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 28 FB_GEN_DEFAULT_DEFERRED_SYS_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 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 drm_fb_helper_unprepare(helper); 56 kfree(helper); 57 } 58 59 static const struct fb_ops msm_fb_ops = { 60 .owner = THIS_MODULE, 61 __FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev), 62 DRM_FB_HELPER_DEFAULT_OPS, 63 __FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev), 64 .fb_mmap = msm_fbdev_mmap, 65 .fb_destroy = msm_fbdev_fb_destroy, 66 }; 67 68 static int msm_fbdev_create(struct drm_fb_helper *helper, 69 struct drm_fb_helper_surface_size *sizes) 70 { 71 struct drm_device *dev = helper->dev; 72 struct msm_drm_private *priv = dev->dev_private; 73 struct drm_framebuffer *fb = NULL; 74 struct drm_gem_object *bo; 75 struct fb_info *fbi = NULL; 76 uint64_t paddr; 77 uint32_t format; 78 int ret, pitch; 79 80 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); 81 82 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 83 sizes->surface_height, sizes->surface_bpp, 84 sizes->fb_width, sizes->fb_height); 85 86 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp); 87 fb = msm_alloc_stolen_fb(dev, sizes->surface_width, 88 sizes->surface_height, pitch, format); 89 90 if (IS_ERR(fb)) { 91 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n"); 92 return PTR_ERR(fb); 93 } 94 95 bo = msm_framebuffer_bo(fb, 0); 96 97 /* 98 * NOTE: if we can be guaranteed to be able to map buffer 99 * in panic (ie. lock-safe, etc) we could avoid pinning the 100 * buffer now: 101 */ 102 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr); 103 if (ret) { 104 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); 105 goto fail; 106 } 107 108 fbi = drm_fb_helper_alloc_info(helper); 109 if (IS_ERR(fbi)) { 110 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); 111 ret = PTR_ERR(fbi); 112 goto fail; 113 } 114 115 DBG("fbi=%p, dev=%p", fbi, dev); 116 117 helper->fb = fb; 118 119 fbi->fbops = &msm_fb_ops; 120 121 drm_fb_helper_fill_info(fbi, helper, sizes); 122 123 fbi->screen_buffer = msm_gem_get_vaddr(bo); 124 if (IS_ERR(fbi->screen_buffer)) { 125 ret = PTR_ERR(fbi->screen_buffer); 126 goto fail; 127 } 128 fbi->screen_size = bo->size; 129 fbi->fix.smem_start = paddr; 130 fbi->fix.smem_len = bo->size; 131 132 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 133 DBG("allocated %dx%d fb", fb->width, fb->height); 134 135 return 0; 136 137 fail: 138 drm_framebuffer_remove(fb); 139 return ret; 140 } 141 142 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 143 .fb_probe = msm_fbdev_create, 144 }; 145 146 /* 147 * struct drm_client 148 */ 149 150 static void msm_fbdev_client_unregister(struct drm_client_dev *client) 151 { 152 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 153 154 if (fb_helper->info) { 155 drm_fb_helper_unregister_info(fb_helper); 156 } else { 157 drm_client_release(&fb_helper->client); 158 drm_fb_helper_unprepare(fb_helper); 159 kfree(fb_helper); 160 } 161 } 162 163 static int msm_fbdev_client_restore(struct drm_client_dev *client) 164 { 165 drm_fb_helper_lastclose(client->dev); 166 167 return 0; 168 } 169 170 static int msm_fbdev_client_hotplug(struct drm_client_dev *client) 171 { 172 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 173 struct drm_device *dev = client->dev; 174 int ret; 175 176 if (dev->fb_helper) 177 return drm_fb_helper_hotplug_event(dev->fb_helper); 178 179 ret = drm_fb_helper_init(dev, fb_helper); 180 if (ret) 181 goto err_drm_err; 182 183 if (!drm_drv_uses_atomic_modeset(dev)) 184 drm_helper_disable_unused_functions(dev); 185 186 ret = drm_fb_helper_initial_config(fb_helper); 187 if (ret) 188 goto err_drm_fb_helper_fini; 189 190 return 0; 191 192 err_drm_fb_helper_fini: 193 drm_fb_helper_fini(fb_helper); 194 err_drm_err: 195 drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret); 196 return ret; 197 } 198 199 static const struct drm_client_funcs msm_fbdev_client_funcs = { 200 .owner = THIS_MODULE, 201 .unregister = msm_fbdev_client_unregister, 202 .restore = msm_fbdev_client_restore, 203 .hotplug = msm_fbdev_client_hotplug, 204 }; 205 206 /* initialize fbdev helper */ 207 void msm_fbdev_setup(struct drm_device *dev) 208 { 209 struct drm_fb_helper *helper; 210 int ret; 211 212 if (!fbdev) 213 return; 214 215 drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); 216 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); 217 218 helper = kzalloc(sizeof(*helper), GFP_KERNEL); 219 if (!helper) 220 return; 221 drm_fb_helper_prepare(dev, helper, 32, &msm_fb_helper_funcs); 222 223 ret = drm_client_init(dev, &helper->client, "fbdev", &msm_fbdev_client_funcs); 224 if (ret) { 225 drm_err(dev, "Failed to register client: %d\n", ret); 226 goto err_drm_fb_helper_unprepare; 227 } 228 229 ret = msm_fbdev_client_hotplug(&helper->client); 230 if (ret) 231 drm_dbg_kms(dev, "client hotplug ret=%d\n", ret); 232 233 drm_client_register(&helper->client); 234 235 return; 236 237 err_drm_fb_helper_unprepare: 238 drm_fb_helper_unprepare(helper); 239 kfree(helper); 240 } 241