Re: [PATCH v3 05/11] drm/mediatek: Set DRM mode configs accordingly

[CK Hu (胡俊光)]

Hi, Hsiao-chien:

On Tue, 2023-10-17 at 14:47 +0800, Hsiao Chien Sung wrote:
> Set DRM mode configs limitation accroding to the
> hardware capabilities.
> 
> Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c | 28 ++++++++++++++++++----
> ----
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h | 17 ++++++++++++++++
>  2 files changed, 37 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 5d551bff6b3f..a4b740420ebb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -304,6 +304,7 @@ static const struct mtk_mmsys_driver_data
> mt8188_vdosys0_driver_data = {
>  	.conn_routes = mt8188_mtk_ddp_main_routes,
>  	.conn_routes_num = ARRAY_SIZE(mt8188_mtk_ddp_main_routes),
>  	.mmsys_dev_num = 2,
> +	.max_pitch = GENMASK(15, 0),
>  };
>  
>  static const struct mtk_mmsys_driver_data mt8192_mmsys_driver_data =
> {
> @@ -318,6 +319,7 @@ static const struct mtk_mmsys_driver_data
> mt8195_vdosys0_driver_data = {
>  	.main_path = mt8195_mtk_ddp_main,
>  	.main_len = ARRAY_SIZE(mt8195_mtk_ddp_main),
>  	.mmsys_dev_num = 2,
> +	.max_pitch = GENMASK(15, 0),
>  };
>  
>  static const struct mtk_mmsys_driver_data mt8195_vdosys1_driver_data
> = {
> @@ -325,6 +327,7 @@ static const struct mtk_mmsys_driver_data
> mt8195_vdosys1_driver_data = {
>  	.ext_len = ARRAY_SIZE(mt8195_mtk_ddp_ext),
>  	.mmsys_id = 1,
>  	.mmsys_dev_num = 2,
> +	.max_pitch = GENMASK(15, 0),
>  };
>  
>  static const struct of_device_id mtk_drm_of_ids[] = {
> @@ -463,16 +466,16 @@ static int mtk_drm_kms_init(struct drm_device
> *drm)
>  	if (ret)
>  		goto put_mutex_dev;
>  
> -	drm->mode_config.min_width = 64;
> -	drm->mode_config.min_height = 64;
> -
>  	/*
> -	 * set max width and height as default value(4096x4096).
> -	 * this value would be used to check framebuffer size
> limitation
> -	 * at drm_mode_addfb().
> +	 * Set default values for drm mode config
> +	 * these values will be referenced by drm_mode_addfb() as
> +	 * frame buffer size limitation.
>  	 */
> -	drm->mode_config.max_width = 4096;
> -	drm->mode_config.max_height = 4096;
> +	drm->mode_config.min_width = 1;
> +	drm->mode_config.min_height = 1;
> +	drm->mode_config.cursor_width = 512;
> +	drm->mode_config.cursor_height = 512;

You change this for mt8173 and mt8183. Are you sure this is correct?

Regards,
CK

> +
>  	drm->mode_config.funcs = &mtk_drm_mode_config_funcs;
>  	drm->mode_config.helper_private = &mtk_drm_mode_config_helpers;
>  
> @@ -502,6 +505,15 @@ static int mtk_drm_kms_init(struct drm_device
> *drm)
>  		for (j = 0; j < private->data->mmsys_dev_num; j++) {
>  			priv_n = private->all_drm_private[j];
>  
> +			if (priv_n->data->max_pitch) {
> +				/* Save 4 bytes for the color depth
> (pitch = width x bpp) */
> +				drm->mode_config.max_width  = priv_n-
> >data->max_pitch >> 2;
> +				drm->mode_config.max_height = priv_n-
> >data->max_pitch >> 2;
> +			} else {
> +				drm->mode_config.max_width = 4096;
> +				drm->mode_config.max_height = 4096;
> +			}
> +
>  			if (i == 0 && priv_n->data->main_len) {
>  				ret = mtk_drm_crtc_create(drm, priv_n-
> >data->main_path,
>  							  priv_n->data-
> >main_len, j,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index d2efd715699f..833ecee855bb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -28,6 +28,21 @@ struct mtk_drm_route {
>  	const unsigned int *route_ddp;
>  };
>  
> +/**
> + * struct mtk_mmsys_driver_data - capabilities for the mmsys
> + * @main_path: path of the main display
> + * @main_len: length of the main display path
> + * @ext_path: path of the external display
> + * @ext_len: length of the external display path
> + * @third_path: path of the third display
> + * @third_len: length of the third display path
> + * @conn_routes: routing table of all the possible connectors
> + * @conn_routes_num: number of the routing table for the connectors
> + * @shadow_register: whether or not shadow register is enabled
> + * @mmsys_id: multi-media system ID
> + * @mmsys_dev_num: number of devices for in the mmsys as a whole
> + * @max_pitch: maximum pitch in bytes that the mmsys supports
> + */
>  struct mtk_mmsys_driver_data {
>  	const unsigned int *main_path;
>  	unsigned int main_len;
> @@ -41,6 +56,8 @@ struct mtk_mmsys_driver_data {
>  	bool shadow_register;
>  	unsigned int mmsys_id;
>  	unsigned int mmsys_dev_num;
> +
> +	u32 max_pitch;
>  };
>  
>  struct mtk_drm_private {