linux-kernel - Re: [PATCH 3/8] soc: mediatek: pm-domains: Create bus protection operation functions

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Message-ID: <fb36ce3f-dd67-32b5-7ce0-ad15dd3b540a@gmail.com>
Date:   Fri, 3 Feb 2023 13:32:11 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Markus Schneider-Pargmann <msp@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Chun-Jie Chen <chun-jie.chen@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Fabien Parent <parent.f@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 3/8] soc: mediatek: pm-domains: Create bus protection
 operation functions



On 05/01/2023 18:07, Markus Schneider-Pargmann wrote:
> Separate the register access used for bus protection enable/disable into
> their own functions. These will be used later for WAY_EN bits.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> ---
>   drivers/soc/mediatek/mtk-pm-domains.c | 68 +++++++++++++++------------
>   1 file changed, 39 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> index 4333cd297405..999e1f6c86b0 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.c
> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> @@ -117,26 +117,50 @@ static int scpsys_sram_disable(struct scpsys_domain *pd)
>   					MTK_POLL_TIMEOUT);
>   }
>   
> +static int scpsys_bus_protect_clear(const struct scpsys_bus_prot_data *bpd,
> +				    struct regmap *regmap)
> +{
> +	u32 val;
> +	u32 sta_mask = bpd->bus_prot_sta_mask;
> +
> +	if (bpd->bus_prot_reg_update)
> +		regmap_clear_bits(regmap, bpd->bus_prot_clr, bpd->bus_prot_set_clr_mask);
> +	else
> +		regmap_write(regmap, bpd->bus_prot_clr, bpd->bus_prot_set_clr_mask);
> +
> +	if (bpd->ignore_clr_ack)
> +		return 0;
> +
> +	return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta,
> +					val, !(val & sta_mask),
> +					MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> +}
> +

NIT: please move this function below
static int scpsys_bus_protect_enable(struct scpsys_domain *pd) {...}

This allows for better readability.

> +static int scpsys_bus_protect_set(const struct scpsys_bus_prot_data *bpd,
> +				  struct regmap *regmap)
> +{
> +	u32 val;
> +	u32 sta_mask = bpd->bus_prot_sta_mask;
> +
> +	if (bpd->bus_prot_reg_update)
> +		regmap_set_bits(regmap, bpd->bus_prot_set, bpd->bus_prot_set_clr_mask);
> +	else
> +		regmap_write(regmap, bpd->bus_prot_set, bpd->bus_prot_set_clr_mask);
> +
> +	return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta,
> +					val, (val & sta_mask) == sta_mask,
> +					MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> +}
> +
>   static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, struct regmap *regmap)
>   {
>   	int i, ret;
>   
>   	for (i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) {
> -		u32 val;
> -		u32 set_clr_mask = bpd[i].bus_prot_set_clr_mask;
> -		u32 sta_mask = bpd[i].bus_prot_sta_mask;
> -
> -		if (!set_clr_mask)
> +		if (!bpd[i].bus_prot_set_clr_mask)
>   			break;
>   
> -		if (bpd[i].bus_prot_reg_update)
> -			regmap_set_bits(regmap, bpd[i].bus_prot_set, set_clr_mask);
> -		else
> -			regmap_write(regmap, bpd[i].bus_prot_set, set_clr_mask);
> -
> -		ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
> -					       val, (val & sta_mask) == sta_mask,
> -					       MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> +		ret = scpsys_bus_protect_set(&bpd[i], regmap);
>   		if (ret)
>   			return ret;
>   	}
> @@ -161,24 +185,10 @@ static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
>   	int i, ret;
>   
>   	for (i = SPM_MAX_BUS_PROT_DATA - 1; i >= 0; i--) {
> -		u32 val;
> -		u32 set_clr_mask = bpd[i].bus_prot_set_clr_mask;
> -		u32 sta_mask = bpd[i].bus_prot_sta_mask;
> -
> -		if (!set_clr_mask)
> -			continue;
> -
> -		if (bpd[i].bus_prot_reg_update)
> -			regmap_clear_bits(regmap, bpd[i].bus_prot_clr, set_clr_mask);
> -		else
> -			regmap_write(regmap, bpd[i].bus_prot_clr, set_clr_mask);
> -
> -		if (bpd[i].ignore_clr_ack)
> +		if (!bpd[i].bus_prot_set_clr_mask)
>   			continue;
>   
> -		ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
> -					       val, !(val & sta_mask),
> -					       MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> +		ret = scpsys_bus_protect_clear(&bpd[i], regmap);
>   		if (ret)
>   			return ret;
>   	}