Re: [PATCH v1 2/6] drm/mediatek: use DRM core's atomic commit helper

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

Hi, Bibby:

On Thu, 2019-11-28 at 10:42 +0800, Bibby Hsieh wrote:
> The DRM core atomic helper now supports asynchronous commits natively.
> The custom drm implementation isn't needed anymore, remove it.

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

Regards,
CK

> 
> Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c | 86 ++------------------------
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h |  7 ---
>  2 files changed, 5 insertions(+), 88 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 6588dc6dd5e3..16e5771d182e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -36,89 +36,14 @@
>  #define DRIVER_MAJOR 1
>  #define DRIVER_MINOR 0
>  
> -static void mtk_atomic_schedule(struct mtk_drm_private *private,
> -				struct drm_atomic_state *state)
> -{
> -	private->commit.state = state;
> -	schedule_work(&private->commit.work);
> -}
> -
> -static void mtk_atomic_complete(struct mtk_drm_private *private,
> -				struct drm_atomic_state *state)
> -{
> -	struct drm_device *drm = private->drm;
> -
> -	drm_atomic_helper_wait_for_fences(drm, state, false);
> -
> -	/*
> -	 * Mediatek drm supports runtime PM, so plane registers cannot be
> -	 * written when their crtc is disabled.
> -	 *
> -	 * The comment for drm_atomic_helper_commit states:
> -	 *     For drivers supporting runtime PM the recommended sequence is
> -	 *
> -	 *     drm_atomic_helper_commit_modeset_disables(dev, state);
> -	 *     drm_atomic_helper_commit_modeset_enables(dev, state);
> -	 *     drm_atomic_helper_commit_planes(dev, state,
> -	 *                                     DRM_PLANE_COMMIT_ACTIVE_ONLY);
> -	 *
> -	 * See the kerneldoc entries for these three functions for more details.
> -	 */
> -	drm_atomic_helper_commit_modeset_disables(drm, state);
> -	drm_atomic_helper_commit_modeset_enables(drm, state);
> -	drm_atomic_helper_commit_planes(drm, state,
> -					DRM_PLANE_COMMIT_ACTIVE_ONLY);
> -
> -	drm_atomic_helper_wait_for_vblanks(drm, state);
> -
> -	drm_atomic_helper_cleanup_planes(drm, state);
> -	drm_atomic_state_put(state);
> -}
> -
> -static void mtk_atomic_work(struct work_struct *work)
> -{
> -	struct mtk_drm_private *private = container_of(work,
> -			struct mtk_drm_private, commit.work);
> -
> -	mtk_atomic_complete(private, private->commit.state);
> -}
> -
> -static int mtk_atomic_commit(struct drm_device *drm,
> -			     struct drm_atomic_state *state,
> -			     bool async)
> -{
> -	struct mtk_drm_private *private = drm->dev_private;
> -	int ret;
> -
> -	ret = drm_atomic_helper_prepare_planes(drm, state);
> -	if (ret)
> -		return ret;
> -
> -	mutex_lock(&private->commit.lock);
> -	flush_work(&private->commit.work);
> -
> -	ret = drm_atomic_helper_swap_state(state, true);
> -	if (ret) {
> -		mutex_unlock(&private->commit.lock);
> -		drm_atomic_helper_cleanup_planes(drm, state);
> -		return ret;
> -	}
> -
> -	drm_atomic_state_get(state);
> -	if (async)
> -		mtk_atomic_schedule(private, state);
> -	else
> -		mtk_atomic_complete(private, state);
> -
> -	mutex_unlock(&private->commit.lock);
> -
> -	return 0;
> -}
> +static const struct drm_mode_config_helper_funcs mtk_drm_mode_config_helpers = {
> +	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
> +};
>  
>  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,
> -	.atomic_commit = mtk_atomic_commit,
> +	.atomic_commit = drm_atomic_helper_commit,
>  };
>  
>  static const enum mtk_ddp_comp_id mt2701_mtk_ddp_main[] = {
> @@ -265,6 +190,7 @@ static int mtk_drm_kms_init(struct drm_device *drm)
>  	drm->mode_config.max_width = 4096;
>  	drm->mode_config.max_height = 4096;
>  	drm->mode_config.funcs = &mtk_drm_mode_config_funcs;
> +	drm->mode_config.helper_private = &mtk_drm_mode_config_helpers;
>  
>  	ret = component_bind_all(drm->dev, drm);
>  	if (ret)
> @@ -540,8 +466,6 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  	if (!private)
>  		return -ENOMEM;
>  
> -	mutex_init(&private->commit.lock);
> -	INIT_WORK(&private->commit.work, mtk_atomic_work);
>  	private->data = of_device_get_match_data(dev);
>  
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index b6a82728d563..9f4ce60174f6 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -46,13 +46,6 @@ struct mtk_drm_private {
>  	struct device_node *comp_node[DDP_COMPONENT_ID_MAX];
>  	struct mtk_ddp_comp *ddp_comp[DDP_COMPONENT_ID_MAX];
>  	const struct mtk_mmsys_driver_data *data;
> -
> -	struct {
> -		struct drm_atomic_state *state;
> -		struct work_struct work;
> -		struct mutex lock;
> -	} commit;
> -
>  	struct drm_atomic_state *suspend_state;
>  
>  	bool dma_parms_allocated;