Re: [PATCH 6/9] drm/exynos: update exynos_drm_framebuffer_init() for multiple buffers

[Gustavo Padovan <gustavo@padovan.org>]

2015-09-01 Joonyoung Shim <jy0922.shim@samsung.com>:

> This modifies exynos_drm_framebuffer_init() to be possible to support
> multiple buffers. Then it can be used by exynos_user_fb_create().
> 
> Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_fb.c    | 36 +++++++++++++++++--------------
>  drivers/gpu/drm/exynos/exynos_drm_fb.h    |  5 ++++-
>  drivers/gpu/drm/exynos/exynos_drm_fbdev.c |  3 +--
>  3 files changed, 25 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fb.c b/drivers/gpu/drm/exynos/exynos_drm_fb.c
> index 5cee148..8e5d3eb 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fb.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fb.c
> @@ -23,7 +23,6 @@
>  #include "exynos_drm_drv.h"
>  #include "exynos_drm_fb.h"
>  #include "exynos_drm_fbdev.h"
> -#include "exynos_drm_gem.h"
>  #include "exynos_drm_iommu.h"
>  #include "exynos_drm_crtc.h"
>  
> @@ -134,36 +133,41 @@ unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
>  struct drm_framebuffer *
>  exynos_drm_framebuffer_init(struct drm_device *dev,
>  			    struct drm_mode_fb_cmd2 *mode_cmd,
> -			    struct drm_gem_object *obj)
> +			    struct exynos_drm_gem_obj **gem_obj,
> +			    int count)
>  {
>  	struct exynos_drm_fb *exynos_fb;
> -	struct exynos_drm_gem_obj *exynos_gem_obj;
> +	int i;
>  	int ret;
>  
> -	exynos_gem_obj = to_exynos_gem_obj(obj);
> -
> -	ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
> -	if (ret < 0)
> -		return ERR_PTR(ret);
> -
>  	exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
>  	if (!exynos_fb)
>  		return ERR_PTR(-ENOMEM);
>  
> -	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
> -	exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
> +	exynos_fb->buf_cnt = count;
> +	DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
>  
> -	/* buffer count to framebuffer always is 1 at booting time. */
> -	exynos_fb->buf_cnt = 1;
> +	for (i = 0; i < count; i++) {
> +		ret = check_fb_gem_memory_type(dev, gem_obj[i]);
> +		if (ret < 0)
> +			goto err;
> +
> +		exynos_fb->exynos_gem_obj[i] = gem_obj[i];
> +	}
> +
> +	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
>  
>  	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
> -	if (ret) {
> -		kfree(exynos_fb);
> +	if (ret < 0) {
>  		DRM_ERROR("failed to initialize framebuffer\n");
> -		return ERR_PTR(ret);
> +		goto err;
>  	}
>  
>  	return &exynos_fb->fb;
> +
> +err:
> +	kfree(exynos_fb);
> +	return ERR_PTR(ret);
>  }
>  
>  static struct drm_framebuffer *
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fb.h b/drivers/gpu/drm/exynos/exynos_drm_fb.h
> index 897d2cf..8900f6b 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fb.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fb.h
> @@ -14,10 +14,13 @@
>  #ifndef _EXYNOS_DRM_FB_H_
>  #define _EXYNOS_DRM_FB_H
>  
> +#include "exynos_drm_gem.h"
> +
>  struct drm_framebuffer *
>  exynos_drm_framebuffer_init(struct drm_device *dev,
>  			    struct drm_mode_fb_cmd2 *mode_cmd,
> -			    struct drm_gem_object *obj);
> +			    struct exynos_drm_gem_obj **gem_obj,
> +			    int count);
>  
>  /* get gem object of a drm framebuffer */
>  struct exynos_drm_gem_obj *exynos_drm_fb_gem_obj(struct drm_framebuffer *fb,
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> index 133cf5f..a221f75 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> @@ -21,7 +21,6 @@
>  #include "exynos_drm_drv.h"
>  #include "exynos_drm_fb.h"
>  #include "exynos_drm_fbdev.h"
> -#include "exynos_drm_gem.h"
>  #include "exynos_drm_iommu.h"
>  
>  #define MAX_CONNECTOR		4
> @@ -160,7 +159,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
>  
>  	exynos_fbdev->obj = obj;
>  
> -	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, &obj->base);
> +	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, &obj, 1);

Do you have any use for this for multiple buffers? I don't see any patch
in this series for multiple buffers. I think we should wait for a user
of multiple buffers to apply this patch.

	Gustavo
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