Re: [PATCH 44/59] drm/mediatek: Use drm_atomic_helper_wait_for_fences

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

Hi, Daniel:

On Fri, 2019-06-14 at 22:36 +0200, Daniel Vetter wrote:
> If we use the gem fb helper as the prepare_fb hook, plus the
> drm_prime.c import helpers now automatically setting obj->resv, we can
> use the shared helpers to wait for fences instead of rolling our own.
> Note that this relies on mtk setting drm_fb->obj, which is already
> done in mtk_drm_framebuffer_init().

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

> 
> Aside: Probably can use the default commit_tail with this again, but I
> didn't check for that.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> 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   | 12 +---------
>  drivers/gpu/drm/mediatek/mtk_drm_fb.c    | 28 ------------------------
>  drivers/gpu/drm/mediatek/mtk_drm_fb.h    |  1 -
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c |  2 ++
>  4 files changed, 3 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index dd8dab562500..2d5caf532431 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -38,22 +38,12 @@ static void mtk_atomic_schedule(struct mtk_drm_private *private,
>  	schedule_work(&private->commit.work);
>  }
>  
> -static void mtk_atomic_wait_for_fences(struct drm_atomic_state *state)
> -{
> -	struct drm_plane *plane;
> -	struct drm_plane_state *new_plane_state;
> -	int i;
> -
> -	for_each_new_plane_in_state(state, plane, new_plane_state, i)
> -		mtk_fb_wait(new_plane_state->fb);
> -}
> -
>  static void mtk_atomic_complete(struct mtk_drm_private *private,
>  				struct drm_atomic_state *state)
>  {
>  	struct drm_device *drm = private->drm;
>  
> -	mtk_atomic_wait_for_fences(state);
> +	drm_atomic_helper_wait_for_fences(drm, state, false);
>  
>  	/*
>  	 * Mediatek drm supports runtime PM, so plane registers cannot be
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.c b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> index 4c3ad7de2d3b..396ba497986d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> @@ -49,34 +49,6 @@ static struct drm_framebuffer *mtk_drm_framebuffer_init(struct drm_device *dev,
>  	return fb;
>  }
>  
> -/*
> - * Wait for any exclusive fence in fb's gem object's reservation object.
> - *
> - * Returns -ERESTARTSYS if interrupted, else 0.
> - */
> -int mtk_fb_wait(struct drm_framebuffer *fb)
> -{
> -	struct drm_gem_object *gem;
> -	struct reservation_object *resv;
> -	long ret;
> -
> -	if (!fb)
> -		return 0;
> -
> -	gem = fb->obj[0];
> -	if (!gem || !gem->dma_buf || !gem->dma_buf->resv)
> -		return 0;
> -
> -	resv = gem->dma_buf->resv;
> -	ret = reservation_object_wait_timeout_rcu(resv, false, true,
> -						  MAX_SCHEDULE_TIMEOUT);
> -	/* MAX_SCHEDULE_TIMEOUT on success, -ERESTARTSYS if interrupted */
> -	if (WARN_ON(ret < 0))
> -		return ret;
> -
> -	return 0;
> -}
> -
>  struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
>  					       struct drm_file *file,
>  					       const struct drm_mode_fb_cmd2 *cmd)
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.h b/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> index 6b80c28e33cf..eb64d26001c6 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> @@ -6,7 +6,6 @@
>  #ifndef MTK_DRM_FB_H
>  #define MTK_DRM_FB_H
>  
> -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);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index f2ef83aed6f9..42cc9823eaaa 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -8,6 +8,7 @@
>  #include <drm/drm_atomic.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_plane_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
>  
>  #include "mtk_drm_crtc.h"
>  #include "mtk_drm_ddp_comp.h"
> @@ -146,6 +147,7 @@ static void mtk_plane_atomic_disable(struct drm_plane *plane,
>  }
>  
>  static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
> +	.prepare_fb = drm_gem_fb_prepare_fb,
>  	.atomic_check = mtk_plane_atomic_check,
>  	.atomic_update = mtk_plane_atomic_update,
>  	.atomic_disable = mtk_plane_atomic_disable,


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