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// 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);
}
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