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SubjectRe: [PATCH v3 15/16] soc: mediatek: pm-domains: Add default power off flag
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On 27/10/2020 12:18, Weiyi Lu wrote:
> On Tue, 2020-10-27 at 11:53 +0100, Matthias Brugger wrote:
>>
>> On 26/10/2020 18:55, Enric Balletbo i Serra wrote:
>>> From: Weiyi Lu <weiyi.lu@mediatek.com>
>>>
>>> For some power domain, like conn on MT8192, it should be default OFF.
>>> Because the power on/off control relies the function of connectivity chip
>>> and its firmware. And if project choose other chip vendor solution,
>>> those necessary connectivity functions will not provided.
>>>
>>> Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
>>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
>>> ---
>>>
>>> Changes in v3: None
>>> Changes in v2: None
>>>
>>> drivers/soc/mediatek/mtk-pm-domains.c | 23 +++++++++++++++++------
>>> drivers/soc/mediatek/mtk-pm-domains.h | 1 +
>>> 2 files changed, 18 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
>>> index 63993076a544..fe0e955076a0 100644
>>> --- a/drivers/soc/mediatek/mtk-pm-domains.c
>>> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
>>> @@ -378,10 +378,16 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
>>> * software. The unused domains will be switched off during
>>> * late_init time.
>>> */
>>> - 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;
>>> + if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF)) {
>>> + if (scpsys_domain_is_on(pd))
>>> + dev_warn(scpsys->dev,
>>> + "%pOF: A default off power domain has been ON\n", node);
>>> + } else {
>>> + 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;
>>> + }
>>> }
>>>
>>> if (scpsys->domains[id]) {
>>> @@ -395,7 +401,11 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
>>> pd->genpd.power_off = scpsys_power_off;
>>> pd->genpd.power_on = scpsys_power_on;
>>>
>>> - pm_genpd_init(&pd->genpd, NULL, false);
>>> + if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF))
>>> + pm_genpd_init(&pd->genpd, NULL, true);
>>> + else
>>> + pm_genpd_init(&pd->genpd, NULL, false);
>>> +
>>> scpsys->domains[id] = &pd->genpd;
>>>
>>> return scpsys->pd_data.domains[id];
>>> @@ -478,7 +488,8 @@ 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);
>>>
>>> - scpsys_power_off(&pd->genpd);
>>> + if (!MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF))
>>> + scpsys_power_off(&pd->genpd);
>>
>> OK, so you merged Weiyi's patches in this series :)
>>
>> So same comment here: Does it really hurt if we turn-off a already turned-off
>> power domain? Or can we get rid of this check?
>>
>
> We do need this check here. If you try to turn-off this power domain,
> you might make the clock or regulator reference count unbalanced.
>

Correct. Could we check via scpsys_domain_is_on() instead? I'd like to avoid
MTK_SCPD_KEEP_DEFAULT_OFF use here.

Regards,
Matthias

>> Regards,
>> Matthias
>>
>>>
>>> clk_bulk_unprepare(pd->num_clks, pd->clks);
>>> clk_bulk_put(pd->num_clks, pd->clks);
>>> diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
>>> index 2ad213be84a5..0fa6a938b40c 100644
>>> --- a/drivers/soc/mediatek/mtk-pm-domains.h
>>> +++ b/drivers/soc/mediatek/mtk-pm-domains.h
>>> @@ -6,6 +6,7 @@
>>> #define MTK_SCPD_ACTIVE_WAKEUP BIT(0)
>>> #define MTK_SCPD_FWAIT_SRAM BIT(1)
>>> #define MTK_SCPD_SRAM_ISO BIT(2)
>>> +#define MTK_SCPD_KEEP_DEFAULT_OFF BIT(3)
>>> #define MTK_SCPD_CAPS(_scpd, _x) ((_scpd)->data->caps & (_x))
>>>
>>> #define SPM_VDE_PWR_CON 0x0210
>>>
>

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