diff options
Diffstat (limited to 'drivers/gpu/drm/msm/msm_fbdev.c')
| -rw-r--r-- | drivers/gpu/drm/msm/msm_fbdev.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c new file mode 100644 index 0000000000..030bedac63 --- /dev/null +++ b/drivers/gpu/drm/msm/msm_fbdev.c @@ -0,0 +1,256 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2013 Red Hat + * Author: Rob Clark <robdclark@gmail.com> + */ + +#include <linux/fb.h> + +#include <drm/drm_drv.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_framebuffer.h> +#include <drm/drm_prime.h> + +#include "msm_drv.h" +#include "msm_gem.h" +#include "msm_kms.h" + +static bool fbdev = true; +MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer"); +module_param(fbdev, bool, 0600); + +/* + * fbdev funcs, to implement legacy fbdev interface on top of drm driver + */ + +FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev, + drm_fb_helper_damage_range, + drm_fb_helper_damage_area) + +static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; + struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0); + + return drm_gem_prime_mmap(bo, vma); +} + +static void msm_fbdev_fb_destroy(struct fb_info *info) +{ + struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; + struct drm_framebuffer *fb = helper->fb; + struct drm_gem_object *bo = msm_framebuffer_bo(fb, 0); + + DBG(); + + drm_fb_helper_fini(helper); + + /* this will free the backing object */ + msm_gem_put_vaddr(bo); + drm_framebuffer_remove(fb); + + drm_client_release(&helper->client); + drm_fb_helper_unprepare(helper); + kfree(helper); +} + +static const struct fb_ops msm_fb_ops = { + .owner = THIS_MODULE, + __FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev), + DRM_FB_HELPER_DEFAULT_OPS, + __FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev), + .fb_mmap = msm_fbdev_mmap, + .fb_destroy = msm_fbdev_fb_destroy, +}; + +static int msm_fbdev_create(struct drm_fb_helper *helper, + struct drm_fb_helper_surface_size *sizes) +{ + struct drm_device *dev = helper->dev; + struct msm_drm_private *priv = dev->dev_private; + struct drm_framebuffer *fb = NULL; + struct drm_gem_object *bo; + struct fb_info *fbi = NULL; + uint64_t paddr; + uint32_t format; + int ret, pitch; + + format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); + + DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, + sizes->surface_height, sizes->surface_bpp, + sizes->fb_width, sizes->fb_height); + + pitch = align_pitch(sizes->surface_width, sizes->surface_bpp); + fb = msm_alloc_stolen_fb(dev, sizes->surface_width, + sizes->surface_height, pitch, format); + + if (IS_ERR(fb)) { + DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n"); + return PTR_ERR(fb); + } + + bo = msm_framebuffer_bo(fb, 0); + + /* + * NOTE: if we can be guaranteed to be able to map buffer + * in panic (ie. lock-safe, etc) we could avoid pinning the + * buffer now: + */ + ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr); + if (ret) { + DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); + goto fail; + } + + fbi = drm_fb_helper_alloc_info(helper); + if (IS_ERR(fbi)) { + DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); + ret = PTR_ERR(fbi); + goto fail; + } + + DBG("fbi=%p, dev=%p", fbi, dev); + + helper->fb = fb; + + fbi->fbops = &msm_fb_ops; + + drm_fb_helper_fill_info(fbi, helper, sizes); + + fbi->screen_buffer = msm_gem_get_vaddr(bo); + if (IS_ERR(fbi->screen_buffer)) { + ret = PTR_ERR(fbi->screen_buffer); + goto fail; + } + fbi->screen_size = bo->size; + fbi->fix.smem_start = paddr; + fbi->fix.smem_len = bo->size; + + DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); + DBG("allocated %dx%d fb", fb->width, fb->height); + + return 0; + +fail: + drm_framebuffer_remove(fb); + return ret; +} + +static int msm_fbdev_fb_dirty(struct drm_fb_helper *helper, + struct drm_clip_rect *clip) +{ + struct drm_device *dev = helper->dev; + int ret; + + /* Call damage handlers only if necessary */ + if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2)) + return 0; + + if (helper->fb->funcs->dirty) { + ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1); + if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret)) + return ret; + } + + return 0; +} + +static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { + .fb_probe = msm_fbdev_create, + .fb_dirty = msm_fbdev_fb_dirty, +}; + +/* + * struct drm_client + */ + +static void msm_fbdev_client_unregister(struct drm_client_dev *client) +{ + struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); + + if (fb_helper->info) { + drm_fb_helper_unregister_info(fb_helper); + } else { + drm_client_release(&fb_helper->client); + drm_fb_helper_unprepare(fb_helper); + kfree(fb_helper); + } +} + +static int msm_fbdev_client_restore(struct drm_client_dev *client) +{ + drm_fb_helper_lastclose(client->dev); + + return 0; +} + +static int msm_fbdev_client_hotplug(struct drm_client_dev *client) +{ + struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); + struct drm_device *dev = client->dev; + int ret; + + if (dev->fb_helper) + return drm_fb_helper_hotplug_event(dev->fb_helper); + + ret = drm_fb_helper_init(dev, fb_helper); + if (ret) + goto err_drm_err; + + if (!drm_drv_uses_atomic_modeset(dev)) + drm_helper_disable_unused_functions(dev); + + ret = drm_fb_helper_initial_config(fb_helper); + if (ret) + goto err_drm_fb_helper_fini; + + return 0; + +err_drm_fb_helper_fini: + drm_fb_helper_fini(fb_helper); +err_drm_err: + drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret); + return ret; +} + +static const struct drm_client_funcs msm_fbdev_client_funcs = { + .owner = THIS_MODULE, + .unregister = msm_fbdev_client_unregister, + .restore = msm_fbdev_client_restore, + .hotplug = msm_fbdev_client_hotplug, +}; + +/* initialize fbdev helper */ +void msm_fbdev_setup(struct drm_device *dev) +{ + struct drm_fb_helper *helper; + int ret; + + if (!fbdev) + return; + + drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); + drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); + + helper = kzalloc(sizeof(*helper), GFP_KERNEL); + if (!helper) + return; + drm_fb_helper_prepare(dev, helper, 32, &msm_fb_helper_funcs); + + ret = drm_client_init(dev, &helper->client, "fbdev", &msm_fbdev_client_funcs); + if (ret) { + drm_err(dev, "Failed to register client: %d\n", ret); + goto err_drm_fb_helper_unprepare; + } + + drm_client_register(&helper->client); + + return; + +err_drm_fb_helper_unprepare: + drm_fb_helper_unprepare(helper); + kfree(helper); +} |