From: Enric Balletbo Serra <eballetbo@gmail.com>
To: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Enric Balletbo i Serra <enric.balletbo@collabora.com>,
chun-jie.chen@mediatek.corp-partner.google.com,
Yong Wu <yong.wu@mediatek.com>
Subject: Re: [PATCH 2/3] soc: mtk-pm-domains: do not register smi node as syscon
Date: Mon, 31 May 2021 23:36:07 +0200 [thread overview]
Message-ID: <CAFqH_53nNca8VG=09djYseJBWWg5j=YFTfPjxJL5w-aTyBmCng@mail.gmail.com> (raw)
In-Reply-To: <20210531043502.2702645-2-hsinyi@chromium.org>
Hi Hsin-Yi,
(again without html, sorry for the noise)
Thank you for the patch.
Missatge de Hsin-Yi Wang <hsinyi@chromium.org> del dia dl., 31 de maig
2021 a les 6:35:
>
> Mediatek requires mmsys clocks to be unprepared during suspend,
> otherwise system has chances to hang.
>
> syscon_regmap_lookup_by_phandle_optional() will attach and prepare the
> first clock in smi node, leading to additional prepare to the clock
> which is not balanced with the prepare/unprepare pair in resume/suspend
> callbacks.
>
> If a power domain node requests an smi node and the smi node's first
> clock is an mmsys clock, it will results in an unstabke suspend resume.
Typo s/unstabke/unstable/
I think it would be nice to have a Fixes tag for that patch. So can be
picked for the stable kernel more easily.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
I have a nit below but the patch looks good to me. So
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> ---
> drivers/soc/mediatek/mtk-pm-domains.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> index 536d8c64b2b4..a9ba71eee4bb 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.c
> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> @@ -296,7 +296,7 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
> {
> const struct scpsys_domain_data *domain_data;
> struct scpsys_domain *pd;
> - struct device_node *root_node = scpsys->dev->of_node;
> + struct device_node *root_node = scpsys->dev->of_node, *smi_node;
nit: Personal preference, but I'd prefer to add the smi_node in a new
line, so it's really clear that the only thing you are doing here is
adding a new variable.
> struct property *prop;
> const char *clk_name;
> int i, ret, num_clks;
> @@ -352,9 +352,13 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
> if (IS_ERR(pd->infracfg))
> return ERR_CAST(pd->infracfg);
>
> - pd->smi = syscon_regmap_lookup_by_phandle_optional(node, "mediatek,smi");
> - if (IS_ERR(pd->smi))
> - return ERR_CAST(pd->smi);
> + smi_node = of_parse_phandle(node, "mediatek,smi", 0);
> + if (smi_node) {
> + pd->smi = device_node_to_regmap(smi_node);
> + of_node_put(smi_node);
> + if (IS_ERR(pd->smi))
> + return ERR_CAST(pd->smi);
> + }
>
> num_clks = of_clk_get_parent_count(node);
> if (num_clks > 0) {
> --
> 2.32.0.rc0.204.g9fa02ecfa5-goog
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek
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next prev parent reply other threads:[~2021-05-31 21:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-31 4:35 [PATCH 1/3] soc: mtk-pm-domains: Fix the clock prepared issue Hsin-Yi Wang
2021-05-31 4:35 ` [PATCH 2/3] soc: mtk-pm-domains: do not register smi node as syscon Hsin-Yi Wang
2021-05-31 11:36 ` Chun-Jie Chen
2021-05-31 21:36 ` Enric Balletbo Serra [this message]
2021-05-31 4:35 ` [PATCH 3/3] arm64: dts: mt8183: remove syscon from smi_common node Hsin-Yi Wang
2021-05-31 21:39 ` Enric Balletbo Serra
2021-05-31 10:42 ` [PATCH 1/3] soc: mtk-pm-domains: Fix the clock prepared issue Chun-Jie Chen
2021-05-31 21:38 ` Enric Balletbo Serra
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