kvj
/
linux-zen-server
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
linux-zen-server/drivers/gpu/drm/drm_fb_helper.c

2344 lines
66 KiB
C
Raw Permalink Normal View History

Initial commit
2023-08-30 17:53:23 +02:00
/*
* Copyright (c) 2006-2009 Red Hat Inc.
* Copyright (c) 2006-2008 Intel Corporation
* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
*
* DRM framebuffer helper functions
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*
* Authors:
* Dave Airlie <airlied@linux.ie>
* Jesse Barnes <jesse.barnes@intel.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/sysrq.h>
#include <linux/vga_switcheroo.h>
#include <drm/drm_atomic.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_print.h>
#include <drm/drm_vblank.h>
#include "drm_internal.h"
static bool drm_fbdev_emulation = true;
module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
MODULE_PARM_DESC(fbdev_emulation,
"Enable legacy fbdev emulation [default=true]");
static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
module_param(drm_fbdev_overalloc, int, 0444);
MODULE_PARM_DESC(drm_fbdev_overalloc,
"Overallocation of the fbdev buffer (%) [default="
__MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
/*
* In order to keep user-space compatibility, we want in certain use-cases
* to keep leaking the fbdev physical address to the user-space program
* handling the fbdev buffer.
* This is a bad habit essentially kept into closed source opengl driver
* that should really be moved into open-source upstream projects instead
* of using legacy physical addresses in user space to communicate with
* other out-of-tree kernel modules.
*
* This module_param *should* be removed as soon as possible and be
* considered as a broken and legacy behaviour from a modern fbdev device.
*/
#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
static bool drm_leak_fbdev_smem;
module_param_unsafe(drm_leak_fbdev_smem, bool, 0600);
MODULE_PARM_DESC(drm_leak_fbdev_smem,
"Allow unsafe leaking fbdev physical smem address [default=false]");
#endif
static LIST_HEAD(kernel_fb_helper_list);
static DEFINE_MUTEX(kernel_fb_helper_lock);
/**
* DOC: fbdev helpers
*
* The fb helper functions are useful to provide an fbdev on top of a drm kernel
* mode setting driver. They can be used mostly independently from the crtc
* helper functions used by many drivers to implement the kernel mode setting
* interfaces.
*
* Drivers that support a dumb buffer with a virtual address and mmap support,
* should try out the generic fbdev emulation using drm_fbdev_generic_setup().
* It will automatically set up deferred I/O if the driver requires a shadow
* buffer.
*
* Existing fbdev implementations should restore the fbdev console by using
* drm_fb_helper_lastclose() as their &drm_driver.lastclose callback.
* They should also notify the fb helper code from updates to the output
* configuration by using drm_fb_helper_output_poll_changed() as their
* &drm_mode_config_funcs.output_poll_changed callback. New implementations
* of fbdev should be build on top of struct &drm_client_funcs, which handles
* this automatically. Setting the old callbacks should be avoided.
*
* For suspend/resume consider using drm_mode_config_helper_suspend() and
* drm_mode_config_helper_resume() which takes care of fbdev as well.
*
* All other functions exported by the fb helper library can be used to
* implement the fbdev driver interface by the driver.
*
* It is possible, though perhaps somewhat tricky, to implement race-free
* hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
* helper must be called first to initialize the minimum required to make
* hotplug detection work. Drivers also need to make sure to properly set up
* the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
* it is safe to enable interrupts and start processing hotplug events. At the
* same time, drivers should initialize all modeset objects such as CRTCs,
* encoders and connectors. To finish up the fbdev helper initialization, the
* drm_fb_helper_init() function is called. To probe for all attached displays
* and set up an initial configuration using the detected hardware, drivers
* should call drm_fb_helper_initial_config().
*
* If &drm_framebuffer_funcs.dirty is set, the
* drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
* accumulate changes and schedule &drm_fb_helper.dirty_work to run right
* away. This worker then calls the dirty() function ensuring that it will
* always run in process context since the fb_*() function could be running in
* atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
* callback it will also schedule dirty_work with the damage collected from the
* mmap page writes.
*
* Deferred I/O is not compatible with SHMEM. Such drivers should request an
* fbdev shadow buffer and call drm_fbdev_generic_setup() instead.
*/
static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
{
uint16_t *r_base, *g_base, *b_base;
if (crtc->funcs->gamma_set == NULL)
return;
r_base = crtc->gamma_store;
g_base = r_base + crtc->gamma_size;
b_base = g_base + crtc->gamma_size;
crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
crtc->gamma_size, NULL);
}
/**
* drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
* @info: fbdev registered by the helper
*/
int drm_fb_helper_debug_enter(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
const struct drm_crtc_helper_funcs *funcs;
struct drm_mode_set *mode_set;
list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
mutex_lock(&helper->client.modeset_mutex);
drm_client_for_each_modeset(mode_set, &helper->client) {
if (!mode_set->crtc->enabled)
continue;
funcs = mode_set->crtc->helper_private;
if (funcs->mode_set_base_atomic == NULL)
continue;
if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
continue;
funcs->mode_set_base_atomic(mode_set->crtc,
mode_set->fb,
mode_set->x,
mode_set->y,
ENTER_ATOMIC_MODE_SET);
}
mutex_unlock(&helper->client.modeset_mutex);
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_debug_enter);
/**
* drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
* @info: fbdev registered by the helper
*/
int drm_fb_helper_debug_leave(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
struct drm_client_dev *client = &helper->client;
struct drm_device *dev = helper->dev;
struct drm_crtc *crtc;
const struct drm_crtc_helper_funcs *funcs;
struct drm_mode_set *mode_set;
struct drm_framebuffer *fb;
mutex_lock(&client->modeset_mutex);
drm_client_for_each_modeset(mode_set, client) {
crtc = mode_set->crtc;
if (drm_drv_uses_atomic_modeset(crtc->dev))
continue;
funcs = crtc->helper_private;
fb = crtc->primary->fb;
if (!crtc->enabled)
continue;
if (!fb) {
drm_err(dev, "no fb to restore?\n");
continue;
}
if (funcs->mode_set_base_atomic == NULL)
continue;
drm_fb_helper_restore_lut_atomic(mode_set->crtc);
funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
crtc->y, LEAVE_ATOMIC_MODE_SET);
}
mutex_unlock(&client->modeset_mutex);
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_debug_leave);
static int
__drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper,
bool force)
{
bool do_delayed;
int ret;
if (!drm_fbdev_emulation || !fb_helper)
return -ENODEV;
if (READ_ONCE(fb_helper->deferred_setup))
return 0;
mutex_lock(&fb_helper->lock);
if (force) {
/*
* Yes this is the _locked version which expects the master lock
* to be held. But for forced restores we're intentionally
* racing here, see drm_fb_helper_set_par().
*/
ret = drm_client_modeset_commit_locked(&fb_helper->client);
} else {
ret = drm_client_modeset_commit(&fb_helper->client);
}
do_delayed = fb_helper->delayed_hotplug;
if (do_delayed)
fb_helper->delayed_hotplug = false;
mutex_unlock(&fb_helper->lock);
if (do_delayed)
drm_fb_helper_hotplug_event(fb_helper);
return ret;
}
/**
* drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
* @fb_helper: driver-allocated fbdev helper, can be NULL
*
* This should be called from driver's drm &drm_driver.lastclose callback
* when implementing an fbcon on top of kms using this helper. This ensures that
* the user isn't greeted with a black screen when e.g. X dies.
*
* RETURNS:
* Zero if everything went ok, negative error code otherwise.
*/
int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
{
return __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, false);
}
EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
#ifdef CONFIG_MAGIC_SYSRQ
/* emergency restore, don't bother with error reporting */
static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
{
struct drm_fb_helper *helper;
mutex_lock(&kernel_fb_helper_lock);
list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
struct drm_device *dev = helper->dev;
if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
continue;
mutex_lock(&helper->lock);
drm_client_modeset_commit_locked(&helper->client);
mutex_unlock(&helper->lock);
}
mutex_unlock(&kernel_fb_helper_lock);
}
static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
static void drm_fb_helper_sysrq(int dummy1)
{
schedule_work(&drm_fb_helper_restore_work);
}
static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
.handler = drm_fb_helper_sysrq,
.help_msg = "force-fb(v)",
.action_msg = "Restore framebuffer console",
};
#else
static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
#endif
static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
{
struct drm_fb_helper *fb_helper = info->par;
mutex_lock(&fb_helper->lock);
drm_client_modeset_dpms(&fb_helper->client, dpms_mode);
mutex_unlock(&fb_helper->lock);
}
/**
* drm_fb_helper_blank - implementation for &fb_ops.fb_blank
* @blank: desired blanking state
* @info: fbdev registered by the helper
*/
int drm_fb_helper_blank(int blank, struct fb_info *info)
{
if (oops_in_progress)
return -EBUSY;
switch (blank) {
/* Display: On; HSync: On, VSync: On */
case FB_BLANK_UNBLANK:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
break;
/* Display: Off; HSync: On, VSync: On */
case FB_BLANK_NORMAL:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
break;
/* Display: Off; HSync: Off, VSync: On */
case FB_BLANK_HSYNC_SUSPEND:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
break;
/* Display: Off; HSync: On, VSync: Off */
case FB_BLANK_VSYNC_SUSPEND:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
break;
/* Display: Off; HSync: Off, VSync: Off */
case FB_BLANK_POWERDOWN:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
break;
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_blank);
static void drm_fb_helper_resume_worker(struct work_struct *work)
{
struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
resume_work);
console_lock();
fb_set_suspend(helper->info, 0);
console_unlock();
}
static void drm_fb_helper_fb_dirty(struct drm_fb_helper *helper)
{
struct drm_device *dev = helper->dev;
struct drm_clip_rect *clip = &helper->damage_clip;
struct drm_clip_rect clip_copy;
unsigned long flags;
int ret;
if (drm_WARN_ON_ONCE(dev, !helper->funcs->fb_dirty))
return;
spin_lock_irqsave(&helper->damage_lock, flags);
clip_copy = *clip;
clip->x1 = clip->y1 = ~0;
clip->x2 = clip->y2 = 0;
spin_unlock_irqrestore(&helper->damage_lock, flags);
ret = helper->funcs->fb_dirty(helper, &clip_copy);
if (ret)
goto err;
return;
err:
/*
* Restore damage clip rectangle on errors. The next run
* of the damage worker will perform the update.
*/
spin_lock_irqsave(&helper->damage_lock, flags);
clip->x1 = min_t(u32, clip->x1, clip_copy.x1);
clip->y1 = min_t(u32, clip->y1, clip_copy.y1);
clip->x2 = max_t(u32, clip->x2, clip_copy.x2);
clip->y2 = max_t(u32, clip->y2, clip_copy.y2);
spin_unlock_irqrestore(&helper->damage_lock, flags);
}
static void drm_fb_helper_damage_work(struct work_struct *work)
{
struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, damage_work);
drm_fb_helper_fb_dirty(helper);
}
/**
* drm_fb_helper_prepare - setup a drm_fb_helper structure
* @dev: DRM device
* @helper: driver-allocated fbdev helper structure to set up
* @preferred_bpp: Preferred bits per pixel for the device.
* @funcs: pointer to structure of functions associate with this helper
*
* Sets up the bare minimum to make the framebuffer helper usable. This is
* useful to implement race-free initialization of the polling helpers.
*/
void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
unsigned int preferred_bpp,
const struct drm_fb_helper_funcs *funcs)
{
/*
* Pick a preferred bpp of 32 if no value has been given. This
* will select XRGB8888 for the framebuffer formats. All drivers
* have to support XRGB8888 for backwards compatibility with legacy
* userspace, so it's the safe choice here.
*
* TODO: Replace struct drm_mode_config.preferred_depth and this
* bpp value with a preferred format that is given as struct
* drm_format_info. Then derive all other values from the
* format.
*/
if (!preferred_bpp)
preferred_bpp = 32;
INIT_LIST_HEAD(&helper->kernel_fb_list);
spin_lock_init(&helper->damage_lock);
INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
INIT_WORK(&helper->damage_work, drm_fb_helper_damage_work);
helper->damage_clip.x1 = helper->damage_clip.y1 = ~0;
mutex_init(&helper->lock);
helper->funcs = funcs;
helper->dev = dev;
helper->preferred_bpp = preferred_bpp;
}
EXPORT_SYMBOL(drm_fb_helper_prepare);
/**
* drm_fb_helper_unprepare - clean up a drm_fb_helper structure
* @fb_helper: driver-allocated fbdev helper structure to set up
*
* Cleans up the framebuffer helper. Inverse of drm_fb_helper_prepare().
*/
void drm_fb_helper_unprepare(struct drm_fb_helper *fb_helper)
{
mutex_destroy(&fb_helper->lock);
}
EXPORT_SYMBOL(drm_fb_helper_unprepare);
/**
* drm_fb_helper_init - initialize a &struct drm_fb_helper
* @dev: drm device
* @fb_helper: driver-allocated fbdev helper structure to initialize
*
* This allocates the structures for the fbdev helper with the given limits.
* Note that this won't yet touch the hardware (through the driver interfaces)
* nor register the fbdev. This is only done in drm_fb_helper_initial_config()
* to allow driver writes more control over the exact init sequence.
*
* Drivers must call drm_fb_helper_prepare() before calling this function.
*
* RETURNS:
* Zero if everything went ok, nonzero otherwise.
*/
int drm_fb_helper_init(struct drm_device *dev,
struct drm_fb_helper *fb_helper)
{
int ret;
/*
* If this is not the generic fbdev client, initialize a drm_client
* without callbacks so we can use the modesets.
*/
if (!fb_helper->client.funcs) {
ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL);
if (ret)
return ret;
}
dev->fb_helper = fb_helper;
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_init);
/**
* drm_fb_helper_alloc_info - allocate fb_info and some of its members
* @fb_helper: driver-allocated fbdev helper
*
* A helper to alloc fb_info and the member cmap. Called by the driver
* within the fb_probe fb_helper callback function. Drivers do not
* need to release the allocated fb_info structure themselves, this is
* automatically done when calling drm_fb_helper_fini().
*
* RETURNS:
* fb_info pointer if things went okay, pointer containing error code
* otherwise
*/
struct fb_info *drm_fb_helper_alloc_info(struct drm_fb_helper *fb_helper)
{
struct device *dev = fb_helper->dev->dev;
struct fb_info *info;
int ret;
info = framebuffer_alloc(0, dev);
if (!info)
return ERR_PTR(-ENOMEM);
ret = fb_alloc_cmap(&info->cmap, 256, 0);
if (ret)
goto err_release;
fb_helper->info = info;
info->skip_vt_switch = true;
return info;
err_release:
framebuffer_release(info);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(drm_fb_helper_alloc_info);
/**
* drm_fb_helper_unregister_info - unregister fb_info framebuffer device
* @fb_helper: driver-allocated fbdev helper, can be NULL
*
* A wrapper around unregister_framebuffer, to release the fb_info
* framebuffer device. This must be called before releasing all resources for
* @fb_helper by calling drm_fb_helper_fini().
*/
void drm_fb_helper_unregister_info(struct drm_fb_helper *fb_helper)
{
if (fb_helper && fb_helper->info)
unregister_framebuffer(fb_helper->info);
}
EXPORT_SYMBOL(drm_fb_helper_unregister_info);
/**
* drm_fb_helper_fini - finialize a &struct drm_fb_helper
* @fb_helper: driver-allocated fbdev helper, can be NULL
*
* This cleans up all remaining resources associated with @fb_helper.
*/
void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
{
struct fb_info *info;
if (!fb_helper)
return;
fb_helper->dev->fb_helper = NULL;
if (!drm_fbdev_emulation)
return;
cancel_work_sync(&fb_helper->resume_work);
cancel_work_sync(&fb_helper->damage_work);
info = fb_helper->info;
if (info) {
if (info->cmap.len)
fb_dealloc_cmap(&info->cmap);
framebuffer_release(info);
}
fb_helper->info = NULL;
mutex_lock(&kernel_fb_helper_lock);
if (!list_empty(&fb_helper->kernel_fb_list)) {
list_del(&fb_helper->kernel_fb_list);
if (list_empty(&kernel_fb_helper_list))
unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
}
mutex_unlock(&kernel_fb_helper_lock);
if (!fb_helper->client.funcs)
drm_client_release(&fb_helper->client);
}
EXPORT_SYMBOL(drm_fb_helper_fini);
static void drm_fb_helper_add_damage_clip(struct drm_fb_helper *helper, u32 x, u32 y,
u32 width, u32 height)
{
struct drm_clip_rect *clip = &helper->damage_clip;
unsigned long flags;
spin_lock_irqsave(&helper->damage_lock, flags);
clip->x1 = min_t(u32, clip->x1, x);
clip->y1 = min_t(u32, clip->y1, y);
clip->x2 = max_t(u32, clip->x2, x + width);
clip->y2 = max_t(u32, clip->y2, y + height);
spin_unlock_irqrestore(&helper->damage_lock, flags);
}
static void drm_fb_helper_damage(struct drm_fb_helper *helper, u32 x, u32 y,
u32 width, u32 height)
{
drm_fb_helper_add_damage_clip(helper, x, y, width, height);
schedule_work(&helper->damage_work);
}
/*
* Convert memory region into area of scanlines and pixels per
* scanline. The parameters off and len must not reach beyond
* the end of the framebuffer.
*/
static void drm_fb_helper_memory_range_to_clip(struct fb_info *info, off_t off, size_t len,
struct drm_rect *clip)
{
u32 line_length = info->fix.line_length;
u32 fb_height = info->var.yres;
off_t end = off + len;
u32 x1 = 0;
u32 y1 = off / line_length;
u32 x2 = info->var.xres;
u32 y2 = DIV_ROUND_UP(end, line_length);
/* Don't allow any of them beyond the bottom bound of display area */
if (y1 > fb_height)
y1 = fb_height;
if (y2 > fb_height)
y2 = fb_height;
if ((y2 - y1) == 1) {
/*
* We've only written to a single scanline. Try to reduce
* the number of horizontal pixels that need an update.
*/
off_t bit_off = (off % line_length) * 8;
off_t bit_end = (end % line_length) * 8;
x1 = bit_off / info->var.bits_per_pixel;
x2 = DIV_ROUND_UP(bit_end, info->var.bits_per_pixel);
}
drm_rect_init(clip, x1, y1, x2 - x1, y2 - y1);
}
/**
* drm_fb_helper_deferred_io() - fbdev deferred_io callback function
* @info: fb_info struct pointer
* @pagereflist: list of mmap framebuffer pages that have to be flushed
*
* This function is used as the &fb_deferred_io.deferred_io
* callback function for flushing the fbdev mmap writes.
*/
void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist)
{
struct drm_fb_helper *helper = info->par;
unsigned long start, end, min_off, max_off;
struct fb_deferred_io_pageref *pageref;
struct drm_rect damage_area;
min_off = ULONG_MAX;
max_off = 0;
list_for_each_entry(pageref, pagereflist, list) {
start = pageref->offset;
end = start + PAGE_SIZE;
min_off = min(min_off, start);
max_off = max(max_off, end);
}
/*
* As we can only track pages, we might reach beyond the end
* of the screen and account for non-existing scanlines. Hence,
* keep the covered memory area within the screen buffer.
*/
max_off = min(max_off, info->screen_size);
if (min_off < max_off) {
drm_fb_helper_memory_range_to_clip(info, min_off, max_off - min_off, &damage_area);
drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
drm_rect_width(&damage_area),
drm_rect_height(&damage_area));
}
}
EXPORT_SYMBOL(drm_fb_helper_deferred_io);
typedef ssize_t (*drm_fb_helper_read_screen)(struct fb_info *info, char __user *buf,
size_t count, loff_t pos);
static ssize_t __drm_fb_helper_read(struct fb_info *info, char __user *buf, size_t count,
loff_t *ppos, drm_fb_helper_read_screen read_screen)
{
loff_t pos = *ppos;
size_t total_size;
ssize_t ret;
if (info->screen_size)
total_size = info->screen_size;
else
total_size = info->fix.smem_len;
if (pos >= total_size)
return 0;
if (count >= total_size)
count = total_size;
if (total_size - count < pos)
count = total_size - pos;
if (info->fbops->fb_sync)
info->fbops->fb_sync(info);
ret = read_screen(info, buf, count, pos);
if (ret > 0)
*ppos += ret;
return ret;
}
typedef ssize_t (*drm_fb_helper_write_screen)(struct fb_info *info, const char __user *buf,
size_t count, loff_t pos);
static ssize_t __drm_fb_helper_write(struct fb_info *info, const char __user *buf, size_t count,
loff_t *ppos, drm_fb_helper_write_screen write_screen)
{
loff_t pos = *ppos;
size_t total_size;
ssize_t ret;
int err = 0;
if (info->screen_size)
total_size = info->screen_size;
else
total_size = info->fix.smem_len;
if (pos > total_size)
return -EFBIG;
if (count > total_size) {
err = -EFBIG;
count = total_size;
}
if (total_size - count < pos) {
if (!err)
err = -ENOSPC;
count = total_size - pos;
}
if (info->fbops->fb_sync)
info->fbops->fb_sync(info);
/*
* Copy to framebuffer even if we already logged an error. Emulates
* the behavior of the original fbdev implementation.
*/
ret = write_screen(info, buf, count, pos);
if (ret < 0)
return ret; /* return last error, if any */
else if (!ret)
return err; /* return previous error, if any */
*ppos += ret;
return ret;
}
static ssize_t drm_fb_helper_read_screen_buffer(struct fb_info *info, char __user *buf,
size_t count, loff_t pos)
{
const char *src = info->screen_buffer + pos;
if (copy_to_user(buf, src, count))
return -EFAULT;
return count;
}
/**
* drm_fb_helper_sys_read - Implements struct &fb_ops.fb_read for system memory
* @info: fb_info struct pointer
* @buf: userspace buffer to read from framebuffer memory
* @count: number of bytes to read from framebuffer memory
* @ppos: read offset within framebuffer memory
*
* Returns:
* The number of bytes read on success, or an error code otherwise.
*/
ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
size_t count, loff_t *ppos)
{
return __drm_fb_helper_read(info, buf, count, ppos, drm_fb_helper_read_screen_buffer);
}
EXPORT_SYMBOL(drm_fb_helper_sys_read);
static ssize_t drm_fb_helper_write_screen_buffer(struct fb_info *info, const char __user *buf,
size_t count, loff_t pos)
{
char *dst = info->screen_buffer + pos;
if (copy_from_user(dst, buf, count))
return -EFAULT;
return count;
}
/**
* drm_fb_helper_sys_write - Implements struct &fb_ops.fb_write for system memory
* @info: fb_info struct pointer
* @buf: userspace buffer to write to framebuffer memory
* @count: number of bytes to write to framebuffer memory
* @ppos: write offset within framebuffer memory
*
* Returns:
* The number of bytes written on success, or an error code otherwise.
*/
ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos)
{
struct drm_fb_helper *helper = info->par;
loff_t pos = *ppos;
ssize_t ret;
struct drm_rect damage_area;
ret = __drm_fb_helper_write(info, buf, count, ppos, drm_fb_helper_write_screen_buffer);
if (ret <= 0)
return ret;
if (helper->funcs->fb_dirty) {
drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area);
drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
drm_rect_width(&damage_area),
drm_rect_height(&damage_area));
}
return ret;
}
EXPORT_SYMBOL(drm_fb_helper_sys_write);
/**
* drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
* @info: fbdev registered by the helper
* @rect: info about rectangle to fill
*
* A wrapper around sys_fillrect implemented by fbdev core
*/
void drm_fb_helper_sys_fillrect(struct fb_info *info,
const struct fb_fillrect *rect)
{
struct drm_fb_helper *helper = info->par;
sys_fillrect(info, rect);
if (helper->funcs->fb_dirty)
drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
}
EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
/**
* drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
* @info: fbdev registered by the helper
* @area: info about area to copy
*
* A wrapper around sys_copyarea implemented by fbdev core
*/
void drm_fb_helper_sys_copyarea(struct fb_info *info,
const struct fb_copyarea *area)
{
struct drm_fb_helper *helper = info->par;
sys_copyarea(info, area);
if (helper->funcs->fb_dirty)
drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
}
EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
/**
* drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
* @info: fbdev registered by the helper
* @image: info about image to blit
*
* A wrapper around sys_imageblit implemented by fbdev core
*/
void drm_fb_helper_sys_imageblit(struct fb_info *info,
const struct fb_image *image)
{
struct drm_fb_helper *helper = info->par;
sys_imageblit(info, image);
if (helper->funcs->fb_dirty)
drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
}
EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
static ssize_t fb_read_screen_base(struct fb_info *info, char __user *buf, size_t count,
loff_t pos)
{
const char __iomem *src = info->screen_base + pos;
size_t alloc_size = min_t(size_t, count, PAGE_SIZE);
ssize_t ret = 0;
int err = 0;
char *tmp;
tmp = kmalloc(alloc_size, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
while (count) {
size_t c = min_t(size_t, count, alloc_size);
memcpy_fromio(tmp, src, c);
if (copy_to_user(buf, tmp, c)) {
err = -EFAULT;
break;
}
src += c;
buf += c;
ret += c;
count -= c;
}
kfree(tmp);
return ret ? ret : err;
}
/**
* drm_fb_helper_cfb_read - Implements struct &fb_ops.fb_read for I/O memory
* @info: fb_info struct pointer
* @buf: userspace buffer to read from framebuffer memory
* @count: number of bytes to read from framebuffer memory
* @ppos: read offset within framebuffer memory
*
* Returns:
* The number of bytes read on success, or an error code otherwise.
*/
ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf,
size_t count, loff_t *ppos)
{
return __drm_fb_helper_read(info, buf, count, ppos, fb_read_screen_base);
}
EXPORT_SYMBOL(drm_fb_helper_cfb_read);
static ssize_t fb_write_screen_base(struct fb_info *info, const char __user *buf, size_t count,
loff_t pos)
{
char __iomem *dst = info->screen_base + pos;
size_t alloc_size = min_t(size_t, count, PAGE_SIZE);
ssize_t ret = 0;
int err = 0;
u8 *tmp;
tmp = kmalloc(alloc_size, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
while (count) {
size_t c = min_t(size_t, count, alloc_size);
if (copy_from_user(tmp, buf, c)) {
err = -EFAULT;
break;
}
memcpy_toio(dst, tmp, c);
dst += c;
buf += c;
ret += c;
count -= c;
}
kfree(tmp);
return ret ? ret : err;
}
/**
* drm_fb_helper_cfb_write - Implements struct &fb_ops.fb_write for I/O memory
* @info: fb_info struct pointer
* @buf: userspace buffer to write to framebuffer memory
* @count: number of bytes to write to framebuffer memory
* @ppos: write offset within framebuffer memory
*
* Returns:
* The number of bytes written on success, or an error code otherwise.
*/
ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos)
{
struct drm_fb_helper *helper = info->par;
loff_t pos = *ppos;
ssize_t ret;
struct drm_rect damage_area;
ret = __drm_fb_helper_write(info, buf, count, ppos, fb_write_screen_base);
if (ret <= 0)
return ret;
if (helper->funcs->fb_dirty) {
drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area);
drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
drm_rect_width(&damage_area),
drm_rect_height(&damage_area));
}
return ret;
}
EXPORT_SYMBOL(drm_fb_helper_cfb_write);
/**
* drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
* @info: fbdev registered by the helper
* @rect: info about rectangle to fill
*
* A wrapper around cfb_fillrect implemented by fbdev core
*/
void drm_fb_helper_cfb_fillrect(struct fb_info *info,
const struct fb_fillrect *rect)
{
struct drm_fb_helper *helper = info->par;
cfb_fillrect(info, rect);
if (helper->funcs->fb_dirty)
drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
}
EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
/**
* drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
* @info: fbdev registered by the helper
* @area: info about area to copy
*
* A wrapper around cfb_copyarea implemented by fbdev core
*/
void drm_fb_helper_cfb_copyarea(struct fb_info *info,
const struct fb_copyarea *area)
{
struct drm_fb_helper *helper = info->par;
cfb_copyarea(info, area);
if (helper->funcs->fb_dirty)
drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
}
EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
/**
* drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
* @info: fbdev registered by the helper
* @image: info about image to blit
*
* A wrapper around cfb_imageblit implemented by fbdev core
*/
void drm_fb_helper_cfb_imageblit(struct fb_info *info,
const struct fb_image *image)
{
struct drm_fb_helper *helper = info->par;
cfb_imageblit(info, image);
if (helper->funcs->fb_dirty)
drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
}
EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
/**
* drm_fb_helper_set_suspend - wrapper around fb_set_suspend
* @fb_helper: driver-allocated fbdev helper, can be NULL
* @suspend: whether to suspend or resume
*
* A wrapper around fb_set_suspend implemented by fbdev core.
* Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
* the lock yourself
*/
void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
{
if (fb_helper && fb_helper->info)
fb_set_suspend(fb_helper->info, suspend);
}
EXPORT_SYMBOL(drm_fb_helper_set_suspend);
/**
* drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
* takes the console lock
* @fb_helper: driver-allocated fbdev helper, can be NULL
* @suspend: whether to suspend or resume
*
* A wrapper around fb_set_suspend() that takes the console lock. If the lock
* isn't available on resume, a worker is tasked with waiting for the lock
* to become available. The console lock can be pretty contented on resume
* due to all the printk activity.
*
* This function can be called multiple times with the same state since
* &fb_info.state is checked to see if fbdev is running or not before locking.
*
* Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
*/
void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
bool suspend)
{
if (!fb_helper || !fb_helper->info)
return;
/* make sure there's no pending/ongoing resume */
flush_work(&fb_helper->resume_work);
if (suspend) {
if (fb_helper->info->state != FBINFO_STATE_RUNNING)
return;
console_lock();
} else {
if (fb_helper->info->state == FBINFO_STATE_RUNNING)
return;
if (!console_trylock()) {
schedule_work(&fb_helper->resume_work);
return;
}
}
fb_set_suspend(fb_helper->info, suspend);
console_unlock();
}
EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
{
u32 *palette = (u32 *)info->pseudo_palette;
int i;
if (cmap->start + cmap->len > 16)
return -EINVAL;
for (i = 0; i < cmap->len; ++i) {
u16 red = cmap->red[i];
u16 green = cmap->green[i];
u16 blue = cmap->blue[i];
u32 value;
red >>= 16 - info->var.red.length;
green >>= 16 - info->var.green.length;
blue >>= 16 - info->var.blue.length;
value = (red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset);
if (info->var.transp.length > 0) {
u32 mask = (1 << info->var.transp.length) - 1;
mask <<= info->var.transp.offset;
value |= mask;
}
palette[cmap->start + i] = value;
}
return 0;
}
static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_mode_set *modeset;
struct drm_crtc *crtc;
u16 *r, *g, *b;
int ret = 0;
drm_modeset_lock_all(fb_helper->dev);
drm_client_for_each_modeset(modeset, &fb_helper->client) {
crtc = modeset->crtc;
if (!crtc->funcs->gamma_set || !crtc->gamma_size) {
ret = -EINVAL;
goto out;
}
if (cmap->start + cmap->len > crtc->gamma_size) {
ret = -EINVAL;
goto out;
}
r = crtc->gamma_store;
g = r + crtc->gamma_size;
b = g + crtc->gamma_size;
memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
ret = crtc->funcs->gamma_set(crtc, r, g, b,
crtc->gamma_size, NULL);
if (ret)
goto out;
}
out:
drm_modeset_unlock_all(fb_helper->dev);
return ret;
}
static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc,
struct fb_cmap *cmap)
{
struct drm_device *dev = crtc->dev;
struct drm_property_blob *gamma_lut;
struct drm_color_lut *lut;
int size = crtc->gamma_size;
int i;
if (!size || cmap->start + cmap->len > size)
return ERR_PTR(-EINVAL);
gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL);
if (IS_ERR(gamma_lut))
return gamma_lut;
lut = gamma_lut->data;
if (cmap->start || cmap->len != size) {
u16 *r = crtc->gamma_store;
u16 *g = r + crtc->gamma_size;
u16 *b = g + crtc->gamma_size;
for (i = 0; i < cmap->start; i++) {
lut[i].red = r[i];
lut[i].green = g[i];
lut[i].blue = b[i];
}
for (i = cmap->start + cmap->len; i < size; i++) {
lut[i].red = r[i];
lut[i].green = g[i];
lut[i].blue = b[i];
}
}
for (i = 0; i < cmap->len; i++) {
lut[cmap->start + i].red = cmap->red[i];
lut[cmap->start + i].green = cmap->green[i];
lut[cmap->start + i].blue = cmap->blue[i];
}
return gamma_lut;
}
static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
struct drm_property_blob *gamma_lut = NULL;
struct drm_modeset_acquire_ctx ctx;
struct drm_crtc_state *crtc_state;
struct drm_atomic_state *state;
struct drm_mode_set *modeset;
struct drm_crtc *crtc;
u16 *r, *g, *b;
bool replaced;
int ret = 0;
drm_modeset_acquire_init(&ctx, 0);
state = drm_atomic_state_alloc(dev);
if (!state) {
ret = -ENOMEM;
goto out_ctx;
}
state->acquire_ctx = &ctx;
retry:
drm_client_for_each_modeset(modeset, &fb_helper->client) {
crtc = modeset->crtc;
if (!gamma_lut)
gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
if (IS_ERR(gamma_lut)) {
ret = PTR_ERR(gamma_lut);
gamma_lut = NULL;
goto out_state;
}
crtc_state = drm_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state)) {
ret = PTR_ERR(crtc_state);
goto out_state;
}
/*
* FIXME: This always uses gamma_lut. Some HW have only
* degamma_lut, in which case we should reset gamma_lut and set
* degamma_lut. See drm_crtc_legacy_gamma_set().
*/
replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
NULL);
replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
gamma_lut);
crtc_state->color_mgmt_changed |= replaced;
}
ret = drm_atomic_commit(state);
if (ret)
goto out_state;
drm_client_for_each_modeset(modeset, &fb_helper->client) {
crtc = modeset->crtc;
r = crtc->gamma_store;
g = r + crtc->gamma_size;
b = g + crtc->gamma_size;
memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
}
out_state:
if (ret == -EDEADLK)
goto backoff;
drm_property_blob_put(gamma_lut);
drm_atomic_state_put(state);
out_ctx:
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
return ret;
backoff:
drm_atomic_state_clear(state);
drm_modeset_backoff(&ctx);
goto retry;
}
/**
* drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
* @cmap: cmap to set
* @info: fbdev registered by the helper
*/
int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
int ret;
if (oops_in_progress)
return -EBUSY;
mutex_lock(&fb_helper->lock);
if (!drm_master_internal_acquire(dev)) {
ret = -EBUSY;
goto unlock;
}
mutex_lock(&fb_helper->client.modeset_mutex);
if (info->fix.visual == FB_VISUAL_TRUECOLOR)
ret = setcmap_pseudo_palette(cmap, info);
else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
ret = setcmap_atomic(cmap, info);
else
ret = setcmap_legacy(cmap, info);
mutex_unlock(&fb_helper->client.modeset_mutex);
drm_master_internal_release(dev);
unlock:
mutex_unlock(&fb_helper->lock);
return ret;
}
EXPORT_SYMBOL(drm_fb_helper_setcmap);
/**
* drm_fb_helper_ioctl - legacy ioctl implementation
* @info: fbdev registered by the helper
* @cmd: ioctl command
* @arg: ioctl argument
*
* A helper to implement the standard fbdev ioctl. Only
* FBIO_WAITFORVSYNC is implemented for now.
*/
int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
struct drm_crtc *crtc;
int ret = 0;
mutex_lock(&fb_helper->lock);
if (!drm_master_internal_acquire(dev)) {
ret = -EBUSY;
goto unlock;
}
switch (cmd) {
case FBIO_WAITFORVSYNC:
/*
* Only consider the first CRTC.
*
* This ioctl is supposed to take the CRTC number as
* an argument, but in fbdev times, what that number
* was supposed to be was quite unclear, different
* drivers were passing that argument differently
* (some by reference, some by value), and most of the
* userspace applications were just hardcoding 0 as an
* argument.
*
* The first CRTC should be the integrated panel on
* most drivers, so this is the best choice we can
* make. If we're not smart enough here, one should
* just consider switch the userspace to KMS.
*/
crtc = fb_helper->client.modesets[0].crtc;
/*
* Only wait for a vblank event if the CRTC is
* enabled, otherwise just don't do anythintg,
* not even report an error.
*/
ret = drm_crtc_vblank_get(crtc);
if (!ret) {
drm_crtc_wait_one_vblank(crtc);
drm_crtc_vblank_put(crtc);
}
ret = 0;
break;
default:
ret = -ENOTTY;
}
drm_master_internal_release(dev);
unlock:
mutex_unlock(&fb_helper->lock);
return ret;
}
EXPORT_SYMBOL(drm_fb_helper_ioctl);
static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1,
const struct fb_var_screeninfo *var_2)
{
return var_1->bits_per_pixel == var_2->bits_per_pixel &&
var_1->grayscale == var_2->grayscale &&
var_1->red.offset == var_2->red.offset &&
var_1->red.length == var_2->red.length &&
var_1->red.msb_right == var_2->red.msb_right &&
var_1->green.offset == var_2->green.offset &&
var_1->green.length == var_2->green.length &&
var_1->green.msb_right == var_2->green.msb_right &&
var_1->blue.offset == var_2->blue.offset &&
var_1->blue.length == var_2->blue.length &&
var_1->blue.msb_right == var_2->blue.msb_right &&
var_1->transp.offset == var_2->transp.offset &&
var_1->transp.length == var_2->transp.length &&
var_1->transp.msb_right == var_2->transp.msb_right;
}
static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
const struct drm_format_info *format)
{
u8 depth = format->depth;
if (format->is_color_indexed) {
var->red.offset = 0;
var->green.offset = 0;
var->blue.offset = 0;
var->red.length = depth;
var->green.length = depth;
var->blue.length = depth;
var->transp.offset = 0;
var->transp.length = 0;
return;
}
switch (depth) {
case 15:
var->red.offset = 10;
var->green.offset = 5;
var->blue.offset = 0;
var->red.length = 5;
var->green.length = 5;
var->blue.length = 5;
var->transp.offset = 15;
var->transp.length = 1;
break;
case 16:
var->red.offset = 11;
var->green.offset = 5;
var->blue.offset = 0;
var->red.length = 5;
var->green.length = 6;
var->blue.length = 5;
var->transp.offset = 0;
break;
case 24:
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 0;
break;
case 32:
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.offset = 24;
var->transp.length = 8;
break;
default:
break;
}
}
/**
* drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
* @var: screeninfo to check
* @info: fbdev registered by the helper
*/
int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_framebuffer *fb = fb_helper->fb;
const struct drm_format_info *format = fb->format;
struct drm_device *dev = fb_helper->dev;
unsigned int bpp;
if (in_dbg_master())
return -EINVAL;
if (var->pixclock != 0) {
drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n");
var->pixclock = 0;
}
switch (format->format) {
case DRM_FORMAT_C1:
case DRM_FORMAT_C2:
case DRM_FORMAT_C4:
/* supported format with sub-byte pixels */
break;
default:
if ((drm_format_info_block_width(format, 0) > 1) ||
(drm_format_info_block_height(format, 0) > 1))
return -EINVAL;
break;
}
/*
* Changes struct fb_var_screeninfo are currently not pushed back
* to KMS, hence fail if different settings are requested.
*/
bpp = drm_format_info_bpp(format, 0);
if (var->bits_per_pixel > bpp ||
var->xres > fb->width || var->yres > fb->height ||
var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb "
"request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
var->xres, var->yres, var->bits_per_pixel,
var->xres_virtual, var->yres_virtual,
fb->width, fb->height, bpp);
return -EINVAL;
}
var->xres_virtual = fb->width;
var->yres_virtual = fb->height;
/*
* Workaround for SDL 1.2, which is known to be setting all pixel format
* fields values to zero in some cases. We treat this situation as a
* kind of "use some reasonable autodetected values".
*/
if (!var->red.offset && !var->green.offset &&
!var->blue.offset && !var->transp.offset &&
!var->red.length && !var->green.length &&
!var->blue.length && !var->transp.length &&
!var->red.msb_right && !var->green.msb_right &&
!var->blue.msb_right && !var->transp.msb_right) {
drm_fb_helper_fill_pixel_fmt(var, format);
}
/*
* Likewise, bits_per_pixel should be rounded up to a supported value.
*/
var->bits_per_pixel = bpp;
/*
* drm fbdev emulation doesn't support changing the pixel format at all,
* so reject all pixel format changing requests.
*/
if (!drm_fb_pixel_format_equal(var, &info->var)) {
drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel format\n");
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_check_var);
/**
* drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
* @info: fbdev registered by the helper
*
* This will let fbcon do the mode init and is called at initialization time by
* the fbdev core when registering the driver, and later on through the hotplug
* callback.
*/
int drm_fb_helper_set_par(struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct fb_var_screeninfo *var = &info->var;
bool force;
if (oops_in_progress)
return -EBUSY;
if (var->pixclock != 0) {
drm_err(fb_helper->dev, "PIXEL CLOCK SET\n");
return -EINVAL;
}
/*
* Normally we want to make sure that a kms master takes precedence over
* fbdev, to avoid fbdev flickering and occasionally stealing the
* display status. But Xorg first sets the vt back to text mode using
* the KDSET IOCTL with KD_TEXT, and only after that drops the master
* status when exiting.
*
* In the past this was caught by drm_fb_helper_lastclose(), but on
* modern systems where logind always keeps a drm fd open to orchestrate
* the vt switching, this doesn't work.
*
* To not break the userspace ABI we have this special case here, which
* is only used for the above case. Everything else uses the normal
* commit function, which ensures that we never steal the display from
* an active drm master.
*/
force = var->activate & FB_ACTIVATE_KD_TEXT;
__drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, force);
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_set_par);
static void pan_set(struct drm_fb_helper *fb_helper, int x, int y)
{
struct drm_mode_set *mode_set;
mutex_lock(&fb_helper->client.modeset_mutex);
drm_client_for_each_modeset(mode_set, &fb_helper->client) {
mode_set->x = x;
mode_set->y = y;
}
mutex_unlock(&fb_helper->client.modeset_mutex);
}
static int pan_display_atomic(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
int ret;
pan_set(fb_helper, var->xoffset, var->yoffset);
ret = drm_client_modeset_commit_locked(&fb_helper->client);
if (!ret) {
info->var.xoffset = var->xoffset;
info->var.yoffset = var->yoffset;
} else
pan_set(fb_helper, info->var.xoffset, info->var.yoffset);
return ret;
}
static int pan_display_legacy(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_client_dev *client = &fb_helper->client;
struct drm_mode_set *modeset;
int ret = 0;
mutex_lock(&client->modeset_mutex);
drm_modeset_lock_all(fb_helper->dev);
drm_client_for_each_modeset(modeset, client) {
modeset->x = var->xoffset;
modeset->y = var->yoffset;
if (modeset->num_connectors) {
ret = drm_mode_set_config_internal(modeset);
if (!ret) {
info->var.xoffset = var->xoffset;
info->var.yoffset = var->yoffset;
}
}
}
drm_modeset_unlock_all(fb_helper->dev);
mutex_unlock(&client->modeset_mutex);
return ret;
}
/**
* drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
* @var: updated screen information
* @info: fbdev registered by the helper
*/
int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
int ret;
if (oops_in_progress)
return -EBUSY;
mutex_lock(&fb_helper->lock);
if (!drm_master_internal_acquire(dev)) {
ret = -EBUSY;
goto unlock;
}
if (drm_drv_uses_atomic_modeset(dev))
ret = pan_display_atomic(var, info);
else
ret = pan_display_legacy(var, info);
drm_master_internal_release(dev);
unlock:
mutex_unlock(&fb_helper->lock);
return ret;
}
EXPORT_SYMBOL(drm_fb_helper_pan_display);
static uint32_t drm_fb_helper_find_format(struct drm_fb_helper *fb_helper, const uint32_t *formats,
size_t format_count, uint32_t bpp, uint32_t depth)
{
struct drm_device *dev = fb_helper->dev;
uint32_t format;
size_t i;
/*
* Do not consider YUV or other complicated formats
* for framebuffers. This means only legacy formats
* are supported (fmt->depth is a legacy field), but
* the framebuffer emulation can only deal with such
* formats, specifically RGB/BGA formats.
*/
format = drm_mode_legacy_fb_format(bpp, depth);
if (!format)
goto err;
for (i = 0; i < format_count; ++i) {
if (formats[i] == format)
return format;
}
err:
/* We found nothing. */
drm_warn(dev, "bpp/depth value of %u/%u not supported\n", bpp, depth);
return DRM_FORMAT_INVALID;
}
static uint32_t drm_fb_helper_find_color_mode_format(struct drm_fb_helper *fb_helper,
const uint32_t *formats, size_t format_count,
unsigned int color_mode)
{
struct drm_device *dev = fb_helper->dev;
uint32_t bpp, depth;
switch (color_mode) {
case 1:
case 2:
case 4:
case 8:
case 16:
case 24:
bpp = depth = color_mode;
break;
case 15:
bpp = 16;
depth = 15;
break;
case 32:
bpp = 32;
depth = 24;
break;
default:
drm_info(dev, "unsupported color mode of %d\n", color_mode);
return DRM_FORMAT_INVALID;
}
return drm_fb_helper_find_format(fb_helper, formats, format_count, bpp, depth);
}
static int __drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper,
struct drm_fb_helper_surface_size *sizes)
{
struct drm_client_dev *client = &fb_helper->client;
struct drm_device *dev = fb_helper->dev;
int crtc_count = 0;
struct drm_connector_list_iter conn_iter;
struct drm_connector *connector;
struct drm_mode_set *mode_set;
uint32_t surface_format = DRM_FORMAT_INVALID;
const struct drm_format_info *info;
memset(sizes, 0, sizeof(*sizes));
sizes->fb_width = (u32)-1;
sizes->fb_height = (u32)-1;
drm_client_for_each_modeset(mode_set, client) {
struct drm_crtc *crtc = mode_set->crtc;
struct drm_plane *plane = crtc->primary;
drm_dbg_kms(dev, "test CRTC %u primary plane\n", drm_crtc_index(crtc));
drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
drm_client_for_each_connector_iter(connector, &conn_iter) {
struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode;
if (!cmdline_mode->bpp_specified)
continue;
surface_format = drm_fb_helper_find_color_mode_format(fb_helper,
plane->format_types,
plane->format_count,
cmdline_mode->bpp);
if (surface_format != DRM_FORMAT_INVALID)
break; /* found supported format */
}
drm_connector_list_iter_end(&conn_iter);
if (surface_format != DRM_FORMAT_INVALID)
break; /* found supported format */
/* try preferred color mode */
surface_format = drm_fb_helper_find_color_mode_format(fb_helper,
plane->format_types,
plane->format_count,
fb_helper->preferred_bpp);
if (surface_format != DRM_FORMAT_INVALID)
break; /* found supported format */
}
if (surface_format == DRM_FORMAT_INVALID) {
/*
* If none of the given color modes works, fall back
* to XRGB8888. Drivers are expected to provide this
* format for compatibility with legacy applications.
*/
drm_warn(dev, "No compatible format found\n");
surface_format = drm_driver_legacy_fb_format(dev, 32, 24);
}
info = drm_format_info(surface_format);
sizes->surface_bpp = drm_format_info_bpp(info, 0);
sizes->surface_depth = info->depth;
/* first up get a count of crtcs now in use and new min/maxes width/heights */
crtc_count = 0;
drm_client_for_each_modeset(mode_set, client) {
struct drm_display_mode *desired_mode;
int x, y, j;
/* in case of tile group, are we the last tile vert or horiz?
* If no tile group you are always the last one both vertically
* and horizontally
*/
bool lastv = true, lasth = true;
desired_mode = mode_set->mode;
if (!desired_mode)
continue;
crtc_count++;
x = mode_set->x;
y = mode_set->y;
sizes->surface_width =
max_t(u32, desired_mode->hdisplay + x, sizes->surface_width);
sizes->surface_height =
max_t(u32, desired_mode->vdisplay + y, sizes->surface_height);
for (j = 0; j < mode_set->num_connectors; j++) {
struct drm_connector *connector = mode_set->connectors[j];
if (connector->has_tile &&
desired_mode->hdisplay == connector->tile_h_size &&
desired_mode->vdisplay == connector->tile_v_size) {
lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
/* cloning to multiple tiles is just crazy-talk, so: */
break;
}
}
if (lasth)
sizes->fb_width = min_t(u32, desired_mode->hdisplay + x, sizes->fb_width);
if (lastv)
sizes->fb_height = min_t(u32, desired_mode->vdisplay + y, sizes->fb_height);
}
if (crtc_count == 0 || sizes->fb_width == -1 || sizes->fb_height == -1) {
drm_info(dev, "Cannot find any crtc or sizes\n");
return -EAGAIN;
}
return 0;
}
static int drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper,
struct drm_fb_helper_surface_size *sizes)
{
struct drm_client_dev *client = &fb_helper->client;
struct drm_device *dev = fb_helper->dev;
struct drm_mode_config *config = &dev->mode_config;
int ret;
mutex_lock(&client->modeset_mutex);
ret = __drm_fb_helper_find_sizes(fb_helper, sizes);
mutex_unlock(&client->modeset_mutex);
if (ret)
return ret;
/* Handle our overallocation */
sizes->surface_height *= drm_fbdev_overalloc;
sizes->surface_height /= 100;
if (sizes->surface_height > config->max_height) {
drm_dbg_kms(dev, "Fbdev over-allocation too large; clamping height to %d\n",
config->max_height);
sizes->surface_height = config->max_height;
}
return 0;
}
/*
* Allocates the backing storage and sets up the fbdev info structure through
* the ->fb_probe callback.
*/
static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
{
struct drm_client_dev *client = &fb_helper->client;
struct drm_device *dev = fb_helper->dev;
struct drm_fb_helper_surface_size sizes;
int ret;
ret = drm_fb_helper_find_sizes(fb_helper, &sizes);
if (ret) {
/* First time: disable all crtc's.. */
if (!fb_helper->deferred_setup)
drm_client_modeset_commit(client);
return ret;
}
#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
fb_helper->hint_leak_smem_start = drm_leak_fbdev_smem;
#endif
/* push down into drivers */
ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
if (ret < 0)
return ret;
strcpy(fb_helper->fb->comm, "[fbcon]");
/* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
if (dev_is_pci(dev->dev))
vga_switcheroo_client_fb_set(to_pci_dev(dev->dev), fb_helper->info);
return 0;
}
static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
bool is_color_indexed)
{
info->fix.type = FB_TYPE_PACKED_PIXELS;
info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR
: FB_VISUAL_TRUECOLOR;
info->fix.mmio_start = 0;
info->fix.mmio_len = 0;
info->fix.type_aux = 0;
info->fix.xpanstep = 1; /* doing it in hw */
info->fix.ypanstep = 1; /* doing it in hw */
info->fix.ywrapstep = 0;
info->fix.accel = FB_ACCEL_NONE;
info->fix.line_length = pitch;
}
static void drm_fb_helper_fill_var(struct fb_info *info,
struct drm_fb_helper *fb_helper,
uint32_t fb_width, uint32_t fb_height)
{
struct drm_framebuffer *fb = fb_helper->fb;
const struct drm_format_info *format = fb->format;
switch (format->format) {
case DRM_FORMAT_C1:
case DRM_FORMAT_C2:
case DRM_FORMAT_C4:
/* supported format with sub-byte pixels */
break;
default:
WARN_ON((drm_format_info_block_width(format, 0) > 1) ||
(drm_format_info_block_height(format, 0) > 1));
break;
}
info->pseudo_palette = fb_helper->pseudo_palette;
info->var.xres_virtual = fb->width;
info->var.yres_virtual = fb->height;
info->var.bits_per_pixel = drm_format_info_bpp(format, 0);
info->var.accel_flags = FB_ACCELF_TEXT;
info->var.xoffset = 0;
info->var.yoffset = 0;
info->var.activate = FB_ACTIVATE_NOW;
drm_fb_helper_fill_pixel_fmt(&info->var, format);
info->var.xres = fb_width;
info->var.yres = fb_height;
}
/**
* drm_fb_helper_fill_info - initializes fbdev information
* @info: fbdev instance to set up
* @fb_helper: fb helper instance to use as template
* @sizes: describes fbdev size and scanout surface size
*
* Sets up the variable and fixed fbdev metainformation from the given fb helper
* instance and the drm framebuffer allocated in &drm_fb_helper.fb.
*
* Drivers should call this (or their equivalent setup code) from their
* &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
* backing storage framebuffer.
*/
void drm_fb_helper_fill_info(struct fb_info *info,
struct drm_fb_helper *fb_helper,
struct drm_fb_helper_surface_size *sizes)
{
struct drm_framebuffer *fb = fb_helper->fb;
drm_fb_helper_fill_fix(info, fb->pitches[0],
fb->format->is_color_indexed);
drm_fb_helper_fill_var(info, fb_helper,
sizes->fb_width, sizes->fb_height);
info->par = fb_helper;
/*
* The DRM drivers fbdev emulation device name can be confusing if the
* driver name also has a "drm" suffix on it. Leading to names such as
* "simpledrmdrmfb" in /proc/fb. Unfortunately, it's an uAPI and can't
* be changed due user-space tools (e.g: pm-utils) matching against it.
*/
snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
fb_helper->dev->driver->name);
}
EXPORT_SYMBOL(drm_fb_helper_fill_info);
/*
* This is a continuation of drm_setup_crtcs() that sets up anything related
* to the framebuffer. During initialization, drm_setup_crtcs() is called before
* the framebuffer has been allocated (fb_helper->fb and fb_helper->info).
* So, any setup that touches those fields needs to be done here instead of in
* drm_setup_crtcs().
*/
static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
{
struct drm_client_dev *client = &fb_helper->client;
struct drm_connector_list_iter conn_iter;
struct fb_info *info = fb_helper->info;
unsigned int rotation, sw_rotations = 0;
struct drm_connector *connector;
struct drm_mode_set *modeset;
mutex_lock(&client->modeset_mutex);
drm_client_for_each_modeset(modeset, client) {
if (!modeset->num_connectors)
continue;
modeset->fb = fb_helper->fb;
if (drm_client_rotation(modeset, &rotation))
/* Rotating in hardware, fbcon should not rotate */
sw_rotations |= DRM_MODE_ROTATE_0;
else
sw_rotations |= rotation;
}
mutex_unlock(&client->modeset_mutex);
drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
drm_client_for_each_connector_iter(connector, &conn_iter) {
/* use first connected connector for the physical dimensions */
if (connector->status == connector_status_connected) {
info->var.width = connector->display_info.width_mm;
info->var.height = connector->display_info.height_mm;
break;
}
}
drm_connector_list_iter_end(&conn_iter);
switch (sw_rotations) {
case DRM_MODE_ROTATE_0:
info->fbcon_rotate_hint = FB_ROTATE_UR;
break;
case DRM_MODE_ROTATE_90:
info->fbcon_rotate_hint = FB_ROTATE_CCW;
break;
case DRM_MODE_ROTATE_180:
info->fbcon_rotate_hint = FB_ROTATE_UD;
break;
case DRM_MODE_ROTATE_270:
info->fbcon_rotate_hint = FB_ROTATE_CW;
break;
default:
/*
* Multiple bits are set / multiple rotations requested
* fbcon cannot handle separate rotation settings per
* output, so fallback to unrotated.
*/
info->fbcon_rotate_hint = FB_ROTATE_UR;
}
}
/* Note: Drops fb_helper->lock before returning. */
static int
__drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper)
{
struct drm_device *dev = fb_helper->dev;
struct fb_info *info;
unsigned int width, height;
int ret;
width = dev->mode_config.max_width;
height = dev->mode_config.max_height;
drm_client_modeset_probe(&fb_helper->client, width, height);
ret = drm_fb_helper_single_fb_probe(fb_helper);
if (ret < 0) {
if (ret == -EAGAIN) {
fb_helper->deferred_setup = true;
ret = 0;
}
mutex_unlock(&fb_helper->lock);
return ret;
}
drm_setup_crtcs_fb(fb_helper);
fb_helper->deferred_setup = false;
info = fb_helper->info;
info->var.pixclock = 0;
/* Shamelessly allow physical address leaking to userspace */
#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
if (!fb_helper->hint_leak_smem_start)
#endif
/* don't leak any physical addresses to userspace */
info->flags |= FBINFO_HIDE_SMEM_START;
/* Need to drop locks to avoid recursive deadlock in
* register_framebuffer. This is ok because the only thing left to do is
* register the fbdev emulation instance in kernel_fb_helper_list. */
mutex_unlock(&fb_helper->lock);
ret = register_framebuffer(info);
if (ret < 0)
return ret;
drm_info(dev, "fb%d: %s frame buffer device\n",
info->node, info->fix.id);
mutex_lock(&kernel_fb_helper_lock);
if (list_empty(&kernel_fb_helper_list))
register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
mutex_unlock(&kernel_fb_helper_lock);
return 0;
}
/**
* drm_fb_helper_initial_config - setup a sane initial connector configuration
* @fb_helper: fb_helper device struct
*
* Scans the CRTCs and connectors and tries to put together an initial setup.
* At the moment, this is a cloned configuration across all heads with
* a new framebuffer object as the backing store.
*
* Note that this also registers the fbdev and so allows userspace to call into
* the driver through the fbdev interfaces.
*
* This function will call down into the &drm_fb_helper_funcs.fb_probe callback
* to let the driver allocate and initialize the fbdev info structure and the
* drm framebuffer used to back the fbdev. drm_fb_helper_fill_info() is provided
* as a helper to setup simple default values for the fbdev info structure.
*
* HANG DEBUGGING:
*
* When you have fbcon support built-in or already loaded, this function will do
* a full modeset to setup the fbdev console. Due to locking misdesign in the
* VT/fbdev subsystem that entire modeset sequence has to be done while holding
* console_lock. Until console_unlock is called no dmesg lines will be sent out
* to consoles, not even serial console. This means when your driver crashes,
* you will see absolutely nothing else but a system stuck in this function,
* with no further output. Any kind of printk() you place within your own driver
* or in the drm core modeset code will also never show up.
*
* Standard debug practice is to run the fbcon setup without taking the
* console_lock as a hack, to be able to see backtraces and crashes on the
* serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
* cmdline option.
*
* The other option is to just disable fbdev emulation since very likely the
* first modeset from userspace will crash in the same way, and is even easier
* to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
* kernel cmdline option.
*
* RETURNS:
* Zero if everything went ok, nonzero otherwise.
*/
int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper)
{
int ret;
if (!drm_fbdev_emulation)
return 0;
mutex_lock(&fb_helper->lock);
ret = __drm_fb_helper_initial_config_and_unlock(fb_helper);
return ret;
}
EXPORT_SYMBOL(drm_fb_helper_initial_config);
/**
* drm_fb_helper_hotplug_event - respond to a hotplug notification by
* probing all the outputs attached to the fb
* @fb_helper: driver-allocated fbdev helper, can be NULL
*
* Scan the connectors attached to the fb_helper and try to put together a
* setup after notification of a change in output configuration.
*
* Called at runtime, takes the mode config locks to be able to check/change the
* modeset configuration. Must be run from process context (which usually means
* either the output polling work or a work item launched from the driver's
* hotplug interrupt).
*
* Note that drivers may call this even before calling
* drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
* for a race-free fbcon setup and will make sure that the fbdev emulation will
* not miss any hotplug events.
*
* RETURNS:
* 0 on success and a non-zero error code otherwise.
*/
int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
{
int err = 0;
if (!drm_fbdev_emulation || !fb_helper)
return 0;
mutex_lock(&fb_helper->lock);
if (fb_helper->deferred_setup) {
err = __drm_fb_helper_initial_config_and_unlock(fb_helper);
return err;
}
if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) {
fb_helper->delayed_hotplug = true;
mutex_unlock(&fb_helper->lock);
return err;
}
drm_master_internal_release(fb_helper->dev);
drm_dbg_kms(fb_helper->dev, "\n");
drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height);
drm_setup_crtcs_fb(fb_helper);
mutex_unlock(&fb_helper->lock);
drm_fb_helper_set_par(fb_helper->info);
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
/**
* drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation
* @dev: DRM device
*
* This function can be used as the &drm_driver->lastclose callback for drivers
* that only need to call drm_fb_helper_restore_fbdev_mode_unlocked().
*/
void drm_fb_helper_lastclose(struct drm_device *dev)
{
drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper);
}
EXPORT_SYMBOL(drm_fb_helper_lastclose);
/**
* drm_fb_helper_output_poll_changed - DRM mode config \.output_poll_changed
* helper for fbdev emulation
* @dev: DRM device
*
* This function can be used as the
* &drm_mode_config_funcs.output_poll_changed callback for drivers that only
* need to call drm_fbdev.hotplug_event().
*/
void drm_fb_helper_output_poll_changed(struct drm_device *dev)
{
drm_fb_helper_hotplug_event(dev->fb_helper);
}
EXPORT_SYMBOL(drm_fb_helper_output_poll_changed);