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Date:   Mon, 25 Oct 2021 21:11:54 -0400
From:   Sean Paul <sean@...rly.run>
To:     Mark Yacoub <markyacoub@...omium.org>
Cc:     linux-mediatek@...ts.infradead.org, seanpaul@...omium.org,
        Mark Yacoub <markyacoub@...gle.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/mediatek: Set Rotation default value to 1.

On Fri, Oct 22, 2021 at 12:54:02PM -0400, Mark Yacoub wrote:
> From: Mark Yacoub <markyacoub@...gle.com>
> 
> [Why]
> The Rotation prob is a bitmask value. It must always have a valid value.

nit: s/prob/prop/

> A default NO rotation is equal to 1 not 0.
> 
> [How]
> 1. At the reset hook, call __drm_atomic_helper_plane_reset which is
> called at the initialization of the plane and sets the default value of
> all planes to DRM_MODE_ROTATE_0 which is equal to 1.
> 2. At the ovl layer check, do no overwrite the state->rotation value 0
> if DRM_MODE_ROTATE_0 is set. We should not change the value that the
> userspace has set, especially if it's an unsupported value.

nit: I would probably split these into 2 patches since they're related but
different

Sean

> 
> Tested on Jacuzzi(MTK).
> Fixes IGT@..._properties@...ne-properties-{legacy,atomic} and
> IGT@..._properties@..._properties-sanity-{atomic,non-atomic}
> 
> Signed-off-by: Mark Yacoub <markyacoub@...omium.org>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_drv.h     |  2 +-
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c     | 20 +++++++-------------
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  5 ++---
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c    |  3 ++-
>  4 files changed, 12 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index 86c3068894b11..2fc566964f68e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -64,7 +64,7 @@ void mtk_ovl_config(struct device *dev, unsigned int w,
>  		    unsigned int h, unsigned int vrefresh,
>  		    unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
>  int mtk_ovl_layer_check(struct device *dev, unsigned int idx,
> -			struct mtk_plane_state *mtk_state);
> +			const struct mtk_plane_state *mtk_state);
>  void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
>  			  struct mtk_plane_state *state,
>  			  struct cmdq_pkt *cmdq_pkt);
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index ea5760f856ec6..13999564304bc 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -190,19 +190,15 @@ unsigned int mtk_ovl_supported_rotations(struct device *dev)
>  }
>  
>  int mtk_ovl_layer_check(struct device *dev, unsigned int idx,
> -			struct mtk_plane_state *mtk_state)
> +			const struct mtk_plane_state *mtk_state)
>  {
> -	struct drm_plane_state *state = &mtk_state->base;
> -	unsigned int rotation = 0;
> +	const struct drm_plane_state *state = &mtk_state->base;
> +	unsigned int rotation = drm_rotation_simplify(
> +		state->rotation,
> +		DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y);
>  
> -	rotation = drm_rotation_simplify(state->rotation,
> -					 DRM_MODE_ROTATE_0 |
> -					 DRM_MODE_REFLECT_X |
> -					 DRM_MODE_REFLECT_Y);
> -	rotation &= ~DRM_MODE_ROTATE_0;
> -
> -	/* We can only do reflection, not rotation */
> -	if ((rotation & DRM_MODE_ROTATE_MASK) != 0)
> +	/* We can only do reflection, not non-zero rotation */
> +	if (((rotation & ~DRM_MODE_ROTATE_0) & DRM_MODE_ROTATE_MASK) != 0)
>  		return -EINVAL;
>  
>  	/*
> @@ -212,8 +208,6 @@ int mtk_ovl_layer_check(struct device *dev, unsigned int idx,
>  	if (state->fb->format->is_yuv && rotation != 0)
>  		return -EINVAL;
>  
> -	state->rotation = rotation;
> -
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index 1b582262b682b..530bdd031933f 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -53,9 +53,8 @@ struct mtk_ddp_comp_funcs {
>  	void (*disable_vblank)(struct device *dev);
>  	unsigned int (*supported_rotations)(struct device *dev);
>  	unsigned int (*layer_nr)(struct device *dev);
> -	int (*layer_check)(struct device *dev,
> -			   unsigned int idx,
> -			   struct mtk_plane_state *state);
> +	int (*layer_check)(struct device *dev, unsigned int idx,
> +			   const struct mtk_plane_state *state);
>  	void (*layer_config)(struct device *dev, unsigned int idx,
>  			     struct mtk_plane_state *state,
>  			     struct cmdq_pkt *cmdq_pkt);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index e6dcb34d30522..accd26481b9fb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -44,9 +44,10 @@ static void mtk_plane_reset(struct drm_plane *plane)
>  		state = kzalloc(sizeof(*state), GFP_KERNEL);
>  		if (!state)
>  			return;
> -		plane->state = &state->base;
>  	}
>  
> +	__drm_atomic_helper_plane_reset(plane, &state->base);
> +
>  	state->base.plane = plane;
>  	state->pending.format = DRM_FORMAT_RGB565;
>  }
> -- 
> 2.33.0.1079.g6e70778dc9-goog
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS

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