linux-kernel - Re: [PATCH v3 04/16] soc: mediatek: pm-domains: Add bus protection protocol

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Message-ID: <891af5b7-42e1-3d52-b2b6-45139a92ec1a@collabora.com>
Date:   Fri, 30 Oct 2020 11:55:14 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Weiyi Lu <weiyi.lu@...iatek.com>
Cc:     linux-kernel@...r.kernel.org, matthias.bgg@...il.com,
        drinkcat@...omium.org, hsinyi@...omium.org,
        Collabora Kernel ML <kernel@...labora.com>,
        fparent@...libre.com, Matthias Brugger <mbrugger@...e.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 04/16] soc: mediatek: pm-domains: Add bus protection
 protocol

Hi Weiyi Lu,

Many thanks for your comments.

On 27/10/20 12:07, Weiyi Lu wrote:
> On Mon, 2020-10-26 at 18:55 +0100, Enric Balletbo i Serra wrote:
>> From: Matthias Brugger <mbrugger@...e.com>
>>
>> Bus protection will need to update more then one register
>> in infracfg. Add support for several operations.
>>
>> Signed-off-by: Matthias Brugger <mbrugger@...e.com>
>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
>> ---
>>
>> Changes in v3: None
>> Changes in v2: None
>>
>>  drivers/soc/mediatek/mt8173-pm-domains.h |  4 +--
>>  drivers/soc/mediatek/mtk-pm-domains.c    | 36 +++++++++++++++++-------
>>  drivers/soc/mediatek/mtk-pm-domains.h    |  4 ++-
>>  3 files changed, 31 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/soc/mediatek/mt8173-pm-domains.h b/drivers/soc/mediatek/mt8173-pm-domains.h
>> index a2a624bbd8b8..341cc287c8ce 100644
>> --- a/drivers/soc/mediatek/mt8173-pm-domains.h
>> +++ b/drivers/soc/mediatek/mt8173-pm-domains.h
>> @@ -34,7 +34,7 @@ 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 = {
>> +		.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,
>> @@ -76,7 +76,7 @@ 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 = {
>> +		.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 |
>> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
>> index 16503d6db6a8..2121e05cb9a4 100644
>> --- a/drivers/soc/mediatek/mtk-pm-domains.c
>> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
>> @@ -89,24 +89,40 @@ static int scpsys_sram_disable(struct scpsys_domain *pd)
>>  
>>  static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
>>  {
>> -	const struct scpsys_bus_prot_data *bp_data = &pd->data->bp_infracfg;
>> +	const struct scpsys_bus_prot_data *bpd = pd->data->bp_infracfg;
>> +	int i, ret;
>>  
>> -	if (!bp_data->bus_prot_mask)
>> -		return 0;
>> +	for (i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) {
>> +		if (!bpd[i].bus_prot_mask)
>> +			break;
>>  
>> -	return mtk_infracfg_set_bus_protection(pd->infracfg, bp_data->bus_prot_mask,
>> -					       bp_data->bus_prot_reg_update);
>> +		ret = mtk_infracfg_set_bus_protection(pd->infracfg,
>> +						      bpd[i].bus_prot_mask,
>> +						      bpd[i].bus_prot_reg_update);
>> +		if (ret)
>> +			return ret;
>> +	}
>> +
>> +	return 0;
>>  }
>>  
>>  static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
>>  {
>> -	const struct scpsys_bus_prot_data *bp_data = &pd->data->bp_infracfg;
>> +	const struct scpsys_bus_prot_data *bpd = pd->data->bp_infracfg;
>> +	int i, ret;
>>  
>> -	if (!bp_data->bus_prot_mask)
>> -		return 0;
>> +	for (i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) {
> 
> I thought it should be
> 
> for (i = SPM_MAX_BUS_PROT_DATA - 1; i > 0; i--) {
> 	if (!bpd[i].bus_prot_mask)
> 		continue;
> 

Done.

> ...
> 
>> +		if (!bpd[i].bus_prot_mask)
>> +			return 0;
>>  
>> -	return mtk_infracfg_clear_bus_protection(pd->infracfg, bp_data->bus_prot_mask,
>> -						 bp_data->bus_prot_reg_update);
>> +		ret = mtk_infracfg_clear_bus_protection(pd->infracfg,
>> +							bpd[i].bus_prot_mask,
>> +							bpd[i].bus_prot_reg_update);
>> +		if (ret)
>> +			return ret;
>> +	}
>> +
>> +	return 0;
>>  }
>>  
>>  static int scpsys_power_on(struct generic_pm_domain *genpd)
>> diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
>> index 7c8efcb3cef2..e428fe23a7e3 100644
>> --- a/drivers/soc/mediatek/mtk-pm-domains.h
>> +++ b/drivers/soc/mediatek/mtk-pm-domains.h
>> @@ -32,6 +32,8 @@
>>  #define PWR_STATUS_AUDIO		BIT(24)
>>  #define PWR_STATUS_USB			BIT(25)
>>  
>> +#define SPM_MAX_BUS_PROT_DATA		3
>> +
> 
> #define SPM_MAX_BUS_PROT_DATA		5
> 
> to be compatible with MT8192
> 

Done.

>>  struct scpsys_bus_prot_data {
>>  	u32 bus_prot_mask;
>>  	bool bus_prot_reg_update;
>> @@ -52,7 +54,7 @@ struct scpsys_domain_data {
>>  	u32 sram_pdn_bits;
>>  	u32 sram_pdn_ack_bits;
>>  	u8 caps;
>> -	const struct scpsys_bus_prot_data bp_infracfg;
>> +	const struct scpsys_bus_prot_data bp_infracfg[SPM_MAX_BUS_PROT_DATA];
>>  };
>>  
>>  struct scpsys_soc_data {
>