linux-kernel - Re: [PATCH v5 09/16] soc: mediatek: mmsys: modify reset controller for MT8195 vdosys1

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Message-ID: <d93c6866fb8a6e9bebf3b3ed6959e2c3abaf647d.camel@pengutronix.de>
Date:   Mon, 06 Sep 2021 09:29:14 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     "Nancy.Lin" <nancy.lin@...iatek.com>, CK Hu <ck.hu@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "jason-jh . lin" <jason-jh.lin@...iatek.com>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        singo.chang@...iatek.com, srv_heupstream@...iatek.com
Subject: Re: [PATCH v5 09/16] soc: mediatek: mmsys: modify reset controller
 for MT8195 vdosys1

Hi Nancy,

On Mon, 2021-09-06 at 15:15 +0800, Nancy.Lin wrote:
> MT8195 vdosys1 has more than 32 reset bits and a different reset base
> than other chips. Modify mmsys for support 64 bit and different reset
> base.
> 
> Signed-off-by: Nancy.Lin <nancy.lin@...iatek.com>
> ---
>  drivers/soc/mediatek/mt8195-mmsys.h |  1 +
>  drivers/soc/mediatek/mtk-mmsys.c    | 15 ++++++++++++---
>  drivers/soc/mediatek/mtk-mmsys.h    |  1 +
>  3 files changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mt8195-mmsys.h b/drivers/soc/mediatek/mt8195-mmsys.h
> index 648baaec112b..f67801c42fd9 100644
> --- a/drivers/soc/mediatek/mt8195-mmsys.h
> +++ b/drivers/soc/mediatek/mt8195-mmsys.h
> @@ -123,6 +123,7 @@
>  #define MT8195_VDO1_MIXER_SOUT_SEL_IN				0xf68
>  #define MT8195_MIXER_SOUT_SEL_IN_FROM_DISP_MIXER		(0 << 0)
>  
> +#define MT8195_VDO1_SW0_RST_B           0x1d0
>  #define MT8195_VDO1_MERGE0_ASYNC_CFG_WD	0xe30
>  #define MT8195_VDO1_MERGE1_ASYNC_CFG_WD	0xe40
>  #define MT8195_VDO1_MERGE2_ASYNC_CFG_WD	0xe50
> diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
> index 060065501b8a..97cb26339ef6 100644
> --- a/drivers/soc/mediatek/mtk-mmsys.c
> +++ b/drivers/soc/mediatek/mtk-mmsys.c
> @@ -18,6 +18,8 @@
>  #include "mt8365-mmsys.h"
>  #include "mt8195-mmsys.h"
>  
> +#define MMSYS_SW_RESET_PER_REG 32
> +
>  static const struct mtk_mmsys_driver_data mt2701_mmsys_driver_data = {
>  	.clk_driver = "clk-mt2701-mm",
>  	.routes = mmsys_default_routing_table,
> @@ -48,12 +50,14 @@ static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
>  	.clk_driver = "clk-mt8173-mm",
>  	.routes = mmsys_default_routing_table,
>  	.num_routes = ARRAY_SIZE(mmsys_default_routing_table),
> +	.sw_reset_start = MMSYS_SW0_RST_B,
>  };
>  
>  static const struct mtk_mmsys_driver_data mt8183_mmsys_driver_data = {
>  	.clk_driver = "clk-mt8183-mm",
>  	.routes = mmsys_mt8183_routing_table,
>  	.num_routes = ARRAY_SIZE(mmsys_mt8183_routing_table),
> +	.sw_reset_start = MMSYS_SW0_RST_B,
>  };
>  
>  static const struct mtk_mmsys_driver_data mt8365_mmsys_driver_data = {
> @@ -74,6 +78,7 @@ static const struct mtk_mmsys_driver_data mt8195_vdosys1_driver_data = {
>  	.num_routes = ARRAY_SIZE(mmsys_mt8195_routing_table),
>  	.config = mmsys_mt8195_config_table,
>  	.num_configs = ARRAY_SIZE(mmsys_mt8195_config_table),
> +	.sw_reset_start = MT8195_VDO1_SW0_RST_B,
>  };
>  
>  struct mtk_mmsys {
> @@ -126,19 +131,23 @@ static int mtk_mmsys_reset_update(struct reset_controller_dev *rcdev, unsigned l
>  {
>  	struct mtk_mmsys *mmsys = container_of(rcdev, struct mtk_mmsys, rcdev);
>  	unsigned long flags;
> +	u32 offset;
>  	u32 reg;
>  	int i;
>  
> +	offset = (id / MMSYS_SW_RESET_PER_REG) * sizeof(u32);
> +	id = id % MMSYS_SW_RESET_PER_REG;
> +
>  	spin_lock_irqsave(&mmsys->lock, flags);
>  
> -	reg = readl_relaxed(mmsys->regs + MMSYS_SW0_RST_B);
> +	reg = readl_relaxed(mmsys->regs + mmsys->data->sw_reset_start + offset);
>  
>  	if (assert)
>  		reg &= ~BIT(id);
>  	else
>  		reg |= BIT(id);
>  
> -	writel_relaxed(reg, mmsys->regs + MMSYS_SW0_RST_B);
> +	writel_relaxed(reg, mmsys->regs + mmsys->data->sw_reset_start + offset);
>  
>  	spin_unlock_irqrestore(&mmsys->lock, flags);
>  
> @@ -237,7 +246,7 @@ static int mtk_mmsys_probe(struct platform_device *pdev)
>  	spin_lock_init(&mmsys->lock);
>  
>  	mmsys->rcdev.owner = THIS_MODULE;
> -	mmsys->rcdev.nr_resets = 32;
> +	mmsys->rcdev.nr_resets = 64;

If only MT8195 vdosys1 has more than 32 reset bits, this should be kept
at 32 for the others.

regards
Philipp