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Message-ID: <CAFqH_50qTKnKGeKUGYs_TzqWzmMGqpeKgGVmhYWjC90Nn_nKUw@mail.gmail.com>
Date: Mon, 31 May 2021 23:38:23 +0200
From: Enric Balletbo Serra <eballetbo@...il.com>
To: Hsin-Yi Wang <hsinyi@...omium.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Rob Herring <robh+dt@...nel.org>,
Enric Balletbo i Serra <enric.balletbo@...labora.com>,
chun-jie.chen@...iatek.corp-partner.google.com,
Yong Wu <yong.wu@...iatek.com>
Subject: Re: [PATCH 1/3] soc: mtk-pm-domains: Fix the clock prepared issue
Hi Hsin-Yi,
Thank you for the patch.
Missatge de Hsin-Yi Wang <hsinyi@...omium.org> del dia dl., 31 de maig
2021 a les 6:35:
>
> From: Weiyi Lu <weiyi.lu@...iatek.com>
>
> In this new power domain driver, when adding one power domain
> it will prepare the depenedent clocks at the same.
Typo: s/depenedent/dependent/
> So we only do clk_bulk_enable/disable control during power ON/OFF.
> When system suspend, the pm runtime framework will forcely power off
> power domains. However, the dependent clocks are disabled but kept
> preapred.
Typo: s/preapred/prepared
>
> In MediaTek clock drivers, PLL would be turned ON when we do
> clk_bulk_prepare control.
>
> Clock hierarchy:
> PLL -->
> DIV_CK -->
> CLK_MUX
> (may be dependent clocks)
> -->
> SUBSYS_CG
> (may be dependent clocks)
>
> It will lead some unexpected clock states during system suspend.
> This patch will fix by doing prepare_enable/disable_unprepare on
> dependent clocks at the same time while we are going to power on/off
> any power domain.
>
I think it would be nice to have a Fixes tag here, so this can be
backported more easily.
> Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
> drivers/soc/mediatek/mtk-pm-domains.c | 31 +++++++--------------------
> 1 file changed, 8 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> index 0af00efa0ef8..536d8c64b2b4 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.c
> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> @@ -211,7 +211,7 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
> if (ret)
> return ret;
>
> - ret = clk_bulk_enable(pd->num_clks, pd->clks);
> + ret = clk_bulk_prepare_enable(pd->num_clks, pd->clks);
> if (ret)
> goto err_reg;
>
> @@ -229,7 +229,7 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
> regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_ISO_BIT);
> regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_RST_B_BIT);
>
> - ret = clk_bulk_enable(pd->num_subsys_clks, pd->subsys_clks);
> + ret = clk_bulk_prepare_enable(pd->num_subsys_clks, pd->subsys_clks);
> if (ret)
> goto err_pwr_ack;
>
> @@ -246,9 +246,9 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
> err_disable_sram:
> scpsys_sram_disable(pd);
> err_disable_subsys_clks:
> - clk_bulk_disable(pd->num_subsys_clks, pd->subsys_clks);
> + clk_bulk_disable_unprepare(pd->num_subsys_clks, pd->subsys_clks);
> err_pwr_ack:
> - clk_bulk_disable(pd->num_clks, pd->clks);
> + clk_bulk_disable_unprepare(pd->num_clks, pd->clks);
> err_reg:
> scpsys_regulator_disable(pd->supply);
> return ret;
> @@ -269,7 +269,7 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
> if (ret < 0)
> return ret;
>
> - clk_bulk_disable(pd->num_subsys_clks, pd->subsys_clks);
> + clk_bulk_disable_unprepare(pd->num_subsys_clks, pd->subsys_clks);
>
> /* subsys power off */
> regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_RST_B_BIT);
> @@ -284,7 +284,7 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
> if (ret < 0)
> return ret;
>
> - clk_bulk_disable(pd->num_clks, pd->clks);
> + clk_bulk_disable_unprepare(pd->num_clks, pd->clks);
>
> scpsys_regulator_disable(pd->supply);
>
> @@ -405,14 +405,6 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
> pd->subsys_clks[i].clk = clk;
> }
>
> - ret = clk_bulk_prepare(pd->num_clks, pd->clks);
> - if (ret)
> - goto err_put_subsys_clocks;
> -
> - ret = clk_bulk_prepare(pd->num_subsys_clks, pd->subsys_clks);
> - if (ret)
> - goto err_unprepare_clocks;
> -
> /*
> * Initially turn on all domains to make the domains usable
> * with !CONFIG_PM and to get the hardware in sync with the
> @@ -427,7 +419,7 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
> ret = scpsys_power_on(&pd->genpd);
> if (ret < 0) {
> dev_err(scpsys->dev, "%pOF: failed to power on domain: %d\n", node, ret);
> - goto err_unprepare_clocks;
> + goto err_put_subsys_clocks;
> }
> }
>
> @@ -435,7 +427,7 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
> ret = -EINVAL;
> dev_err(scpsys->dev,
> "power domain with id %d already exists, check your device-tree\n", id);
> - goto err_unprepare_subsys_clocks;
> + goto err_put_subsys_clocks;
> }
>
> if (!pd->data->name)
> @@ -455,10 +447,6 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
>
> return scpsys->pd_data.domains[id];
>
> -err_unprepare_subsys_clocks:
> - clk_bulk_unprepare(pd->num_subsys_clks, pd->subsys_clks);
> -err_unprepare_clocks:
> - clk_bulk_unprepare(pd->num_clks, pd->clks);
> err_put_subsys_clocks:
> clk_bulk_put(pd->num_subsys_clks, pd->subsys_clks);
> err_put_clocks:
> @@ -537,10 +525,7 @@ static void scpsys_remove_one_domain(struct scpsys_domain *pd)
> "failed to remove domain '%s' : %d - state may be inconsistent\n",
> pd->genpd.name, ret);
>
> - clk_bulk_unprepare(pd->num_clks, pd->clks);
> clk_bulk_put(pd->num_clks, pd->clks);
> -
> - clk_bulk_unprepare(pd->num_subsys_clks, pd->subsys_clks);
> clk_bulk_put(pd->num_subsys_clks, pd->subsys_clks);
> }
>
> --
> 2.32.0.rc0.204.g9fa02ecfa5-goog
>
>
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