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_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 } 107 108 /* 109 * For now, we cannot use FB_DEFAULT_DEFERRED_OPS and fb_deferred_io_mmap() 110 * because we use write-combine. 111 */ 112 static const struct fb_ops omap_fb_ops = { 113 .owner = THIS_MODULE, 114 __FB_DEFAULT_DEFERRED_OPS_RDWR(omap_fbdev), 115 .fb_check_var = drm_fb_helper_check_var, 116 .fb_set_par = drm_fb_helper_set_par, 117 .fb_setcmap = drm_fb_helper_setcmap, 118 .fb_blank = drm_fb_helper_blank, 119 .fb_pan_display = omap_fbdev_pan_display, 120 __FB_DEFAULT_DEFERRED_OPS_DRAW(omap_fbdev), 121 .fb_ioctl = drm_fb_helper_ioctl, 122 .fb_mmap = omap_fbdev_fb_mmap, 123 .fb_destroy = omap_fbdev_fb_destroy, 124 }; 125 126 static int omap_fbdev_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip) 127 { 128 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2)) 129 return 0; 130 131 if (helper->fb->funcs->dirty) 132 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1); 133 134 return 0; 135 } 136 137 static const struct drm_fb_helper_funcs omap_fbdev_helper_funcs = { 138 .fb_dirty = omap_fbdev_dirty, 139 }; 140 141 static struct drm_fb_helper *get_fb(struct fb_info *fbi) 142 { 143 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) { 144 /* these are not the fb's you're looking for */ 145 return NULL; 146 } 147 return fbi->par; 148 } 149 150 int omap_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper, 151 struct drm_fb_helper_surface_size *sizes) 152 { 153 struct drm_device *dev = helper->dev; 154 struct omap_drm_private *priv = dev->dev_private; 155 struct omap_fbdev *fbdev = priv->fbdev; 156 struct drm_framebuffer *fb = NULL; 157 union omap_gem_size gsize; 158 struct fb_info *fbi = NULL; 159 struct drm_mode_fb_cmd2 mode_cmd = {0}; 160 struct drm_gem_object *bo; 161 dma_addr_t dma_addr; 162 int ret; 163 164 sizes->surface_bpp = 32; 165 sizes->surface_depth = 24; 166 167 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 168 sizes->surface_height, sizes->surface_bpp, 169 sizes->fb_width, sizes->fb_height); 170 171 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 172 sizes->surface_depth); 173 174 mode_cmd.width = sizes->surface_width; 175 mode_cmd.height = sizes->surface_height; 176 177 mode_cmd.pitches[0] = 178 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8); 179 180 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled; 181 if (fbdev->ywrap_enabled) { 182 /* need to align pitch to page size if using DMM scrolling */ 183 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]); 184 } 185 186 /* allocate backing bo */ 187 gsize = (union omap_gem_size){ 188 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height), 189 }; 190 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index); 191 bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC); 192 if (!bo) { 193 dev_err(dev->dev, "failed to allocate buffer object\n"); 194 ret = -ENOMEM; 195 goto fail; 196 } 197 198 fb = omap_framebuffer_init(dev, 199 drm_get_format_info(dev, mode_cmd.pixel_format, 200 mode_cmd.modifier[0]), 201 &mode_cmd, &bo); 202 if (IS_ERR(fb)) { 203 dev_err(dev->dev, "failed to allocate fb\n"); 204 /* note: if fb creation failed, we can't rely on fb destroy 205 * to unref the bo: 206 */ 207 drm_gem_object_put(bo); 208 ret = PTR_ERR(fb); 209 goto fail; 210 } 211 212 /* note: this keeps the bo pinned.. which is perhaps not ideal, 213 * but is needed as long as we use fb_mmap() to mmap to userspace 214 * (since this happens using fix.smem_start). Possibly we could 215 * implement our own mmap using GEM mmap support to avoid this 216 * (non-tiled buffer doesn't need to be pinned for fbcon to write 217 * to it). Then we just need to be sure that we are able to re- 218 * pin it in case of an opps. 219 */ 220 ret = omap_gem_pin(bo, &dma_addr); 221 if (ret) { 222 dev_err(dev->dev, "could not pin framebuffer\n"); 223 ret = -ENOMEM; 224 goto fail; 225 } 226 227 fbi = drm_fb_helper_alloc_info(helper); 228 if (IS_ERR(fbi)) { 229 dev_err(dev->dev, "failed to allocate fb info\n"); 230 ret = PTR_ERR(fbi); 231 goto fail; 232 } 233 234 DBG("fbi=%p, dev=%p", fbi, dev); 235 236 helper->funcs = &omap_fbdev_helper_funcs; 237 helper->fb = fb; 238 239 fbi->fbops = &omap_fb_ops; 240 241 drm_fb_helper_fill_info(fbi, helper, sizes); 242 243 fbi->flags |= FBINFO_VIRTFB; 244 fbi->screen_buffer = omap_gem_vaddr(bo); 245 fbi->screen_size = bo->size; 246 fbi->fix.smem_start = dma_addr; 247 fbi->fix.smem_len = bo->size; 248 249 /* deferred I/O */ 250 helper->fbdefio.delay = HZ / 20; 251 helper->fbdefio.deferred_io = drm_fb_helper_deferred_io; 252 253 fbi->fbdefio = &helper->fbdefio; 254 ret = fb_deferred_io_init(fbi); 255 if (ret) 256 goto fail; 257 258 /* if we have DMM, then we can use it for scrolling by just 259 * shuffling pages around in DMM rather than doing sw blit. 260 */ 261 if (fbdev->ywrap_enabled) { 262 DRM_INFO("Enabling DMM ywrap scrolling\n"); 263 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST; 264 fbi->fix.ywrapstep = 1; 265 } 266 267 268 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 269 DBG("allocated %dx%d fb", fb->width, fb->height); 270 271 return 0; 272 273 fail: 274 275 if (ret) { 276 if (fb) 277 drm_framebuffer_remove(fb); 278 } 279 280 return ret; 281 } 282 283 void omap_fbdev_setup(struct drm_device *dev) 284 { 285 struct omap_drm_private *priv = dev->dev_private; 286 struct omap_fbdev *fbdev; 287 288 drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); 289 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); 290 291 fbdev = drmm_kzalloc(dev, sizeof(*fbdev), GFP_KERNEL); 292 if (!fbdev) 293 return; 294 fbdev->dev = dev; 295 INIT_WORK(&fbdev->work, pan_worker); 296 297 priv->fbdev = fbdev; 298 299 drm_client_setup(dev, NULL); 300 } 301