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_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 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_fb_dirty(struct drm_fb_helper *helper, 69 struct drm_clip_rect *clip) 70 { 71 struct drm_device *dev = helper->dev; 72 int ret; 73 74 /* Call damage handlers only if necessary */ 75 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2)) 76 return 0; 77 78 if (helper->fb->funcs->dirty) { 79 ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1); 80 if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret)) 81 return ret; 82 } 83 84 return 0; 85 } 86 87 static const struct drm_fb_helper_funcs msm_fbdev_helper_funcs = { 88 .fb_dirty = msm_fbdev_fb_dirty, 89 }; 90 91 int msm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper, 92 struct drm_fb_helper_surface_size *sizes) 93 { 94 struct drm_device *dev = helper->dev; 95 struct msm_drm_private *priv = dev->dev_private; 96 struct drm_framebuffer *fb = NULL; 97 struct drm_gem_object *bo; 98 struct fb_info *fbi = NULL; 99 uint64_t paddr; 100 uint32_t format; 101 int ret, pitch; 102 103 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); 104 105 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 106 sizes->surface_height, sizes->surface_bpp, 107 sizes->fb_width, sizes->fb_height); 108 109 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp); 110 fb = msm_alloc_stolen_fb(dev, sizes->surface_width, 111 sizes->surface_height, pitch, format); 112 113 if (IS_ERR(fb)) { 114 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n"); 115 return PTR_ERR(fb); 116 } 117 118 bo = msm_framebuffer_bo(fb, 0); 119 120 /* 121 * NOTE: if we can be guaranteed to be able to map buffer 122 * in panic (ie. lock-safe, etc) we could avoid pinning the 123 * buffer now: 124 */ 125 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr); 126 if (ret) { 127 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); 128 goto fail; 129 } 130 131 fbi = drm_fb_helper_alloc_info(helper); 132 if (IS_ERR(fbi)) { 133 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); 134 ret = PTR_ERR(fbi); 135 goto fail; 136 } 137 138 DBG("fbi=%p, dev=%p", fbi, dev); 139 140 helper->funcs = &msm_fbdev_helper_funcs; 141 helper->fb = fb; 142 143 fbi->fbops = &msm_fb_ops; 144 145 drm_fb_helper_fill_info(fbi, helper, sizes); 146 147 fbi->screen_buffer = msm_gem_get_vaddr(bo); 148 if (IS_ERR(fbi->screen_buffer)) { 149 ret = PTR_ERR(fbi->screen_buffer); 150 goto fail; 151 } 152 fbi->screen_size = bo->size; 153 fbi->fix.smem_start = paddr; 154 fbi->fix.smem_len = bo->size; 155 156 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 157 DBG("allocated %dx%d fb", fb->width, fb->height); 158 159 return 0; 160 161 fail: 162 drm_framebuffer_remove(fb); 163 return ret; 164 } 165