diff options
author | Lars-Peter Clausen <lars@metafoo.de> | 2012-07-02 14:37:47 (GMT) |
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committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2012-09-18 10:28:21 (GMT) |
commit | 2e3b3c42f06ff6801b3d7839757bbdb231619083 (patch) | |
tree | b047e7b4a69808a9a87865d71730c9fac0b39ade /drivers/gpu/drm | |
parent | b9d474500546160dd6af35f60cd8bc20edd13807 (diff) | |
download | linux-2e3b3c42f06ff6801b3d7839757bbdb231619083.tar.xz |
DRM: Add DRM KMS/FB CMA helper
This patchset introduces a set of helper function for implementing the KMS
framebuffer layer for drivers which use the DRM GEM CMA helper function.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
[Make DRM_KMS_CMA_HELPER a boolean Kconfig option]
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r-- | drivers/gpu/drm/Kconfig | 9 | ||||
-rw-r--r-- | drivers/gpu/drm/Makefile | 1 | ||||
-rw-r--r-- | drivers/gpu/drm/drm_fb_cma_helper.c | 406 |
3 files changed, 416 insertions, 0 deletions
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 2df146d..7da5f08 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -60,6 +60,15 @@ config DRM_GEM_CMA_HELPER help Choose this if you need the GEM CMA helper functions +config DRM_KMS_CMA_HELPER + bool + select DRM_GEM_CMA_HELPER + select FB_SYS_FILLRECT + select FB_SYS_COPYAREA + select FB_SYS_IMAGEBLIT + help + Choose this if you need the KMS CMA helper functions + config DRM_TDFX tristate "3dfx Banshee/Voodoo3+" depends on DRM && PCI diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 2fcedbb..58961b9 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -21,6 +21,7 @@ drm-usb-y := drm_usb.o drm_kms_helper-y := drm_fb_helper.o drm_crtc_helper.o drm_dp_i2c_helper.o drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o +drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c new file mode 100644 index 0000000..09e11a5 --- /dev/null +++ b/drivers/gpu/drm/drm_fb_cma_helper.c @@ -0,0 +1,406 @@ +/* + * drm kms/fb cma (contiguous memory allocator) helper functions + * + * Copyright (C) 2012 Analog Device Inc. + * Author: Lars-Peter Clausen <lars@metafoo.de> + * + * Based on udl_fbdev.c + * Copyright (C) 2012 Red Hat + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <drm/drmP.h> +#include <drm/drm_crtc.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_gem_cma_helper.h> +#include <drm/drm_fb_cma_helper.h> +#include <linux/module.h> + +struct drm_fb_cma { + struct drm_framebuffer fb; + struct drm_gem_cma_object *obj[4]; +}; + +struct drm_fbdev_cma { + struct drm_fb_helper fb_helper; + struct drm_fb_cma *fb; +}; + +static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper) +{ + return container_of(helper, struct drm_fbdev_cma, fb_helper); +} + +static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb) +{ + return container_of(fb, struct drm_fb_cma, fb); +} + +static void drm_fb_cma_destroy(struct drm_framebuffer *fb) +{ + struct drm_fb_cma *fb_cma = to_fb_cma(fb); + int i; + + for (i = 0; i < 4; i++) { + if (fb_cma->obj[i]) + drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base); + } + + drm_framebuffer_cleanup(fb); + kfree(fb_cma); +} + +static int drm_fb_cma_create_handle(struct drm_framebuffer *fb, + struct drm_file *file_priv, unsigned int *handle) +{ + struct drm_fb_cma *fb_cma = to_fb_cma(fb); + + return drm_gem_handle_create(file_priv, + &fb_cma->obj[0]->base, handle); +} + +static struct drm_framebuffer_funcs drm_fb_cma_funcs = { + .destroy = drm_fb_cma_destroy, + .create_handle = drm_fb_cma_create_handle, +}; + +static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev, + struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_cma_object **obj, + unsigned int num_planes) +{ + struct drm_fb_cma *fb_cma; + int ret; + int i; + + fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL); + if (!fb_cma) + return ERR_PTR(-ENOMEM); + + ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs); + if (ret) { + dev_err(dev->dev, "Failed to initalize framebuffer: %d\n", ret); + kfree(fb_cma); + return ERR_PTR(ret); + } + + drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd); + + for (i = 0; i < num_planes; i++) + fb_cma->obj[i] = obj[i]; + + return fb_cma; +} + +/** + * drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create callback function + * + * If your hardware has special alignment or pitch requirements these should be + * checked before calling this function. + */ +struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev, + struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd) +{ + struct drm_fb_cma *fb_cma; + struct drm_gem_cma_object *objs[4]; + struct drm_gem_object *obj; + unsigned int hsub; + unsigned int vsub; + int ret; + int i; + + hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format); + vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format); + + for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) { + unsigned int width = mode_cmd->width / (i ? hsub : 1); + unsigned int height = mode_cmd->height / (i ? vsub : 1); + unsigned int min_size; + + obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[i]); + if (!obj) { + dev_err(dev->dev, "Failed to lookup GEM object\n"); + ret = -ENXIO; + goto err_gem_object_unreference; + } + + min_size = (height - 1) * mode_cmd->pitches[i] + + width * drm_format_plane_cpp(mode_cmd->pixel_format, i) + + mode_cmd->offsets[i]; + + if (obj->size < min_size) { + drm_gem_object_unreference_unlocked(obj); + ret = -EINVAL; + goto err_gem_object_unreference; + } + objs[i] = to_drm_gem_cma_obj(obj); + } + + fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i); + if (IS_ERR(fb_cma)) { + ret = PTR_ERR(fb_cma); + goto err_gem_object_unreference; + } + + return &fb_cma->fb; + +err_gem_object_unreference: + for (i--; i >= 0; i--) + drm_gem_object_unreference_unlocked(&objs[i]->base); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(drm_fb_cma_create); + +/** + * drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer + * @fb: The framebuffer + * @plane: Which plane + * + * Return the CMA GEM object for given framebuffer. + * + * This function will usually be called from the CRTC callback functions. + */ +struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb, + unsigned int plane) +{ + struct drm_fb_cma *fb_cma = to_fb_cma(fb); + + if (plane >= 4) + return NULL; + + return fb_cma->obj[plane]; +} +EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj); + +static struct fb_ops drm_fbdev_cma_ops = { + .owner = THIS_MODULE, + .fb_fillrect = sys_fillrect, + .fb_copyarea = sys_copyarea, + .fb_imageblit = sys_imageblit, + .fb_check_var = drm_fb_helper_check_var, + .fb_set_par = drm_fb_helper_set_par, + .fb_blank = drm_fb_helper_blank, + .fb_pan_display = drm_fb_helper_pan_display, + .fb_setcmap = drm_fb_helper_setcmap, +}; + +static int drm_fbdev_cma_create(struct drm_fb_helper *helper, + struct drm_fb_helper_surface_size *sizes) +{ + struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper); + struct drm_mode_fb_cmd2 mode_cmd = { 0 }; + struct drm_device *dev = helper->dev; + struct drm_gem_cma_object *obj; + struct drm_framebuffer *fb; + unsigned int bytes_per_pixel; + unsigned long offset; + struct fb_info *fbi; + size_t size; + int ret; + + DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", + sizes->surface_width, sizes->surface_height, + sizes->surface_bpp); + + bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8); + + mode_cmd.width = sizes->surface_width; + mode_cmd.height = sizes->surface_height; + mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel; + mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, + sizes->surface_depth); + + size = mode_cmd.pitches[0] * mode_cmd.height; + obj = drm_gem_cma_create(dev, size); + if (!obj) + return -ENOMEM; + + fbi = framebuffer_alloc(0, dev->dev); + if (!fbi) { + dev_err(dev->dev, "Failed to allocate framebuffer info.\n"); + ret = -ENOMEM; + goto err_drm_gem_cma_free_object; + } + + fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1); + if (IS_ERR(fbdev_cma->fb)) { + dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n"); + ret = PTR_ERR(fbdev_cma->fb); + goto err_framebuffer_release; + } + + fb = &fbdev_cma->fb->fb; + helper->fb = fb; + helper->fbdev = fbi; + + fbi->par = helper; + fbi->flags = FBINFO_FLAG_DEFAULT; + fbi->fbops = &drm_fbdev_cma_ops; + + ret = fb_alloc_cmap(&fbi->cmap, 256, 0); + if (ret) { + dev_err(dev->dev, "Failed to allocate color map.\n"); + goto err_drm_fb_cma_destroy; + } + + drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); + drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height); + + offset = fbi->var.xoffset * bytes_per_pixel; + offset += fbi->var.yoffset * fb->pitches[0]; + + dev->mode_config.fb_base = (resource_size_t)obj->paddr; + fbi->screen_base = obj->vaddr + offset; + fbi->fix.smem_start = (unsigned long)(obj->paddr + offset); + fbi->screen_size = size; + fbi->fix.smem_len = size; + + return 0; + +err_drm_fb_cma_destroy: + drm_fb_cma_destroy(fb); +err_framebuffer_release: + framebuffer_release(fbi); +err_drm_gem_cma_free_object: + drm_gem_cma_free_object(&obj->base); + return ret; +} + +static int drm_fbdev_cma_probe(struct drm_fb_helper *helper, + struct drm_fb_helper_surface_size *sizes) +{ + int ret = 0; + + if (!helper->fb) { + ret = drm_fbdev_cma_create(helper, sizes); + if (ret < 0) + return ret; + ret = 1; + } + + return ret; +} + +static struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = { + .fb_probe = drm_fbdev_cma_probe, +}; + +/** + * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct + * @dev: DRM device + * @preferred_bpp: Preferred bits per pixel for the device + * @num_crtc: Number of CRTCs + * @max_conn_count: Maximum number of connectors + * + * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR. + */ +struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev, + unsigned int preferred_bpp, unsigned int num_crtc, + unsigned int max_conn_count) +{ + struct drm_fbdev_cma *fbdev_cma; + struct drm_fb_helper *helper; + int ret; + + fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL); + if (!fbdev_cma) { + dev_err(dev->dev, "Failed to allocate drm fbdev.\n"); + return ERR_PTR(-ENOMEM); + } + + fbdev_cma->fb_helper.funcs = &drm_fb_cma_helper_funcs; + helper = &fbdev_cma->fb_helper; + + ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count); + if (ret < 0) { + dev_err(dev->dev, "Failed to initialize drm fb helper.\n"); + goto err_free; + } + + ret = drm_fb_helper_single_add_all_connectors(helper); + if (ret < 0) { + dev_err(dev->dev, "Failed to add connectors.\n"); + goto err_drm_fb_helper_fini; + + } + + ret = drm_fb_helper_initial_config(helper, preferred_bpp); + if (ret < 0) { + dev_err(dev->dev, "Failed to set inital hw configuration.\n"); + goto err_drm_fb_helper_fini; + } + + return fbdev_cma; + +err_drm_fb_helper_fini: + drm_fb_helper_fini(helper); +err_free: + kfree(fbdev_cma); + + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(drm_fbdev_cma_init); + +/** + * drm_fbdev_cma_fini() - Free drm_fbdev_cma struct + * @fbdev_cma: The drm_fbdev_cma struct + */ +void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma) +{ + if (fbdev_cma->fb_helper.fbdev) { + struct fb_info *info; + int ret; + + info = fbdev_cma->fb_helper.fbdev; + ret = unregister_framebuffer(info); + if (ret < 0) + DRM_DEBUG_KMS("failed unregister_framebuffer()\n"); + + if (info->cmap.len) + fb_dealloc_cmap(&info->cmap); + + framebuffer_release(info); + } + + if (fbdev_cma->fb) + drm_fb_cma_destroy(&fbdev_cma->fb->fb); + + drm_fb_helper_fini(&fbdev_cma->fb_helper); + kfree(fbdev_cma); +} +EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini); + +/** + * drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode + * @fbdev_cma: The drm_fbdev_cma struct, may be NULL + * + * This function is usually called from the DRM drivers lastclose callback. + */ +void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma) +{ + if (fbdev_cma) + drm_fb_helper_restore_fbdev_mode(&fbdev_cma->fb_helper); +} +EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode); + +/** + * drm_fbdev_cma_hotplug_event() - Poll for hotpulug events + * @fbdev_cma: The drm_fbdev_cma struct, may be NULL + * + * This function is usually called from the DRM drivers output_poll_changed + * callback. + */ +void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma) +{ + if (fbdev_cma) + drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper); +} +EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event); 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