Re: [PATCH 3/8] drm/mediatek: don't open-code drm_gem_fb_create

[CK Hu <ck.hu@mediatek.com>]

Hi, Daniel:

On Fri, 2019-11-15 at 10:21 +0100, Daniel Vetter wrote:
> Aside: There's a few other fb_create implementations which
> simply check for valid buffer format (or an approximation thereof),
> and then call drm_gem_fb_create. For atomic drivers at least we could
> walk all planes and make sure the format/modifier combo is valid,
> and remove even more code.
> 
> For non-atomic drivers that's not possible, since the format list for
> the primary buffer might be garbage (and most likely it is).
> 
> Also delete mtk_drm_fb.[hc] since it would now only contain one
> function.

Acked-by: CK Hu <ck.hu@mediatek.com>

> 
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: CK Hu <ck.hu@mediatek.com>
> Cc: Philipp Zabel <p.zabel@pengutronix.de>
> Cc: Matthias Brugger <matthias.bgg@gmail.com>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-mediatek@lists.infradead.org
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c   | 16 ++++-
>  drivers/gpu/drm/mediatek/mtk_drm_fb.c    | 92 ------------------------
>  drivers/gpu/drm/mediatek/mtk_drm_fb.h    | 13 ----
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c |  1 -
>  4 files changed, 15 insertions(+), 107 deletions(-)
>  delete mode 100644 drivers/gpu/drm/mediatek/mtk_drm_fb.c
>  delete mode 100644 drivers/gpu/drm/mediatek/mtk_drm_fb.h
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 84d14213d992..2b1c122066ea 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -16,8 +16,10 @@
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_drv.h>
>  #include <drm/drm_fb_helper.h>
> +#include <drm/drm_fourcc.h>
>  #include <drm/drm_gem.h>
>  #include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
>  #include <drm/drm_of.h>
>  #include <drm/drm_probe_helper.h>
>  #include <drm/drm_vblank.h>
> @@ -27,7 +29,6 @@
>  #include "mtk_drm_ddp.h"
>  #include "mtk_drm_ddp_comp.h"
>  #include "mtk_drm_drv.h"
> -#include "mtk_drm_fb.h"
>  #include "mtk_drm_gem.h"
>  
>  #define DRIVER_NAME "mediatek"
> @@ -115,6 +116,19 @@ static int mtk_atomic_commit(struct drm_device *drm,
>  	return 0;
>  }
>  
> +static struct drm_framebuffer *
> +mtk_drm_mode_fb_create(struct drm_device *dev,
> +		       struct drm_file *file,
> +		       const struct drm_mode_fb_cmd2 *cmd)
> +{
> +	const struct drm_format_info *info = drm_get_format_info(dev, cmd);
> +
> +	if (info->num_planes != 1)
> +		return ERR_PTR(-EINVAL);
> +
> +	return drm_gem_fb_create(dev, file, cmd);
> +}
> +
>  static const struct drm_mode_config_funcs mtk_drm_mode_config_funcs = {
>  	.fb_create = mtk_drm_mode_fb_create,
>  	.atomic_check = drm_atomic_helper_check,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.c b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> deleted file mode 100644
> index 3f230a28a2dc..000000000000
> --- a/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> +++ /dev/null
> @@ -1,92 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-only
> -/*
> - * Copyright (c) 2015 MediaTek Inc.
> - */
> -
> -#include <linux/dma-buf.h>
> -#include <linux/dma-resv.h>
> -
> -#include <drm/drm_modeset_helper.h>
> -#include <drm/drm_fb_helper.h>
> -#include <drm/drm_fourcc.h>
> -#include <drm/drm_gem.h>
> -#include <drm/drm_gem_framebuffer_helper.h>
> -
> -#include "mtk_drm_drv.h"
> -#include "mtk_drm_fb.h"
> -#include "mtk_drm_gem.h"
> -
> -static const struct drm_framebuffer_funcs mtk_drm_fb_funcs = {
> -	.create_handle = drm_gem_fb_create_handle,
> -	.destroy = drm_gem_fb_destroy,
> -};
> -
> -static struct drm_framebuffer *mtk_drm_framebuffer_init(struct drm_device *dev,
> -					const struct drm_mode_fb_cmd2 *mode,
> -					struct drm_gem_object *obj)
> -{
> -	const struct drm_format_info *info = drm_get_format_info(dev, mode);
> -	struct drm_framebuffer *fb;
> -	int ret;
> -
> -	if (info->num_planes != 1)
> -		return ERR_PTR(-EINVAL);
> -
> -	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
> -	if (!fb)
> -		return ERR_PTR(-ENOMEM);
> -
> -	drm_helper_mode_fill_fb_struct(dev, fb, mode);
> -
> -	fb->obj[0] = obj;
> -
> -	ret = drm_framebuffer_init(dev, fb, &mtk_drm_fb_funcs);
> -	if (ret) {
> -		DRM_ERROR("failed to initialize framebuffer\n");
> -		kfree(fb);
> -		return ERR_PTR(ret);
> -	}
> -
> -	return fb;
> -}
> -
> -struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
> -					       struct drm_file *file,
> -					       const struct drm_mode_fb_cmd2 *cmd)
> -{
> -	const struct drm_format_info *info = drm_get_format_info(dev, cmd);
> -	struct drm_framebuffer *fb;
> -	struct drm_gem_object *gem;
> -	unsigned int width = cmd->width;
> -	unsigned int height = cmd->height;
> -	unsigned int size, bpp;
> -	int ret;
> -
> -	if (info->num_planes != 1)
> -		return ERR_PTR(-EINVAL);
> -
> -	gem = drm_gem_object_lookup(file, cmd->handles[0]);
> -	if (!gem)
> -		return ERR_PTR(-ENOENT);
> -
> -	bpp = info->cpp[0];
> -	size = (height - 1) * cmd->pitches[0] + width * bpp;
> -	size += cmd->offsets[0];
> -
> -	if (gem->size < size) {
> -		ret = -EINVAL;
> -		goto unreference;
> -	}
> -
> -	fb = mtk_drm_framebuffer_init(dev, cmd, gem);
> -	if (IS_ERR(fb)) {
> -		ret = PTR_ERR(fb);
> -		goto unreference;
> -	}
> -
> -	return fb;
> -
> -unreference:
> -	drm_gem_object_put_unlocked(gem);
> -	return ERR_PTR(ret);
> -}
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.h b/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> deleted file mode 100644
> index eb64d26001c6..000000000000
> --- a/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> +++ /dev/null
> @@ -1,13 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0-only */
> -/*
> - * Copyright (c) 2015 MediaTek Inc.
> - */
> -
> -#ifndef MTK_DRM_FB_H
> -#define MTK_DRM_FB_H
> -
> -struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
> -					       struct drm_file *file,
> -					       const struct drm_mode_fb_cmd2 *cmd);
> -
> -#endif /* MTK_DRM_FB_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index 3b0cc91c7023..540ef2faa40a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -13,7 +13,6 @@
>  #include "mtk_drm_crtc.h"
>  #include "mtk_drm_ddp_comp.h"
>  #include "mtk_drm_drv.h"
> -#include "mtk_drm_fb.h"
>  #include "mtk_drm_gem.h"
>  #include "mtk_drm_plane.h"
>  

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