]> Git Repo - J-linux.git/blob - drivers/gpu/drm/omapdrm/omap_fbdev.c
drm/omapdrm: Remove struct drm_fb_helper from struct omap_fbdev.
[J-linux.git] / drivers / gpu / drm / omapdrm / omap_fbdev.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
4  * Author: Rob Clark <[email protected]>
5  */
6
7 #include <linux/fb.h>
8
9 #include <drm/drm_drv.h>
10 #include <drm/drm_crtc_helper.h>
11 #include <drm/drm_fb_helper.h>
12 #include <drm/drm_file.h>
13 #include <drm/drm_fourcc.h>
14 #include <drm/drm_framebuffer.h>
15 #include <drm/drm_gem_framebuffer_helper.h>
16 #include <drm/drm_managed.h>
17 #include <drm/drm_util.h>
18
19 #include "omap_drv.h"
20 #include "omap_fbdev.h"
21
22 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
23 static bool ywrap_enabled = true;
24 module_param_named(ywrap, ywrap_enabled, bool, 0644);
25
26 /*
27  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
28  */
29
30 struct omap_fbdev {
31         struct drm_device *dev;
32         bool ywrap_enabled;
33
34         /* for deferred dmm roll when getting called in atomic ctx */
35         struct work_struct work;
36 };
37
38 static struct drm_fb_helper *get_fb(struct fb_info *fbi);
39
40 static void pan_worker(struct work_struct *work)
41 {
42         struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
43         struct drm_fb_helper *helper = fbdev->dev->fb_helper;
44         struct fb_info *fbi = helper->info;
45         struct drm_gem_object *bo = drm_gem_fb_get_obj(helper->fb, 0);
46         int npages;
47
48         /* DMM roll shifts in 4K pages: */
49         npages = fbi->fix.line_length >> PAGE_SHIFT;
50         omap_gem_roll(bo, fbi->var.yoffset * npages);
51 }
52
53 FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(omap_fbdev,
54                                    drm_fb_helper_damage_range,
55                                    drm_fb_helper_damage_area)
56
57 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
58 {
59         struct drm_fb_helper *helper = get_fb(fbi);
60         struct omap_drm_private *priv;
61         struct omap_fbdev *fbdev;
62
63         if (!helper)
64                 goto fallback;
65
66         priv = helper->dev->dev_private;
67         fbdev = priv->fbdev;
68
69         if (!fbdev->ywrap_enabled)
70                 goto fallback;
71
72         if (drm_can_sleep())
73                 pan_worker(&fbdev->work);
74         else
75                 queue_work(priv->wq, &fbdev->work);
76
77         return 0;
78
79 fallback:
80         return drm_fb_helper_pan_display(var, fbi);
81 }
82
83 static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
84 {
85         vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
86
87         return fb_deferred_io_mmap(info, vma);
88 }
89
90 static void omap_fbdev_fb_destroy(struct fb_info *info)
91 {
92         struct drm_fb_helper *helper = info->par;
93         struct drm_framebuffer *fb = helper->fb;
94         struct drm_gem_object *bo = drm_gem_fb_get_obj(fb, 0);
95
96         DBG();
97
98         fb_deferred_io_cleanup(info);
99         drm_fb_helper_fini(helper);
100
101         omap_gem_unpin(bo);
102         drm_framebuffer_remove(fb);
103
104         drm_client_release(&helper->client);
105         drm_fb_helper_unprepare(helper);
106         kfree(helper);
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_create(struct drm_fb_helper *helper,
128                 struct drm_fb_helper_surface_size *sizes)
129 {
130         struct drm_device *dev = helper->dev;
131         struct omap_drm_private *priv = dev->dev_private;
132         struct omap_fbdev *fbdev = priv->fbdev;
133         struct drm_framebuffer *fb = NULL;
134         union omap_gem_size gsize;
135         struct fb_info *fbi = NULL;
136         struct drm_mode_fb_cmd2 mode_cmd = {0};
137         struct drm_gem_object *bo;
138         dma_addr_t dma_addr;
139         int ret;
140
141         sizes->surface_bpp = 32;
142         sizes->surface_depth = 24;
143
144         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
145                         sizes->surface_height, sizes->surface_bpp,
146                         sizes->fb_width, sizes->fb_height);
147
148         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
149                         sizes->surface_depth);
150
151         mode_cmd.width = sizes->surface_width;
152         mode_cmd.height = sizes->surface_height;
153
154         mode_cmd.pitches[0] =
155                         DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);
156
157         fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
158         if (fbdev->ywrap_enabled) {
159                 /* need to align pitch to page size if using DMM scrolling */
160                 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
161         }
162
163         /* allocate backing bo */
164         gsize = (union omap_gem_size){
165                 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
166         };
167         DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
168         bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
169         if (!bo) {
170                 dev_err(dev->dev, "failed to allocate buffer object\n");
171                 ret = -ENOMEM;
172                 goto fail;
173         }
174
175         fb = omap_framebuffer_init(dev, &mode_cmd, &bo);
176         if (IS_ERR(fb)) {
177                 dev_err(dev->dev, "failed to allocate fb\n");
178                 /* note: if fb creation failed, we can't rely on fb destroy
179                  * to unref the bo:
180                  */
181                 drm_gem_object_put(bo);
182                 ret = PTR_ERR(fb);
183                 goto fail;
184         }
185
186         /* note: this keeps the bo pinned.. which is perhaps not ideal,
187          * but is needed as long as we use fb_mmap() to mmap to userspace
188          * (since this happens using fix.smem_start).  Possibly we could
189          * implement our own mmap using GEM mmap support to avoid this
190          * (non-tiled buffer doesn't need to be pinned for fbcon to write
191          * to it).  Then we just need to be sure that we are able to re-
192          * pin it in case of an opps.
193          */
194         ret = omap_gem_pin(bo, &dma_addr);
195         if (ret) {
196                 dev_err(dev->dev, "could not pin framebuffer\n");
197                 ret = -ENOMEM;
198                 goto fail;
199         }
200
201         fbi = drm_fb_helper_alloc_info(helper);
202         if (IS_ERR(fbi)) {
203                 dev_err(dev->dev, "failed to allocate fb info\n");
204                 ret = PTR_ERR(fbi);
205                 goto fail;
206         }
207
208         DBG("fbi=%p, dev=%p", fbi, dev);
209
210         helper->fb = fb;
211
212         fbi->fbops = &omap_fb_ops;
213
214         drm_fb_helper_fill_info(fbi, helper, sizes);
215
216         fbi->flags |= FBINFO_VIRTFB;
217         fbi->screen_buffer = omap_gem_vaddr(bo);
218         fbi->screen_size = bo->size;
219         fbi->fix.smem_start = dma_addr;
220         fbi->fix.smem_len = bo->size;
221
222         /* deferred I/O */
223         helper->fbdefio.delay = HZ / 20;
224         helper->fbdefio.deferred_io = drm_fb_helper_deferred_io;
225
226         fbi->fbdefio = &helper->fbdefio;
227         ret = fb_deferred_io_init(fbi);
228         if (ret)
229                 goto fail;
230
231         /* if we have DMM, then we can use it for scrolling by just
232          * shuffling pages around in DMM rather than doing sw blit.
233          */
234         if (fbdev->ywrap_enabled) {
235                 DRM_INFO("Enabling DMM ywrap scrolling\n");
236                 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
237                 fbi->fix.ywrapstep = 1;
238         }
239
240
241         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
242         DBG("allocated %dx%d fb", fb->width, fb->height);
243
244         return 0;
245
246 fail:
247
248         if (ret) {
249                 if (fb)
250                         drm_framebuffer_remove(fb);
251         }
252
253         return ret;
254 }
255
256 static int omap_fbdev_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
257 {
258         if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
259                 return 0;
260
261         if (helper->fb->funcs->dirty)
262                 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
263
264         return 0;
265 }
266
267 static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
268         .fb_probe = omap_fbdev_create,
269         .fb_dirty = omap_fbdev_dirty,
270 };
271
272 static struct drm_fb_helper *get_fb(struct fb_info *fbi)
273 {
274         if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
275                 /* these are not the fb's you're looking for */
276                 return NULL;
277         }
278         return fbi->par;
279 }
280
281 /*
282  * struct drm_client
283  */
284
285 static void omap_fbdev_client_unregister(struct drm_client_dev *client)
286 {
287         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
288
289         if (fb_helper->info) {
290                 drm_fb_helper_unregister_info(fb_helper);
291         } else {
292                 drm_client_release(&fb_helper->client);
293                 drm_fb_helper_unprepare(fb_helper);
294                 kfree(fb_helper);
295         }
296 }
297
298 static int omap_fbdev_client_restore(struct drm_client_dev *client)
299 {
300         drm_fb_helper_lastclose(client->dev);
301
302         return 0;
303 }
304
305 static int omap_fbdev_client_hotplug(struct drm_client_dev *client)
306 {
307         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
308         struct drm_device *dev = client->dev;
309         int ret;
310
311         if (dev->fb_helper)
312                 return drm_fb_helper_hotplug_event(dev->fb_helper);
313
314         ret = drm_fb_helper_init(dev, fb_helper);
315         if (ret)
316                 goto err_drm_err;
317
318         ret = drm_fb_helper_initial_config(fb_helper);
319         if (ret)
320                 goto err_drm_fb_helper_fini;
321
322         return 0;
323
324 err_drm_fb_helper_fini:
325         drm_fb_helper_fini(fb_helper);
326 err_drm_err:
327         drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);
328         return ret;
329 }
330
331 static const struct drm_client_funcs omap_fbdev_client_funcs = {
332         .owner          = THIS_MODULE,
333         .unregister     = omap_fbdev_client_unregister,
334         .restore        = omap_fbdev_client_restore,
335         .hotplug        = omap_fbdev_client_hotplug,
336 };
337
338 void omap_fbdev_setup(struct drm_device *dev)
339 {
340         struct omap_drm_private *priv = dev->dev_private;
341         struct omap_fbdev *fbdev;
342         struct drm_fb_helper *helper;
343         int ret;
344
345         drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
346         drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
347
348         fbdev = drmm_kzalloc(dev, sizeof(*fbdev), GFP_KERNEL);
349         if (!fbdev)
350                 return;
351         fbdev->dev = dev;
352         INIT_WORK(&fbdev->work, pan_worker);
353
354         priv->fbdev = fbdev;
355
356         helper = kzalloc(sizeof(*helper), GFP_KERNEL);
357         if (!helper)
358                 return;
359         drm_fb_helper_prepare(dev, helper, 32, &omap_fb_helper_funcs);
360
361         ret = drm_client_init(dev, &helper->client, "fbdev", &omap_fbdev_client_funcs);
362         if (ret)
363                 goto err_drm_client_init;
364
365         drm_client_register(&helper->client);
366
367         return;
368
369 err_drm_client_init:
370         drm_fb_helper_unprepare(helper);
371         kfree(helper);
372 }
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