linux-kernel - Re: [PATCH v6 04/14] drm/mediatek: Add DRM_MODE_ROTATE

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Date: Fri, 22 Mar 2024 09:02:58 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: Shawn Sung (宋孝謙) <Shawn.Sung@...iatek.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
CC: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bibby Hsieh (謝濟遠) <Bibby.Hsieh@...iatek.com>,
	"jason-ch.chen@...iatek.corp-partner.google.com"
	<jason-ch.chen@...iatek.corp-partner.google.com>,
	Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
	"daniel@...ll.ch" <daniel@...ll.ch>, "p.zabel@...gutronix.de"
	<p.zabel@...gutronix.de>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "airlied@...il.com" <airlied@...il.com>,
	"sean@...rly.run" <sean@...rly.run>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "fshao@...omium.org" <fshao@...omium.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 04/14] drm/mediatek: Add DRM_MODE_ROTATE_0 to rotation
 property

Hi, Shawn:

On Fri, 2024-03-22 at 13:28 +0800, Shawn Sung wrote:
> From: Hsiao Chien Sung <shawn.sung@...iatek.com>
> 
> Always add DRM_MODE_ROTATE_0 to rotation property to meet
> IGT's (Intel GPU Tools) requirement.

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

> 
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_ddp_comp.h |  6 +++++-
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 21 +++++++++------------
>  drivers/gpu/drm/mediatek/mtk_plane.c    |  2 +-
>  3 files changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
> b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
> index 26236691ce4c2..f7fe2e08dc8e2 100644
> --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
> @@ -192,7 +192,11 @@ unsigned int
> mtk_ddp_comp_supported_rotations(struct mtk_ddp_comp *comp)
>  	if (comp->funcs && comp->funcs->supported_rotations)
>  		return comp->funcs->supported_rotations(comp->dev);
>  
> -	return 0;
> +	/*
> +	 * In order to pass IGT tests, DRM_MODE_ROTATE_0 is required
> when
> +	 * rotation is not supported.
> +	 */
> +	return DRM_MODE_ROTATE_0;
>  }
>  
>  static inline unsigned int mtk_ddp_comp_layer_nr(struct mtk_ddp_comp
> *comp)
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index 0ebeaf9830d83..2a767a823c83a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -288,6 +288,10 @@ unsigned int mtk_ovl_layer_nr(struct device
> *dev)
>  
>  unsigned int mtk_ovl_supported_rotations(struct device *dev)
>  {
> +	/*
> +	 * although currently OVL can only do reflection,
> +	 * reflect x + reflect y = rotate 180
> +	 */
>  	return DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180 |
>  	       DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y;
>  }
> @@ -296,27 +300,20 @@ int mtk_ovl_layer_check(struct device *dev,
> unsigned int idx,
>  			struct mtk_plane_state *mtk_state)
>  {
>  	struct drm_plane_state *state = &mtk_state->base;
> -	unsigned int rotation = 0;
>  
> -	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)
> +	/* check if any unsupported rotation is set */
> +	if (state->rotation & ~mtk_ovl_supported_rotations(dev))
>  		return -EINVAL;
>  
>  	/*
>  	 * TODO: Rotating/reflecting YUV buffers is not supported at
> this time.
>  	 *	 Only RGB[AX] variants are supported.
> +	 *	 Since DRM_MODE_ROTATE_0 means "no rotation", we
> should not
> +	 *	 reject layers with this property.
>  	 */
> -	if (state->fb->format->is_yuv && rotation != 0)
> +	if (state->fb->format->is_yuv && (state->rotation &
> ~DRM_MODE_ROTATE_0))
>  		return -EINVAL;
>  
> -	state->rotation = rotation;
> -
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/mediatek/mtk_plane.c
> b/drivers/gpu/drm/mediatek/mtk_plane.c
> index a74b26d359857..1723d4333f371 100644
> --- a/drivers/gpu/drm/mediatek/mtk_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_plane.c
> @@ -338,7 +338,7 @@ int mtk_plane_init(struct drm_device *dev, struct
> drm_plane *plane,
>  		return err;
>  	}
>  
> -	if (supported_rotations & ~DRM_MODE_ROTATE_0) {
> +	if (supported_rotations) {
>  		err = drm_plane_create_rotation_property(plane,
>  							 DRM_MODE_ROTAT
> E_0,
>  							 supported_rota
> tions);