Add fbdev support to the Mediatek DRM driver.
Signed-off-by: CK Hu ck.hu@mediatek.com Signed-off-by: YT Shen yt.shen@mediatek.com Signed-off-by: Philipp Zabel p.zabel@pengutronix.de Signed-off-by: Daniel Kurtz djkurtz@chromium.org [uli: Forward-ported from chromeos-3.18 vendor kernel.] Signed-off-by: Ulrich Hecht ulrich.hecht+renesas@gmail.com --- drivers/gpu/drm/mediatek/Makefile | 2 + drivers/gpu/drm/mediatek/mtk_drm_drv.c | 8 ++ drivers/gpu/drm/mediatek/mtk_drm_drv.h | 4 +- drivers/gpu/drm/mediatek/mtk_drm_fb.c | 13 +++ drivers/gpu/drm/mediatek/mtk_drm_fb.h | 3 + drivers/gpu/drm/mediatek/mtk_drm_fbdev.c | 181 +++++++++++++++++++++++++++++++ drivers/gpu/drm/mediatek/mtk_drm_fbdev.h | 32 ++++++ 7 files changed, 242 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_fbdev.c create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_fbdev.h
diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile index e37b55a..8306fb5 100644 --- a/drivers/gpu/drm/mediatek/Makefile +++ b/drivers/gpu/drm/mediatek/Makefile @@ -12,6 +12,8 @@ mediatek-drm-y := mtk_disp_color.o \ mtk_mipi_tx.o \ mtk_dpi.o
+mediatek-drm-$(CONFIG_DRM_FBDEV_EMULATION) += mtk_drm_fbdev.o + obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o
mediatek-drm-hdmi-objs := mtk_cec.o \ diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index ce99921..636b8db 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -30,6 +30,7 @@ #include "mtk_drm_ddp_comp.h" #include "mtk_drm_drv.h" #include "mtk_drm_fb.h" +#include "mtk_drm_fbdev.h" #include "mtk_drm_gem.h"
#define DRIVER_NAME "mediatek" @@ -257,8 +258,14 @@ static int mtk_drm_kms_init(struct drm_device *drm) drm_kms_helper_poll_init(drm); drm_mode_config_reset(drm);
+ ret = mtk_fbdev_init(drm); + if (ret) + goto err_kms_helper_poll_fini; + return 0;
+err_kms_helper_poll_fini: + drm_kms_helper_poll_fini(drm); err_component_unbind: component_unbind_all(drm->dev, drm); err_config_cleanup: @@ -269,6 +276,7 @@ static int mtk_drm_kms_init(struct drm_device *drm)
static void mtk_drm_kms_deinit(struct drm_device *drm) { + mtk_fbdev_fini(drm); drm_kms_helper_poll_fini(drm);
component_unbind_all(drm->dev, drm); diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h index c3378c4..4edc002 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h @@ -14,6 +14,7 @@ #ifndef MTK_DRM_DRV_H #define MTK_DRM_DRV_H
+#include <drm/drm_fb_helper.h> #include <linux/io.h> #include "mtk_drm_ddp_comp.h"
@@ -24,7 +25,6 @@ struct device; struct device_node; struct drm_crtc; struct drm_device; -struct drm_fb_helper; struct drm_property; struct regmap;
@@ -56,6 +56,8 @@ struct mtk_drm_private { } commit;
struct drm_atomic_state *suspend_state; + struct drm_fb_helper fb_helper; + struct drm_gem_object *fbdev_bo; };
extern struct platform_driver mtk_ddp_driver; diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.c b/drivers/gpu/drm/mediatek/mtk_drm_fb.c index 0d8d506..ac8561d 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_fb.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.c @@ -96,6 +96,19 @@ static struct mtk_drm_fb *mtk_drm_framebuffer_init(struct drm_device *dev, return mtk_fb; }
+struct drm_framebuffer *mtk_drm_framebuffer_create(struct drm_device *dev, + const struct drm_mode_fb_cmd2 *mode, + struct drm_gem_object *obj) +{ + struct mtk_drm_fb *mtk_fb; + + mtk_fb = mtk_drm_framebuffer_init(dev, mode, obj); + if (IS_ERR(mtk_fb)) + return ERR_CAST(mtk_fb); + + return &mtk_fb->base; +} + /* * Wait for any exclusive fence in fb's gem object's reservation object. * diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.h b/drivers/gpu/drm/mediatek/mtk_drm_fb.h index 9b2ae34..9ee1ac2 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_fb.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.h @@ -19,5 +19,8 @@ int mtk_fb_wait(struct drm_framebuffer *fb); struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev, struct drm_file *file, const struct drm_mode_fb_cmd2 *cmd); +struct drm_framebuffer *mtk_drm_framebuffer_create(struct drm_device *dev, + const struct drm_mode_fb_cmd2 *mode, + struct drm_gem_object *obj);
#endif /* MTK_DRM_FB_H */ diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fbdev.c b/drivers/gpu/drm/mediatek/mtk_drm_fbdev.c new file mode 100644 index 0000000..9193647 --- /dev/null +++ b/drivers/gpu/drm/mediatek/mtk_drm_fbdev.c @@ -0,0 +1,181 @@ +/* + * Copyright (c) 2016 MediaTek Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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_helper.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_gem.h> + +#include "mtk_drm_drv.h" +#include "mtk_drm_fb.h" +#include "mtk_drm_gem.h" + +#define to_drm_private(x) \ + container_of(x, struct mtk_drm_private, fb_helper) + +#if 1 +static int mtk_drm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + struct drm_fb_helper *helper = info->par; + struct mtk_drm_private *private = helper->dev->dev_private; + + return mtk_drm_gem_mmap_buf(private->fbdev_bo, vma); +} +#endif + +static struct fb_ops mtk_fbdev_ops = { + .owner = THIS_MODULE, + .fb_fillrect = drm_fb_helper_cfb_fillrect, + .fb_copyarea = drm_fb_helper_cfb_copyarea, + .fb_imageblit = drm_fb_helper_cfb_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, + .fb_mmap = mtk_drm_fbdev_mmap, +}; + +static int mtk_fbdev_probe(struct drm_fb_helper *helper, + struct drm_fb_helper_surface_size *sizes) +{ + struct drm_device *dev = helper->dev; + struct mtk_drm_private *private = helper->dev->dev_private; + struct drm_mode_fb_cmd2 mode = { 0 }; + struct mtk_drm_gem_obj *mtk_gem; + struct fb_info *info; + struct drm_framebuffer *fb; + unsigned int bytes_per_pixel; + unsigned long offset; + size_t size; + int err; + + bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8); + + mode.width = sizes->surface_width; + mode.height = sizes->surface_height; + mode.pitches[0] = sizes->surface_width * bytes_per_pixel; + mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, + sizes->surface_depth); + + size = mode.pitches[0] * mode.height; + + mtk_gem = mtk_drm_gem_create(dev, size, true); + if (IS_ERR(mtk_gem)) + return PTR_ERR(mtk_gem); + + private->fbdev_bo = &mtk_gem->base; + + info = drm_fb_helper_alloc_fbi(helper); + if (IS_ERR(info)) { + err = PTR_ERR(info); + dev_err(dev->dev, "failed to allocate framebuffer info, %d\n", + err); + goto err_gem_free_object; + } + + fb = mtk_drm_framebuffer_create(dev, &mode, private->fbdev_bo); + if (IS_ERR(fb)) { + err = PTR_ERR(fb); + dev_err(dev->dev, "failed to allocate DRM framebuffer, %d\n", + err); + goto err_release_fbi; + } + helper->fb = fb; + + info->par = helper; + info->flags = FBINFO_FLAG_DEFAULT; + info->fbops = &mtk_fbdev_ops; + + drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth); + drm_fb_helper_fill_var(info, helper, sizes->fb_width, sizes->fb_height); + + offset = info->var.xoffset * bytes_per_pixel; + offset += info->var.yoffset * fb->pitches[0]; + + dev->mode_config.fb_base = 0; + info->screen_base = mtk_gem->kvaddr + offset; + info->screen_size = size; + info->fix.smem_len = size; + + DRM_DEBUG_KMS("FB [%ux%u]-%u offset=%lu size=%zd\n", + fb->width, fb->height, fb->format->depth, offset, size); + + info->skip_vt_switch = true; + + return 0; + +err_release_fbi: +err_gem_free_object: + mtk_drm_gem_free_object(&mtk_gem->base); + return err; +} + +static const struct drm_fb_helper_funcs mtk_drm_fb_helper_funcs = { + .fb_probe = mtk_fbdev_probe, +}; + +int mtk_fbdev_init(struct drm_device *dev) +{ + struct mtk_drm_private *priv = dev->dev_private; + struct drm_fb_helper *helper = &priv->fb_helper; + int ret; + + if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) + return -EINVAL; + + drm_fb_helper_prepare(dev, helper, &mtk_drm_fb_helper_funcs); + + ret = drm_fb_helper_init(dev, helper, + dev->mode_config.num_connector); + if (ret) { + dev_err(dev->dev, "failed to initialize DRM FB helper, %d\n", + ret); + goto fini; + } + + ret = drm_fb_helper_single_add_all_connectors(helper); + if (ret) { + dev_err(dev->dev, "failed to add connectors, %d\n", ret); + goto fini; + } + + ret = drm_fb_helper_initial_config(helper, 32); + if (ret) { + dev_err(dev->dev, "failed to set initial configuration, %d\n", + ret); + goto fini; + } + + return 0; + +fini: + drm_fb_helper_fini(helper); + + return ret; +} + +void mtk_fbdev_fini(struct drm_device *dev) +{ + struct mtk_drm_private *priv = dev->dev_private; + struct drm_fb_helper *helper = &priv->fb_helper; + + drm_fb_helper_unregister_fbi(helper); + + if (helper->fb) { + drm_framebuffer_unregister_private(helper->fb); + drm_framebuffer_remove(helper->fb); + } + + drm_fb_helper_fini(helper); +} diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fbdev.h b/drivers/gpu/drm/mediatek/mtk_drm_fbdev.h new file mode 100644 index 0000000..f3e0949 --- /dev/null +++ b/drivers/gpu/drm/mediatek/mtk_drm_fbdev.h @@ -0,0 +1,32 @@ +/* + * Copyright (c) 2016 MediaTek Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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. + */ + +#ifndef MTK_DRM_FBDEV_H +#define MTK_DRM_FBDEV_H + +#ifdef CONFIG_DRM_FBDEV_EMULATION +int mtk_fbdev_init(struct drm_device *dev); +void mtk_fbdev_fini(struct drm_device *dev); +#else +int mtk_fbdev_init(struct drm_device *dev) +{ + return 0; +} + +void mtk_fbdev_fini(struct drm_device *dev) +{ + +} +#endif /* CONFIG_DRM_FBDEV_EMULATION */ + +#endif /* MTK_DRM_FBDEV_H */