Re: [PATCH v4 1/1] drm/mediatek: Fix errors when reporting rotation capability

[CK Hu (胡俊光)]

Hi, Hsiao-chien:

On Fri, 2023-11-24 at 18:00 +0800, Hsiao Chien Sung wrote:
> Create rotation property according to the hardware capability.
> Since currently OVL of all chips support same rotation,
> no need to define it in the driver data.
> 
> Fixes: 84d805753983 ("drm/mediatek: Support reflect-y plane
> rotation")
> 
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@xxxxxxxxxxxxx>
> Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_drv.h        |  1 +
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c        | 18 ++++++--------
> ----
>  .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c    |  9 +++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c    |  1 +
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c       |  2 +-
>  5 files changed, 18 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index 4d6e8b667bc3..c5afeb7c5527 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -127,6 +127,7 @@ void mtk_ovl_adaptor_register_vblank_cb(struct
> device *dev, void (*vblank_cb)(vo
>  void mtk_ovl_adaptor_unregister_vblank_cb(struct device *dev);
>  void mtk_ovl_adaptor_enable_vblank(struct device *dev);
>  void mtk_ovl_adaptor_disable_vblank(struct device *dev);
> +unsigned int mtk_ovl_adaptor_supported_rotations(struct device
> *dev);
>  void mtk_ovl_adaptor_start(struct device *dev);
>  void mtk_ovl_adaptor_stop(struct device *dev);
>  unsigned int mtk_ovl_adaptor_layer_nr(struct device *dev);
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index ecc38932fd44..319bbfde5cf9 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -415,6 +415,10 @@ 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;
>  }
> @@ -423,27 +427,17 @@ 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)
> +	if (state->rotation & ~mtk_ovl_supported_rotations(dev))
>  		return -EINVAL;

The commit message of this patch is "Create rotation property according
to the hardware capability". I think this modification is not related
to create property, so separate this to another patch.

> 
>  	/*
>  	 * TODO: Rotating/reflecting YUV buffers is not supported at
> this time.
>  	 *	 Only RGB[AX] variants are supported.
>  	 */
> -	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_disp_ovl_adaptor.c
> b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> index 4398db9a6276..273c79d37bef 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> @@ -383,6 +383,15 @@ void mtk_ovl_adaptor_register_vblank_cb(struct
> device *dev, void (*vblank_cb)(vo
>  				     vblank_cb, vblank_cb_data);
>  }
> 
> +unsigned int mtk_ovl_adaptor_supported_rotations(struct device *dev)
> +{
> +	/*
> +	 * should still return DRM_MODE_ROTATE_0 if rotation is not
> supported,
> +	 * or IGT will fail.
> +	 */
> +	return DRM_MODE_ROTATE_0;
> +}
> +
>  void mtk_ovl_adaptor_unregister_vblank_cb(struct device *dev)
>  {
>  	struct mtk_disp_ovl_adaptor *ovl_adaptor =
> dev_get_drvdata(dev);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index ffa4868b1222..206dd6f6f99e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -422,6 +422,7 @@ static const struct mtk_ddp_comp_funcs
> ddp_ovl_adaptor = {
>  	.remove = mtk_ovl_adaptor_remove_comp,
>  	.get_formats = mtk_ovl_adaptor_get_formats,
>  	.get_num_formats = mtk_ovl_adaptor_get_num_formats,
> +	.supported_rotations = mtk_ovl_adaptor_supported_rotations,
>  };
> 
>  static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] =
> {
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index e2ec61b69618..894c39a38a58 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -344,7 +344,7 @@ int mtk_plane_init(struct drm_device *dev, struct
> drm_plane *plane,
>  		return err;
>  	}
> 
> -	if (supported_rotations & ~DRM_MODE_ROTATE_0) {
> +	if (supported_rotations) {

Why need this modification?
Before Sean's patch [1], only support rotate 0 and does not create
property and it works. Why does it must create property for only
support rotate 0?


[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/mediatek/mtk_drm_plane.c?h=v6.7-rc6&id=ef87d3e2dd251374c5c9fa3b6502aeff8fe29da9

Regards,
CK

>  		err = drm_plane_create_rotation_property(plane,
>  							 DRM_MODE_ROTAT
> E_0,
>  							 supported_rota
> tions);
> --
> 2.39.2
>