Merge "disp: msm: add msm framebuffer emulation"
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msm/msm_fbdev.c
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216
msm/msm_fbdev.c
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2013 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*/
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#include <drm/drm_crtc.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_fourcc.h>
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#include "msm_drv.h"
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#include "msm_kms.h"
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extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
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struct vm_area_struct *vma);
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static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
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/*
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* fbdev funcs, to implement legacy fbdev interface on top of drm driver
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*/
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#define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
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struct msm_fbdev {
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struct drm_fb_helper base;
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struct drm_framebuffer *fb;
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};
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static struct fb_ops msm_fb_ops = {
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.owner = THIS_MODULE,
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DRM_FB_HELPER_DEFAULT_OPS,
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/* Note: to properly handle manual update displays, we wrap the
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* basic fbdev ops which write to the framebuffer
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*/
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.fb_read = drm_fb_helper_sys_read,
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.fb_write = drm_fb_helper_sys_write,
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.fb_fillrect = drm_fb_helper_sys_fillrect,
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.fb_copyarea = drm_fb_helper_sys_copyarea,
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.fb_imageblit = drm_fb_helper_sys_imageblit,
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.fb_mmap = msm_fbdev_mmap,
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};
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static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
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{
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struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
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struct msm_fbdev *fbdev = to_msm_fbdev(helper);
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struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
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int ret = 0;
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ret = drm_gem_mmap_obj(bo, bo->size, vma);
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if (ret) {
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pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
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return ret;
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}
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return msm_gem_mmap_obj(bo, vma);
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}
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static int msm_fbdev_create(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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struct msm_fbdev *fbdev = to_msm_fbdev(helper);
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struct drm_device *dev = helper->dev;
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struct msm_drm_private *priv = dev->dev_private;
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struct drm_framebuffer *fb = NULL;
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struct drm_gem_object *bo;
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struct fb_info *fbi = NULL;
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uint64_t paddr;
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uint32_t format;
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int ret, pitch;
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format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
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DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
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sizes->surface_height, sizes->surface_bpp,
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sizes->fb_width, sizes->fb_height);
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pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
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fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
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sizes->surface_height, pitch, format);
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if (IS_ERR(fb)) {
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DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
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return PTR_ERR(fb);
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}
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bo = msm_framebuffer_bo(fb, 0);
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mutex_lock(&dev->struct_mutex);
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/*
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* NOTE: if we can be guaranteed to be able to map buffer
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* in panic (ie. lock-safe, etc) we could avoid pinning the
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* buffer now:
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*/
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ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
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if (ret) {
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DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
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goto fail_unlock;
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}
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fbi = drm_fb_helper_alloc_fbi(helper);
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if (IS_ERR(fbi)) {
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DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
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ret = PTR_ERR(fbi);
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goto fail_unlock;
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}
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DBG("fbi=%pK, dev=%pK", fbi, dev);
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fbdev->fb = fb;
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helper->fb = fb;
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fbi->fbops = &msm_fb_ops;
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drm_fb_helper_fill_info(fbi, helper, sizes);
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dev->mode_config.fb_base = paddr;
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fbi->screen_base = msm_gem_get_vaddr(bo);
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if (IS_ERR(fbi->screen_base)) {
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ret = PTR_ERR(fbi->screen_base);
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goto fail_unlock;
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}
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fbi->screen_size = bo->size;
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fbi->fix.smem_start = paddr;
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fbi->fix.smem_len = bo->size;
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DBG("par=%pK, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
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DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
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mutex_unlock(&dev->struct_mutex);
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return 0;
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fail_unlock:
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mutex_unlock(&dev->struct_mutex);
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drm_framebuffer_remove(fb);
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return ret;
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}
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static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
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.fb_probe = msm_fbdev_create,
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};
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/* initialize fbdev helper */
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struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
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{
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struct msm_drm_private *priv = dev->dev_private;
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struct msm_fbdev *fbdev = NULL;
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struct drm_fb_helper *helper;
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int ret;
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fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
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if (!fbdev)
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goto fail;
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helper = &fbdev->base;
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drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
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ret = drm_fb_helper_init(dev, helper, priv->num_connectors);
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if (ret) {
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DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
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goto fail;
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}
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ret = drm_fb_helper_single_add_all_connectors(helper);
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if (ret)
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goto fini;
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/* the fw fb could be anywhere in memory */
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drm_fb_helper_remove_conflicting_framebuffers(NULL, "msm", false);
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ret = drm_fb_helper_initial_config(helper, 32);
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if (ret)
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goto fini;
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priv->fbdev = helper;
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return helper;
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fini:
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drm_fb_helper_fini(helper);
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fail:
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kfree(fbdev);
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return NULL;
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}
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void msm_fbdev_free(struct drm_device *dev)
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{
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struct msm_drm_private *priv = dev->dev_private;
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struct drm_fb_helper *helper = priv->fbdev;
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struct msm_fbdev *fbdev;
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DBG();
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drm_fb_helper_unregister_fbi(helper);
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drm_fb_helper_fini(helper);
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fbdev = to_msm_fbdev(priv->fbdev);
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/* this will free the backing object */
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if (fbdev->fb) {
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struct drm_gem_object *bo =
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msm_framebuffer_bo(fbdev->fb, 0);
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msm_gem_put_vaddr(bo);
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drm_framebuffer_remove(fbdev->fb);
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}
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kfree(fbdev);
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priv->fbdev = NULL;
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}
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