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drm/cma-helper: Add drm_fb_cma_fbdev_init/fini() 

Add functions drm_fb_cma_fbdev_init(), drm_fb_cma_fbdev_fini() and
drm_fb_cma_fbdev_init_with_funcs(). These functions relies on the fact
that the drm_fb_helper struct is stored in dev->drm_fb_helper_private
so drivers don't need to store it.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115142001.45358-3-noralf@tronnes.org
This commit is contained in:
Noralf Trønnes 2017-11-15 15:19:41 +01:00
parent e44f0801bb
commit 41b676e03f
2 changed files with 123 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

119
drivers/gpu/drm/drm_fb_cma_helper.c
View File

@ -23,6 +23,7 @@
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_print.h>
#include <linux/module.h>
#define DEFAULT_FBDEFIO_DELAY_MS 50
@ -42,7 +43,7 @@ struct drm_fbdev_cma {
* callback function to create a cma backed framebuffer.
*
* An fbdev framebuffer backed by cma is also available by calling
* drm_fbdev_cma_init(). drm_fbdev_cma_fini() tears it down.
* drm_fb_cma_fbdev_init(). drm_fb_cma_fbdev_fini() tears it down.
* If the &drm_framebuffer_funcs.dirty callback is set, fb_deferred_io will be
* set up automatically. &drm_framebuffer_funcs.dirty is called by
* drm_fb_helper_deferred_io() in process context (&struct delayed_work).
@ -68,7 +69,7 @@ struct drm_fbdev_cma {
*
* Initialize::
*
* fbdev = drm_fbdev_cma_init_with_funcs(dev, 16,
* fbdev = drm_fb_cma_fbdev_init_with_funcs(dev, 16,
* dev->mode_config.num_crtc,
* dev->mode_config.num_connector,
* &driver_fb_funcs);
@ -256,7 +257,7 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
fbi->screen_size = size;
fbi->fix.smem_len = size;
if (fbdev_cma->fb_funcs->dirty) {
if (fb->funcs->dirty) {
ret = drm_fbdev_cma_defio_init(fbi, obj);
if (ret)
goto err_cma_destroy;
@ -277,6 +278,118 @@ static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
.fb_probe = drm_fbdev_cma_create,
};
/**
* drm_fb_cma_fbdev_init_with_funcs() - Allocate and initialize fbdev emulation
* @dev: DRM device
* @preferred_bpp: Preferred bits per pixel for the device.
* @dev->mode_config.preferred_depth is used if this is zero.
* @max_conn_count: Maximum number of connectors.
* @dev->mode_config.num_connector is used if this is zero.
* @funcs: Framebuffer functions, in particular a custom dirty() callback.
* Can be NULL.
*
* Returns:
* Zero on success or negative error code on failure.
*/
int drm_fb_cma_fbdev_init_with_funcs(struct drm_device *dev,
unsigned int preferred_bpp, unsigned int max_conn_count,
const struct drm_framebuffer_funcs *funcs)
{
struct drm_fbdev_cma *fbdev_cma;
struct drm_fb_helper *fb_helper;
int ret;
if (!preferred_bpp)
preferred_bpp = dev->mode_config.preferred_depth;
if (!preferred_bpp)
preferred_bpp = 32;
if (!max_conn_count)
max_conn_count = dev->mode_config.num_connector;
fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
if (!fbdev_cma)
return -ENOMEM;
fbdev_cma->fb_funcs = funcs;
fb_helper = &fbdev_cma->fb_helper;
drm_fb_helper_prepare(dev, fb_helper, &drm_fb_cma_helper_funcs);
ret = drm_fb_helper_init(dev, fb_helper, max_conn_count);
if (ret < 0) {
DRM_DEV_ERROR(dev->dev, "Failed to initialize fbdev helper.\n");
goto err_free;
}
ret = drm_fb_helper_single_add_all_connectors(fb_helper);
if (ret < 0) {
DRM_DEV_ERROR(dev->dev, "Failed to add connectors.\n");
goto err_drm_fb_helper_fini;
}
ret = drm_fb_helper_initial_config(fb_helper, preferred_bpp);
if (ret < 0) {
DRM_DEV_ERROR(dev->dev, "Failed to set fbdev configuration.\n");
goto err_drm_fb_helper_fini;
}
return 0;
err_drm_fb_helper_fini:
drm_fb_helper_fini(fb_helper);
err_free:
kfree(fbdev_cma);
return ret;
}
EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_init_with_funcs);
/**
* drm_fb_cma_fbdev_init() - Allocate and initialize fbdev emulation
* @dev: DRM device
* @preferred_bpp: Preferred bits per pixel for the device.
* @dev->mode_config.preferred_depth is used if this is zero.
* @max_conn_count: Maximum number of connectors.
* @dev->mode_config.num_connector is used if this is zero.
*
* Returns:
* Zero on success or negative error code on failure.
*/
int drm_fb_cma_fbdev_init(struct drm_device *dev, unsigned int preferred_bpp,
unsigned int max_conn_count)
{
return drm_fb_cma_fbdev_init_with_funcs(dev, preferred_bpp,
max_conn_count, NULL);
}
EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_init);
/**
* drm_fb_cma_fbdev_fini() - Teardown fbdev emulation
* @dev: DRM device
*/
void drm_fb_cma_fbdev_fini(struct drm_device *dev)
{
struct drm_fb_helper *fb_helper = dev->fb_helper;
if (!fb_helper)
return;
/* Unregister if it hasn't been done already */
if (fb_helper->fbdev && fb_helper->fbdev->dev)
drm_fb_helper_unregister_fbi(fb_helper);
if (fb_helper->fbdev)
drm_fbdev_cma_defio_fini(fb_helper->fbdev);
if (fb_helper->fb)
drm_framebuffer_remove(fb_helper->fb);
drm_fb_helper_fini(fb_helper);
kfree(to_fbdev_cma(fb_helper));
}
EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_fini);
/**
* drm_fbdev_cma_init_with_funcs() - Allocate and initializes a drm_fbdev_cma struct
* @dev: DRM device

7
include/drm/drm_fb_cma_helper.h
View File

@ -16,6 +16,13 @@ struct drm_mode_fb_cmd2;
struct drm_plane;
struct drm_plane_state;
int drm_fb_cma_fbdev_init_with_funcs(struct drm_device *dev,
unsigned int preferred_bpp, unsigned int max_conn_count,
const struct drm_framebuffer_funcs *funcs);
int drm_fb_cma_fbdev_init(struct drm_device *dev, unsigned int preferred_bpp,
unsigned int max_conn_count);
void drm_fb_cma_fbdev_fini(struct drm_device *dev);
struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
unsigned int preferred_bpp, unsigned int max_conn_count,
const struct drm_framebuffer_funcs *funcs);