linux-kernel - Re: [PATCH v4] soc: mediatek: Add support always on flag

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Message-ID: <fbcafb3c519c4d6a914254d8958633a922267cf6.camel@mediatek.com>
Date:   Sun, 19 Jun 2022 15:30:02 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Min Guo <min.guo@...iatek.com>,
        MandyJH Liu <mandyjh.liu@...iatek.com>,
        Eddie Hung <eddie.hung@...iatek.com>,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        "Ulf Hansson" <ulf.hansson@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v4] soc: mediatek: Add support always on flag

On Fri, 2022-06-17 at 13:52 +0200, Matthias Brugger wrote:
> 
> On 17/06/2022 11:58, Chunfeng Yun wrote:
> > There is a t-phy shared by PCIe and USB3 on mt8195, if the t-phy is
> > used by PCIe, when power off its mtcmos, need software reset it
> > (workaround way, usually hardware do it, but has an issue on
> > mt8195),
> > but it has side effect to USB2 phy(works with USB3 phy to support
> > USB3.2 Gen1), so add support GENPD_FLAG_ALWAYS_ON flag, and make
> > its
> > power always on;
> > Another reason is that USB3.2 Gen1/2 need keep power always on when
> > support runtime-pm due to hardware limitation until now;
> > 
> > Reviewed-by: AngeloGioacchino Del Regno <
> > angelogioacchino.delregno@...labora.com>
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> 
> I changed the subject line to add pm-domains to it. Also Reviewed-by
> tags come 
> under the patch author Signed-off-by tag.
> 
> For the next time, please try to get a better commit message. It's
> difficult to 
> understand when reading the first time.
Got it, thanks a lot

> 
> Applied, thanks!
> 
> > ---
> > v4: add reviewed-by AngeloGioacchino
> > 
> > v3: make always-on flag exclusive with defualt-off flag
> > 
> > v2: keep active_wakeup flag for mt8195
> > ---
> >   drivers/soc/mediatek/mt8195-pm-domains.h | 2 +-
> >   drivers/soc/mediatek/mtk-pm-domains.c    | 3 +++
> >   drivers/soc/mediatek/mtk-pm-domains.h    | 2 ++
> >   3 files changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/soc/mediatek/mt8195-pm-domains.h
> > b/drivers/soc/mediatek/mt8195-pm-domains.h
> > index 938f4d51f5ae..0529d130b675 100644
> > --- a/drivers/soc/mediatek/mt8195-pm-domains.h
> > +++ b/drivers/soc/mediatek/mt8195-pm-domains.h
> > @@ -67,7 +67,7 @@ static const struct scpsys_domain_data
> > scpsys_domain_data_mt8195[] = {
> >   		.ctl_offs = 0x334,
> >   		.pwr_sta_offs = 0x174,
> >   		.pwr_sta2nd_offs = 0x178,
> > -		.caps = MTK_SCPD_ACTIVE_WAKEUP,
> > +		.caps = MTK_SCPD_ACTIVE_WAKEUP | MTK_SCPD_ALWAYS_ON,
> >   	},
> >   	[MT8195_POWER_DOMAIN_CSI_RX_TOP] = {
> >   		.name = "csi_rx_top",
> > diff --git a/drivers/soc/mediatek/mtk-pm-domains.c
> > b/drivers/soc/mediatek/mtk-pm-domains.c
> > index 5ced254b082b..a3dae391a38a 100644
> > --- a/drivers/soc/mediatek/mtk-pm-domains.c
> > +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> > @@ -428,6 +428,9 @@ generic_pm_domain *scpsys_add_one_domain(struct
> > scpsys *scpsys, struct device_no
> >   			dev_err(scpsys->dev, "%pOF: failed to power on
> > domain: %d\n", node, ret);
> >   			goto err_put_subsys_clocks;
> >   		}
> > +
> > +		if (MTK_SCPD_CAPS(pd, MTK_SCPD_ALWAYS_ON))
> > +			pd->genpd.flags |= GENPD_FLAG_ALWAYS_ON;
> >   	}
> >   
> >   	if (scpsys->domains[id]) {
> > diff --git a/drivers/soc/mediatek/mtk-pm-domains.h
> > b/drivers/soc/mediatek/mtk-pm-domains.h
> > index daa24e890dd4..7d3c0c36316c 100644
> > --- a/drivers/soc/mediatek/mtk-pm-domains.h
> > +++ b/drivers/soc/mediatek/mtk-pm-domains.h
> > @@ -8,6 +8,8 @@
> >   #define MTK_SCPD_SRAM_ISO		BIT(2)
> >   #define MTK_SCPD_KEEP_DEFAULT_OFF	BIT(3)
> >   #define MTK_SCPD_DOMAIN_SUPPLY		BIT(4)
> > +/* can't set MTK_SCPD_KEEP_DEFAULT_OFF at the same time */
> > +#define MTK_SCPD_ALWAYS_ON		BIT(5)
> >   #define MTK_SCPD_CAPS(_scpd, _x)	((_scpd)->data->caps & (_x))
> >   
> >   #define SPM_VDE_PWR_CON			0x0210