Subject: Re: [PATCH 06/12] soc: mediatek: pm-domains: Add SMI block as bus protection block

From: Weiyi Lu <[email-masked]>
Date: Fri, 25 Sep 2020 18:45:47 +0800

On Thu, 2020-09-10 at 19:28 +0200, Enric Balletbo i Serra wrote:
> From: Matthias Brugger <[email-masked]>
> 
> Apart from the infracfg block, the SMI block is used to enable the bus
> protection for some power domains. Add support for this block.
> 
> Signed-off-by: Matthias Brugger <[email-masked]>
> Signed-off-by: Enric Balletbo i Serra <[email-masked]>
> ---
> 
>  drivers/soc/mediatek/mtk-pm-domains.c | 64 ++++++++++++++++++++-------
>  include/linux/soc/mediatek/infracfg.h |  6 +++
>  2 files changed, 53 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> index f609c2d454fa..3aa430a60602 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.c
> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> @@ -56,8 +56,25 @@
>  
>  #define SPM_MAX_BUS_PROT_DATA		3
>  
> +#define _BUS_PROT(_mask, _set, _clr, _sta, _update) {	\
> +		.bus_prot_mask = (_mask),		\
> +		.bus_prot_set = _set,			\
> +		.bus_prot_clr = _clr,			\
> +		.bus_prot_sta = _sta,			\
> +		.bus_prot_reg_update = _update,		\
> +	}
> +
> +#define BUS_PROT_WR(_mask, _set, _clr, _sta)		\
> +		_BUS_PROT(_mask, _set, _clr, _sta, false)
> +
> +#define BUS_PROT_UPDATE(_mask, _set, _clr, _sta)		\
> +		_BUS_PROT(_mask, _set, _clr, _sta, true)
> +
>  struct scpsys_bus_prot_data {
>  	u32 bus_prot_mask;
> +	u32 bus_prot_set;
> +	u32 bus_prot_clr;
> +	u32 bus_prot_sta;
>  	bool bus_prot_reg_update;
>  };
>  
> @@ -69,6 +86,7 @@ struct scpsys_bus_prot_data {
>   * @sram_pdn_ack_bits: The mask for sram power control acked bits.
>   * @caps: The flag for active wake-up action.
>   * @bp_infracfg: bus protection for infracfg subsystem
> + * @bp_smi: bus protection for smi subsystem
>   */
>  struct scpsys_domain_data {
>  	u32 sta_mask;
> @@ -77,6 +95,7 @@ struct scpsys_domain_data {
>  	u32 sram_pdn_ack_bits;
>  	u8 caps;
>  	const struct scpsys_bus_prot_data bp_infracfg[SPM_MAX_BUS_PROT_DATA];
> +	const struct scpsys_bus_prot_data bp_smi[SPM_MAX_BUS_PROT_DATA];
>  };
>  
>  struct scpsys_domain {
> @@ -86,6 +105,7 @@ struct scpsys_domain {
>  	int num_clks;
>  	struct clk_bulk_data *clks;
>  	struct regmap *infracfg;
> +	struct regmap *smi;
>  };
>  
>  struct scpsys_soc_data {
> @@ -173,9 +193,9 @@ static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, st
>  		if (bpd[i].bus_prot_reg_update)
>  			regmap_update_bits(regmap, INFRA_TOPAXI_PROTECTEN, mask, mask);
>  		else
> -			regmap_write(regmap, INFRA_TOPAXI_PROTECTEN_SET, mask);
> +			regmap_write(regmap, bpd[i].bus_prot_set, mask);
>  

Could it be?

if (bpd[i].bus_prot_set)
	regmap_write(regmap, bpd[i].bus_prot_set, mask);
else
	regmap_update_bits(regmap, INFRA_TOPAXI_PROTECTEN, mask, mask);

> -		ret = regmap_read_poll_timeout(regmap, INFRA_TOPAXI_PROTECTSTA1,
> +		ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
>  					       val, (val & mask) == mask,
>  					       MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
>  		if (ret)
> @@ -191,7 +211,11 @@ static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
>  	int ret;
>  
>  	ret = _scpsys_bus_protect_enable(bpd, pd->infracfg);
> -	return ret;
> +	if (ret)
> +		return ret;
> +
> +	bpd = pd->data->bp_smi;
> +	return _scpsys_bus_protect_enable(bpd, pd->smi);
>  }
>  
>  static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
> @@ -206,11 +230,11 @@ static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
>  			return 0;
>  
>  		if (bpd[i].bus_prot_reg_update)

ditto.

> -			regmap_update_bits(regmap, INFRA_TOPAXI_PROTECTEN, mask, 0);
> +			regmap_update_bits(regmap, bpd[i].bus_prot_set, mask, 0);
>  		else
> -			regmap_write(regmap, INFRA_TOPAXI_PROTECTEN_CLR, mask);
> +			regmap_write(regmap, bpd[i].bus_prot_clr, mask);
>  
> -		ret = regmap_read_poll_timeout(regmap, INFRA_TOPAXI_PROTECTSTA1,
> +		ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
>  					       val, !(val & mask),
>  					       MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
>  		if (ret)
> @@ -226,7 +250,11 @@ static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
>  	int ret;
>  
>  	ret = _scpsys_bus_protect_disable(bpd, pd->infracfg);
> -	return ret;
> +	if (ret)
> +		return ret;
> +
> +	bpd = pd->data->bp_smi;
> +	return _scpsys_bus_protect_disable(bpd, pd->smi);

It should have a reverse order compared to the enable control. But I'd
like to make it more flexible to any sequence, like INFRA->SMI->INFRA

>  }
>  
>  static int scpsys_power_on(struct generic_pm_domain *genpd)
> @@ -360,6 +388,10 @@ static int scpsys_add_one_domain(struct scpsys *scpsys, struct device_node *node
>  	if (IS_ERR(pd->infracfg))
>  		pd->infracfg = NULL;
>  
> +	pd->smi = syscon_regmap_lookup_by_phandle(node, "mediatek,smi");
> +	if (IS_ERR(pd->smi))
> +		pd->smi = NULL;
> +
>  	pd->num_clks = of_clk_get_parent_count(node);
>  	if (pd->num_clks > 0) {
>  		pd->clks = devm_kcalloc(scpsys->dev, pd->num_clks, sizeof(*pd->clks), GFP_KERNEL);
> @@ -532,10 +564,9 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8173[] = {
>  		.ctl_offs = SPM_DIS_PWR_CON,
>  		.sram_pdn_bits = GENMASK(11, 8),
>  		.sram_pdn_ack_bits = GENMASK(12, 12),
> -		.bp_infracfg[0] = {
> -			.bus_prot_reg_update = true,
> -			.bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MM_M0 |
> -				MT8173_TOP_AXI_PROT_EN_MM_M1,
> +		.bp_infracfg = {
> +			BUS_PROT_UPDATE_MT8173(MT8173_TOP_AXI_PROT_EN_MM_M0 |
> +					       MT8173_TOP_AXI_PROT_EN_MM_M1),
>  		},
>  	},
>  	[MT8173_POWER_DOMAIN_VENC_LT] = {
> @@ -574,12 +605,11 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8173[] = {
>  		.ctl_offs = SPM_MFG_PWR_CON,
>  		.sram_pdn_bits = GENMASK(13, 8),
>  		.sram_pdn_ack_bits = GENMASK(21, 16),
> -		.bp_infracfg[0] = {
> -			.bus_prot_reg_update = true,
> -			.bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MFG_S |
> -				MT8173_TOP_AXI_PROT_EN_MFG_M0 |
> -				MT8173_TOP_AXI_PROT_EN_MFG_M1 |
> -				MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT,
> +		.bp_infracfg = {
> +			BUS_PROT_UPDATE_MT8173(MT8173_TOP_AXI_PROT_EN_MFG_S |
> +					       MT8173_TOP_AXI_PROT_EN_MFG_M0 |
> +					       MT8173_TOP_AXI_PROT_EN_MFG_M1 |
> +					       MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT),
>  		},
>  	},
>  };
> diff --git a/include/linux/soc/mediatek/infracfg.h b/include/linux/soc/mediatek/infracfg.h
> index f967d02cc2ff..3f18cddffb44 100644
> --- a/include/linux/soc/mediatek/infracfg.h
> +++ b/include/linux/soc/mediatek/infracfg.h
> @@ -37,6 +37,12 @@
>  #define INFRA_TOPAXI_PROTECTEN_SET	0x0260
>  #define INFRA_TOPAXI_PROTECTEN_CLR	0x0264
>  
> +#define BUS_PROT_UPDATE_MT8173(_mask)			\
> +	BUS_PROT_UPDATE(_mask,				\
> +			INFRA_TOPAXI_PROTECTEN,		\
> +			INFRA_TOPAXI_PROTECTEN_CLR,	\
> +			INFRA_TOPAXI_PROTECTSTA1)
> +
>  int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask,
>  		bool reg_update);
>  int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask,

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