1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2013 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
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_fourcc.h>
13 #include <drm/drm_framebuffer.h>
14 #include <drm/drm_prime.h>
15
16 #include "msm_drv.h"
17 #include "msm_gem.h"
18 #include "msm_kms.h"
19
20 static bool fbdev = true;
21 MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
22 module_param(fbdev, bool, 0600);
23
24 /*
25 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
26 */
27
FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev,drm_fb_helper_damage_range,drm_fb_helper_damage_area)28 FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev,
29 drm_fb_helper_damage_range,
30 drm_fb_helper_damage_area)
31
32 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
33 {
34 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
35 struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0);
36
37 return drm_gem_prime_mmap(bo, vma);
38 }
39
msm_fbdev_fb_destroy(struct fb_info * info)40 static void msm_fbdev_fb_destroy(struct fb_info *info)
41 {
42 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
43 struct drm_framebuffer *fb = helper->fb;
44 struct drm_gem_object *bo = msm_framebuffer_bo(fb, 0);
45
46 DBG();
47
48 drm_fb_helper_fini(helper);
49
50 /* this will free the backing object */
51 msm_gem_put_vaddr(bo);
52 drm_framebuffer_remove(fb);
53
54 drm_client_release(&helper->client);
55 }
56
57 static const struct fb_ops msm_fb_ops = {
58 .owner = THIS_MODULE,
59 __FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev),
60 DRM_FB_HELPER_DEFAULT_OPS,
61 __FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev),
62 .fb_mmap = msm_fbdev_mmap,
63 .fb_destroy = msm_fbdev_fb_destroy,
64 };
65
msm_fbdev_fb_dirty(struct drm_fb_helper * helper,struct drm_clip_rect * clip)66 static int msm_fbdev_fb_dirty(struct drm_fb_helper *helper,
67 struct drm_clip_rect *clip)
68 {
69 struct drm_device *dev = helper->dev;
70 int ret;
71
72 /* Call damage handlers only if necessary */
73 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
74 return 0;
75
76 if (helper->fb->funcs->dirty) {
77 ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
78 if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
79 return ret;
80 }
81
82 return 0;
83 }
84
85 static const struct drm_fb_helper_funcs msm_fbdev_helper_funcs = {
86 .fb_dirty = msm_fbdev_fb_dirty,
87 };
88
msm_fbdev_driver_fbdev_probe(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)89 int msm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
90 struct drm_fb_helper_surface_size *sizes)
91 {
92 struct drm_device *dev = helper->dev;
93 struct msm_drm_private *priv = dev->dev_private;
94 struct fb_info *fbi = helper->info;
95 struct drm_framebuffer *fb = NULL;
96 struct drm_gem_object *bo;
97 uint64_t paddr;
98 uint32_t format;
99 int ret, pitch;
100
101 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
102
103 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
104 sizes->surface_height, sizes->surface_bpp,
105 sizes->fb_width, sizes->fb_height);
106
107 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
108 fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
109 sizes->surface_height, pitch, format);
110
111 if (IS_ERR(fb)) {
112 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
113 return PTR_ERR(fb);
114 }
115
116 bo = msm_framebuffer_bo(fb, 0);
117
118 /*
119 * NOTE: if we can be guaranteed to be able to map buffer
120 * in panic (ie. lock-safe, etc) we could avoid pinning the
121 * buffer now:
122 */
123 ret = msm_gem_get_and_pin_iova(bo, priv->kms->vm, &paddr);
124 if (ret) {
125 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
126 goto fail;
127 }
128
129 DBG("fbi=%p, dev=%p", fbi, dev);
130
131 helper->funcs = &msm_fbdev_helper_funcs;
132 helper->fb = fb;
133
134 fbi->fbops = &msm_fb_ops;
135
136 drm_fb_helper_fill_info(fbi, helper, sizes);
137
138 fbi->screen_buffer = msm_gem_get_vaddr(bo);
139 if (IS_ERR(fbi->screen_buffer)) {
140 ret = PTR_ERR(fbi->screen_buffer);
141 goto fail;
142 }
143 fbi->screen_size = bo->size;
144 fbi->fix.smem_start = paddr;
145 fbi->fix.smem_len = bo->size;
146
147 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
148 DBG("allocated %dx%d fb", fb->width, fb->height);
149
150 return 0;
151
152 fail:
153 drm_framebuffer_remove(fb);
154 return ret;
155 }
156