Re: [PATCH v10 4/5] soc / drm: mediatek: Move routing control to mmsys device

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

Hi, Enric:

On Thu, 2020-02-27 at 19:08 +0100, Enric Balletbo i Serra wrote:
> Provide a mtk_mmsys_ddp_connect() and mtk_mmsys_disconnect() functions to
> replace mtk_ddp_add_comp_to_path() and mtk_ddp_remove_comp_from_path().
> Those functions will allow DRM driver and others to control the data
> path routing.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> ---
> 
> Changes in v10:
> - Introduced a new patch to move routing control into mmsys driver.
> - Removed the patch to use regmap as is not needed anymore.
> 
> Changes in v9: None
> Changes in v8: None
> Changes in v7: None
> 
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  13 +-
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c  | 256 ----------------------
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.h  |   7 -
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c  |  13 +-
>  drivers/soc/mediatek/mtk-mmsys.c        | 275 ++++++++++++++++++++++++
>  include/linux/soc/mediatek/mtk-mmsys.h  |  19 ++
>  6 files changed, 306 insertions(+), 277 deletions(-)
>  create mode 100644 include/linux/soc/mediatek/mtk-mmsys.h
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index fd4042de12f2..3c89449bea6e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -6,6 +6,7 @@
>  #include <linux/clk.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/soc/mediatek/mtk-cmdq.h>
> +#include <linux/soc/mediatek/mtk-mmsys.h>
>  
>  #include <asm/barrier.h>
>  #include <soc/mediatek/smi.h>
> @@ -296,9 +297,9 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
>  	}
>  
>  	for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) {
> -		mtk_ddp_add_comp_to_path(mtk_crtc->config_regs,
> -					 mtk_crtc->ddp_comp[i]->id,
> -					 mtk_crtc->ddp_comp[i + 1]->id);
> +		mtk_mmsys_ddp_connect(mtk_crtc->config_regs,
> +				      mtk_crtc->ddp_comp[i]->id,
> +				      mtk_crtc->ddp_comp[i + 1]->id);

When CONFIG_MTK_MMSYS is not enable, this would built fail. So make some
modification in Kconfig.

>  		mtk_disp_mutex_add_comp(mtk_crtc->mutex,
>  					mtk_crtc->ddp_comp[i]->id);
>  	}
> @@ -355,9 +356,9 @@ static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *mtk_crtc)
>  					   mtk_crtc->ddp_comp[i]->id);
>  	mtk_disp_mutex_disable(mtk_crtc->mutex);
>  	for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) {
> -		mtk_ddp_remove_comp_from_path(mtk_crtc->config_regs,
> -					      mtk_crtc->ddp_comp[i]->id,
> -					      mtk_crtc->ddp_comp[i + 1]->id);
> +		mtk_mmsys_ddp_disconnect(mtk_crtc->config_regs,
> +					 mtk_crtc->ddp_comp[i]->id,
> +					 mtk_crtc->ddp_comp[i + 1]->id);
>  		mtk_disp_mutex_remove_comp(mtk_crtc->mutex,
>  					   mtk_crtc->ddp_comp[i]->id);
>  	}
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> index b885f60f474c..014c1bbe1df2 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> @@ -13,26 +13,6 @@
>  #include "mtk_drm_ddp.h"
>  #include "mtk_drm_ddp_comp.h"
>  

[snip]

> diff --git a/include/linux/soc/mediatek/mtk-mmsys.h b/include/linux/soc/mediatek/mtk-mmsys.h
> new file mode 100644
> index 000000000000..02fd86e62a8d
> --- /dev/null
> +++ b/include/linux/soc/mediatek/mtk-mmsys.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + */
> +
> +#ifndef __MTK_MMSYS_H
> +#define __MTK_MMSYS_H
> +
> +enum mtk_ddp_comp_id;
> +
> +void mtk_mmsys_ddp_connect(void __iomem *config_regs,

I prefer the first parameter to be 'struct device *dev' which is the
device pointer of mmsys device. and mmsys driver could use this pointer
to get its register address.

Regards,
CK

> +			   enum mtk_ddp_comp_id cur,
> +			   enum mtk_ddp_comp_id next);
> +
> +void mtk_mmsys_ddp_disconnect(void __iomem *config_regs,
> +			      enum mtk_ddp_comp_id cur,
> +			      enum mtk_ddp_comp_id next);
> +
> +#endif /* __MTK_MMSYS_H */