linux-kernel - Re: [PATCH v5 2/8] soc: mediatek: pm-domains: Move bools to a flags field

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Message-ID: <3404135b-a893-523d-c776-3b6d10227049@collabora.com>
Date:   Mon, 19 Jun 2023 11:32:18 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Markus Schneider-Pargmann <msp@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Chun-Jie Chen <chun-jie.chen@...iatek.com>,
        Tinghan Shen <tinghan.shen@...iatek.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 v5 2/8] soc: mediatek: pm-domains: Move bools to a flags
 field

Il 19/06/23 10:53, Markus Schneider-Pargmann ha scritto:
> To simplify the macros, use a flags field for simple bools. This is in
> preparation for more flags.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> ---
>   drivers/soc/mediatek/mtk-pm-domains.c |  6 +++---
>   drivers/soc/mediatek/mtk-pm-domains.h | 19 +++++++++++--------
>   2 files changed, 14 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> index 354249cc1b12..aa9ab413479e 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.c
> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> @@ -128,7 +128,7 @@ static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, st
>   		if (!mask)
>   			break;
>   
> -		if (bpd[i].bus_prot_reg_update)
> +		if (bpd[i].flags & BUS_PROT_REG_UPDATE)
>   			regmap_set_bits(regmap, bpd[i].bus_prot_set, mask);
>   		else
>   			regmap_write(regmap, bpd[i].bus_prot_set, mask);
> @@ -165,12 +165,12 @@ static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
>   		if (!mask)
>   			continue;
>   
> -		if (bpd[i].bus_prot_reg_update)
> +		if (bpd[i].flags & BUS_PROT_REG_UPDATE)
>   			regmap_clear_bits(regmap, bpd[i].bus_prot_clr, mask);
>   		else
>   			regmap_write(regmap, bpd[i].bus_prot_clr, mask);
>   
> -		if (bpd[i].ignore_clr_ack)
> +		if (bpd[i].flags & BUS_PROT_IGNORE_CLR_ACK)
>   			continue;
>   
>   		ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
> index 5ec53ee073c4..e26c8c317a6b 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.h
> +++ b/drivers/soc/mediatek/mtk-pm-domains.h
> @@ -42,23 +42,27 @@
>   
>   #define SPM_MAX_BUS_PROT_DATA		6
>   
> -#define _BUS_PROT(_mask, _set, _clr, _sta, _update, _ignore) {	\
> +enum scpsys_bus_prot_flags {
> +	BUS_PROT_REG_UPDATE = BIT(1),
> +	BUS_PROT_IGNORE_CLR_ACK = BIT(2),
> +};
> +
> +#define _BUS_PROT(_mask, _set, _clr, _sta, _flags) {		\
>   		.bus_prot_mask = (_mask),			\
>   		.bus_prot_set = _set,				\
>   		.bus_prot_clr = _clr,				\
>   		.bus_prot_sta = _sta,				\
> -		.bus_prot_reg_update = _update,			\
> -		.ignore_clr_ack = _ignore,			\
> +		.flags = _flags					\
>   	}
>   
>   #define BUS_PROT_WR(_mask, _set, _clr, _sta)			\
> -		_BUS_PROT(_mask, _set, _clr, _sta, false, false)
> +		_BUS_PROT(_mask, _set, _clr, _sta, 0)
>   
>   #define BUS_PROT_WR_IGN(_mask, _set, _clr, _sta)		\
> -		_BUS_PROT(_mask, _set, _clr, _sta, false, true)
> +		_BUS_PROT(_mask, _set, _clr, _sta, BUS_PROT_IGNORE_CLR_ACK)
>   
>   #define BUS_PROT_UPDATE(_mask, _set, _clr, _sta)		\
> -		_BUS_PROT(_mask, _set, _clr, _sta, true, false)
> +		_BUS_PROT(_mask, _set, _clr, _sta, BUS_PROT_REG_UPDATE)
>   
>   #define BUS_PROT_UPDATE_TOPAXI(_mask)				\
>   		BUS_PROT_UPDATE(_mask,				\
> @@ -71,8 +75,7 @@ struct scpsys_bus_prot_data {
>   	u32 bus_prot_set;
>   	u32 bus_prot_clr;
>   	u32 bus_prot_sta;
> -	bool bus_prot_reg_update;
> -	bool ignore_clr_ack;
> +	u32 flags;

As far as I understand, we don't expect more than six bits to be populated as bus
protection flags, so we can save some memory by changing that to u8...

...after which:

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

Regards,
Angelo