linux-kernel - Re: [PATCH v1] soc: mediatek: mtk-pm-domains: Allow mt8186 ADSP default power on

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Date:   Wed, 23 Nov 2022 10:40:53 +0000
From:   TingHan Shen (沈廷翰) 
        <TingHan.Shen@...iatek.com>
To:     "matthias.bgg@...il.com" <matthias.bgg@...il.com>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Allen-KH Cheng (程冠勳) 
        <Allen-KH.Cheng@...iatek.com>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v1] soc: mediatek: mtk-pm-domains: Allow mt8186 ADSP
 default power on

On Wed, 2022-11-23 at 11:20 +0100, Matthias Brugger wrote:
> 
> On 12/10/2022 09:54, Tinghan Shen wrote:
> > In the use case of configuring the access permissions of the ADSP core,
> > the mt8186 SoC ADSP power will be switched on in the bootloader because
> > the permission control registers are located in the ADSP subsys.
> > 
> > Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> 
> Do we need a fixes tag here?
> My bet is:
> Fixes: 88590cbc1703 ("soc: mediatek: pm-domains: Add support for mt8186")
> 
> Or is this not yet a problem but needed to be able to implement access 
> permission configuration in the ADSP driver?
> 
> Regards,
> Matthias

This patch is needed to fix a warning when implementing the ADSP access permission configuration in preloader.

	[    0.334154] mtk-power-controller 10006000.syscon:power-controller: /soc/syscon@...06000/power-controller/power-domain@...power-domain@...power-domain@20: A default off power domain has been
ON
	[    0.334246] ------------[ cut here ]------------
	[    0.334252] top_adsp_bus already disabled
	[    0.334274] WARNING: CPU: 5 PID: 113 at drivers/clk/clk.c:969 clk_core_disable+0x90/0xb0

If not for this case, the pm-domain works fine.


Best regards,
TingHan

> 
> > ---
> >   drivers/soc/mediatek/mt8186-pm-domains.h | 4 +---
> >   1 file changed, 1 insertion(+), 3 deletions(-)
> > 
> > diff --git a/drivers/soc/mediatek/mt8186-pm-domains.h b/drivers/soc/mediatek/mt8186-pm-domains.h
> > index 108af61854a3..fce86f79c505 100644
> > --- a/drivers/soc/mediatek/mt8186-pm-domains.h
> > +++ b/drivers/soc/mediatek/mt8186-pm-domains.h
> > @@ -304,7 +304,6 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8186[] = {
> >   		.ctl_offs = 0x9FC,
> >   		.pwr_sta_offs = 0x16C,
> >   		.pwr_sta2nd_offs = 0x170,
> > -		.caps = MTK_SCPD_KEEP_DEFAULT_OFF,
> >   	},
> >   	[MT8186_POWER_DOMAIN_ADSP_INFRA] = {
> >   		.name = "adsp_infra",
> > @@ -312,7 +311,6 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8186[] = {
> >   		.ctl_offs = 0x9F8,
> >   		.pwr_sta_offs = 0x16C,
> >   		.pwr_sta2nd_offs = 0x170,
> > -		.caps = MTK_SCPD_KEEP_DEFAULT_OFF,
> >   	},
> >   	[MT8186_POWER_DOMAIN_ADSP_TOP] = {
> >   		.name = "adsp_top",
> > @@ -332,7 +330,7 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8186[] = {
> >   				MT8186_TOP_AXI_PROT_EN_3_CLR,
> >   				MT8186_TOP_AXI_PROT_EN_3_STA),
> >   		},
> > -		.caps = MTK_SCPD_SRAM_ISO | MTK_SCPD_KEEP_DEFAULT_OFF | MTK_SCPD_ACTIVE_WAKEUP,
> > +		.caps = MTK_SCPD_SRAM_ISO | MTK_SCPD_ACTIVE_WAKEUP,
> >   	},
> >   };
> >