enabled) 72 goto fallback; 73 74 if (drm_can_sleep()) 75 pan_worker(&fbdev->work); 76 else 77 queue_work(priv->wq, &fbdev->work); 78 79 return 0; 80 81 fallback: 82 return drm_fb_helper_pan_display(var, fbi); 83 } 84 85 static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 86 { 87 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 88 89 return fb_deferred_io_mmap(info, vma); 90 } 91 92 static void omap_fbdev_fb_destroy(struct fb_info *info) 93 { 94 struct drm_fb_helper *helper = info->par; 95 struct drm_framebuffer *fb = helper->fb; 96 struct drm_gem_object *bo = drm_gem_fb_get_obj(fb, 0); 97 98 DBG(); 99 100 fb_deferred_io_cleanup(info); 101 drm_fb_helper_fini(helper); 102 103 omap_gem_unpin(bo); 104 drm_framebuffer_remove(fb); 105 106 drm_client_release(&helper->client); 107 } 108 109 /* 110 * For now, we cannot use FB_DEFAULT_DEFERRED_OPS and fb_deferred_io_mmap() 111 * because we use write-combine. 112 */ 113 static const struct fb_ops omap_fb_ops = { 114 .owner = THIS_MODULE, 115 __FB_DEFAULT_DEFERRED_OPS_RDWR(omap_fbdev), 116 .fb_check_var = drm_fb_helper_check_var, 117 .fb_set_par = drm_fb_helper_set_par, 118 .fb_setcmap = drm_fb_helper_setcmap, 119 .fb_blank = drm_fb_helper_blank, 120 .fb_pan_display = omap_fbdev_pan_display, 121 __FB_DEFAULT_DEFERRED_OPS_DRAW(omap_fbdev), 122 .fb_ioctl = drm_fb_helper_ioctl, 123 .fb_mmap = omap_fbdev_fb_mmap, 124 .fb_destroy = omap_fbdev_fb_destroy, 125 }; 126 127 static int omap_fbdev_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip) 128 { 129 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2)) 130 return 0; 131 132 if (helper->fb->funcs->dirty) 133 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1); 134 135 return 0; 136 } 137 138 static const struct drm_fb_helper_funcs omap_fbdev_helper_funcs = { 139 .fb_dirty = omap_fbdev_dirty, 140 }; 141 142 static struct drm_fb_helper *get_fb(struct fb_info *fbi) 143 { 144 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) { 145 /* these are not the fb's you're looking for */ 146 return NULL; 147 } 148 return fbi->par; 149 } 150 151 int omap_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper, 152 struct drm_fb_helper_surface_size *sizes) 153 { 154 struct drm_device *dev = helper->dev; 155 struct omap_drm_private *priv = dev->dev_private; 156 struct omap_fbdev *fbdev = priv->fbdev; 157 struct drm_framebuffer *fb = NULL; 158 union omap_gem_size gsize; 159 struct fb_info *fbi = NULL; 160 struct drm_mode_fb_cmd2 mode_cmd = {0}; 161 struct drm_gem_object *bo; 162 dma_addr_t dma_addr; 163 int ret; 164 165 sizes->surface_bpp = 32; 166 sizes->surface_depth = 24; 167 168 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 169 sizes->surface_height, sizes->surface_bpp, 170 sizes->fb_width, sizes->fb_height); 171 172 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 173 sizes->surface_depth); 174 175 mode_cmd.width = sizes->surface_width; 176 mode_cmd.height = sizes->surface_height; 177 178 mode_cmd.pitches[0] = 179 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8); 180 181 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled; 182 if (fbdev->ywrap_enabled) { 183 /* need to align pitch to page size if using DMM scrolling */ 184 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]); 185 } 186 187 /* allocate backing bo */ 188 gsize = (union omap_gem_size){ 189 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height), 190 }; 191 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index); 192 bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC); 193 if (!bo) { 194 dev_err(dev->dev, "failed to allocate buffer object\n"); 195 ret = -ENOMEM; 196 goto fail; 197 } 198 199 fb = omap_framebuffer_init(dev, 200 drm_get_format_info(dev, mode_cmd.pixel_format, 201 mode_cmd.modifier[0]), 202 &mode_cmd, &bo); 203 if (IS_ERR(fb)) { 204 dev_err(dev->dev, "failed to allocate fb\n"); 205 /* note: if fb creation failed, we can't rely on fb destroy 206 * to unref the bo: 207 */ 208 drm_gem_object_put(bo); 209 ret = PTR_ERR(fb); 210 goto fail; 211 } 212 213 /* note: this keeps the bo pinned.. which is perhaps not ideal, 214 * but is needed as long as we use fb_mmap() to mmap to userspace 215 * (since this happens using fix.smem_start). Possibly we could 216 * implement our own mmap using GEM mmap support to avoid this 217 * (non-tiled buffer doesn't need to be pinned for fbcon to write 218 * to it). Then we just need to be sure that we are able to re- 219 * pin it in case of an opps. 220 */ 221 ret = omap_gem_pin(bo, &dma_addr); 222 if (ret) { 223 dev_err(dev->dev, "could not pin framebuffer\n"); 224 ret = -ENOMEM; 225 goto fail; 226 } 227 228 fbi = drm_fb_helper_alloc_info(helper); 229 if (IS_ERR(fbi)) { 230 dev_err(dev->dev, "failed to allocate fb info\n"); 231 ret = PTR_ERR(fbi); 232 goto fail; 233 } 234 235 DBG("fbi=%p, dev=%p", fbi, dev); 236 237 helper->funcs = &omap_fbdev_helper_funcs; 238 helper->fb = fb; 239 240 fbi->fbops = &omap_fb_ops; 241 242 drm_fb_helper_fill_info(fbi, helper, sizes); 243 244 fbi->flags |= FBINFO_VIRTFB; 245 fbi->screen_buffer = omap_gem_vaddr(bo); 246 fbi->screen_size = bo->size; 247 fbi->fix.smem_start = dma_addr; 248 fbi->fix.smem_len = bo->size; 249 250 /* deferred I/O */ 251 helper->fbdefio.delay = HZ / 20; 252 helper->fbdefio.deferred_io = drm_fb_helper_deferred_io; 253 254 fbi->fbdefio = &helper->fbdefio; 255 ret = fb_deferred_io_init(fbi); 256 if (ret) 257 goto fail; 258 259 /* if we have DMM, then we can use it for scrolling by just 260 * shuffling pages around in DMM rather than doing sw blit. 261 */ 262 if (fbdev->ywrap_enabled) { 263 DRM_INFO("Enabling DMM ywrap scrolling\n"); 264 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST; 265 fbi->fix.ywrapstep = 1; 266 } 267 268 269 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 270 DBG("allocated %dx%d fb", fb->width, fb->height); 271 272 return 0; 273 274 fail: 275 276 if (ret) { 277 if (fb) 278 drm_framebuffer_remove(fb); 279 } 280 281 return ret; 282 } 283 284 void omap_fbdev_setup(struct drm_device *dev) 285 { 286 struct omap_drm_private *priv = dev->dev_private; 287 struct omap_fbdev *fbdev; 288 289 drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); 290 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); 291 292 fbdev = drmm_kzalloc(dev, sizeof(*fbdev), GFP_KERNEL); 293 if (!fbdev) 294 return; 295 fbdev->dev = dev; 296 INIT_WORK(&fbdev->work, pan_worker); 297 298 priv->fbdev = fbdev; 299 300 drm_client_setup(dev, NULL); 301 } 302