From: Dmitry Osipenko <digetx@gmail.com>
To: Sowjanya Komatineni <skomatineni@nvidia.com>,
thierry.reding@gmail.com, jonathanh@nvidia.com,
tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com,
linus.walleij@linaro.org, stefan@agner.ch, mark.rutland@arm.com
Cc: pdeschrijver@nvidia.com, pgaikwad@nvidia.com, sboyd@kernel.org,
linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org,
jckuo@nvidia.com, josephl@nvidia.com, talho@nvidia.com,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
mperttunen@nvidia.com, spatra@nvidia.com, robh+dt@kernel.org,
devicetree@vger.kernel.org
Subject: Re: [PATCH V6 16/21] soc/tegra: pmc: Add pmc wake support for tegra210
Date: Tue, 23 Jul 2019 06:03:55 +0300 [thread overview]
Message-ID: <70ad28cb-c268-cbbe-36f5-39df26617d8e@gmail.com> (raw)
In-Reply-To: <71a88a9c-a542-557a-0eaa-3c90112dee0e@nvidia.com>
23.07.2019 4:52, Sowjanya Komatineni пишет:
>
> On 7/22/19 6:41 PM, Dmitry Osipenko wrote:
>> 23.07.2019 4:08, Dmitry Osipenko пишет:
>>> 23.07.2019 3:58, Dmitry Osipenko пишет:
>>>> 21.07.2019 22:40, Sowjanya Komatineni пишет:
>>>>> This patch implements PMC wakeup sequence for Tegra210 and defines
>>>>> common used RTC alarm wake event.
>>>>>
>>>>> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
>>>>> ---
>>>>> drivers/soc/tegra/pmc.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++
>>>>> 1 file changed, 111 insertions(+)
>>>>>
>>>>> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
>>>>> index 91c84d0e66ae..c556f38874e1 100644
>>>>> --- a/drivers/soc/tegra/pmc.c
>>>>> +++ b/drivers/soc/tegra/pmc.c
>>>>> @@ -57,6 +57,12 @@
>>>>> #define PMC_CNTRL_SYSCLK_OE BIT(11) /* system clock enable */
>>>>> #define PMC_CNTRL_SYSCLK_POLARITY BIT(10) /* sys clk polarity */
>>>>> #define PMC_CNTRL_MAIN_RST BIT(4)
>>>>> +#define PMC_CNTRL_LATCH_WAKEUPS BIT(5)
>>> Please follow the TRM's bits naming.
>>>
>>> PMC_CNTRL_LATCHWAKE_EN
>>>
>>>>> +#define PMC_WAKE_MASK 0x0c
>>>>> +#define PMC_WAKE_LEVEL 0x10
>>>>> +#define PMC_WAKE_STATUS 0x14
>>>>> +#define PMC_SW_WAKE_STATUS 0x18
>>>>>
>>>>> #define DPD_SAMPLE 0x020
>>>>> #define DPD_SAMPLE_ENABLE BIT(0)
>>>>> @@ -87,6 +93,11 @@
>>>>>
>>>>> #define PMC_SCRATCH41 0x140
>>>>>
>>>>> +#define PMC_WAKE2_MASK 0x160
>>>>> +#define PMC_WAKE2_LEVEL 0x164
>>>>> +#define PMC_WAKE2_STATUS 0x168
>>>>> +#define PMC_SW_WAKE2_STATUS 0x16c
>>>>> +
>>>>> #define PMC_SENSOR_CTRL 0x1b0
>>>>> #define PMC_SENSOR_CTRL_SCRATCH_WRITE BIT(2)
>>>>> #define PMC_SENSOR_CTRL_ENABLE_RST BIT(1)
>>>>> @@ -1922,6 +1933,55 @@ static const struct irq_domain_ops tegra_pmc_irq_domain_ops = {
>>>>> .alloc = tegra_pmc_irq_alloc,
>>>>> };
>>>>>
>>>>> +static int tegra210_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
>>>>> +{
>>>>> + struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
>>>>> + unsigned int offset, bit;
>>>>> + u32 value;
>>>>> +
>>>>> + if (data->hwirq == ULONG_MAX)
>>>>> + return 0;
>>>>> +
>>>>> + offset = data->hwirq / 32;
>>>>> + bit = data->hwirq % 32;
>>>>> +
>>>>> + /*
>>>>> + * Latch wakeups to SW_WAKE_STATUS register to capture events
>>>>> + * that would not make it into wakeup event register during LP0 exit.
>>>>> + */
>>>>> + value = tegra_pmc_readl(pmc, PMC_CNTRL);
>>>>> + value |= PMC_CNTRL_LATCH_WAKEUPS;
>>>>> + tegra_pmc_writel(pmc, value, PMC_CNTRL);
>>>>> + udelay(120);
>>>> Why it takes so much time to latch the values? Shouldn't some status-bit
>>>> be polled for the completion of latching?
>>>>
>>>> Is this register-write really getting buffered in the PMC?
>>>>
>>>>> + value &= ~PMC_CNTRL_LATCH_WAKEUPS;
>>>>> + tegra_pmc_writel(pmc, value, PMC_CNTRL);
>>>>> + udelay(120);
>>>> 120 usecs to remove latching, really?
>>>>
>>>>> + tegra_pmc_writel(pmc, 0, PMC_SW_WAKE_STATUS);
>>>>> + tegra_pmc_writel(pmc, 0, PMC_SW_WAKE2_STATUS);
>>>>> +
>>>>> + tegra_pmc_writel(pmc, 0, PMC_WAKE_STATUS);
>>>>> + tegra_pmc_writel(pmc, 0, PMC_WAKE2_STATUS);
>>>>> +
>>>>> + /* enable PMC wake */
>>>>> + if (data->hwirq >= 32)
>>>>> + offset = PMC_WAKE2_MASK;
>>>>> + else
>>>>> + offset = PMC_WAKE_MASK;
>>>>> +
>>>>> + value = tegra_pmc_readl(pmc, offset);
>>>>> +
>>>>> + if (on)
>>>>> + value |= 1 << bit;
>>>>> + else
>>>>> + value &= ~(1 << bit);
>>>>> +
>>>>> + tegra_pmc_writel(pmc, value, offset);
>>>> Why the latching is done *before* writing into the WAKE registers? What
>>>> it is latching then?
>>> I'm looking at the TRM doc and it says that latching should be done
>>> *after* writing to the WAKE_MASK / LEVEL registers.
>>>
>>> Secondly it says that it's enough to do:
>>>
>>> value = tegra_pmc_readl(pmc, PMC_CNTRL);
>>> value |= PMC_CNTRL_LATCH_WAKEUPS;
>>> tegra_pmc_writel(pmc, value, PMC_CNTRL);
>>>
>>> in order to latch. There is no need for the delay and to remove the
>>> "LATCHWAKE_EN" bit, it should be a oneshot action.
>> Although, no. TRM says "stops latching on transition from 1
>> to 0 (sequence - set to 1,set to 0)", so it's not a oneshot action.
>>
>> Have you tested this code at all? I'm wondering how it happens to work
>> without a proper latching.
> Yes, ofcourse its tested and this sequence to do transition is
> recommendation from Tegra designer.
> Will check if TRM doesn't have update properly or will re-confirm
> internally on delay time...
>
> On any of the wake event PMC wakeup happens and WAKE_STATUS register
> will have bits set for all events that triggered wake.
> After wakeup PMC doesn't update SW_WAKE_STATUS register as per PMC design.
> SW latch register added in design helps to provide a way to capture
> those events that happen right during wakeup time and didnt make it to
> SW_WAKE_STATUS register.
> So before next suspend entry, latching all prior wake events into SW
> WAKE_STATUS and then clearing them.
I'm now wondering whether the latching cold be turned ON permanently
during of the PMC's probe, for simplicity.
> LATCHWAKE_EN - When set, enables latching and stops latching on
> transition from 1 to 0
> There is recommendation of min 120uSec for this transition to stop
> latching. Will double-check why 120uSec
Yes, please check.
>>>>> + return 0;
>>>>> +}
>>>>> +
>>>>> static int tegra186_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
>>>>> {
>>>>> struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
>>>>> @@ -1954,6 +2014,49 @@ static int tegra186_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
>>>>> return 0;
>>>>> }
>>>>>
>>>>> +static int tegra210_pmc_irq_set_type(struct irq_data *data, unsigned int type)
>>>>> +{
>>>>> + struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
>>>>> + unsigned int offset, bit;
>>>>> + u32 value;
>>>>> +
>>>>> + if (data->hwirq == ULONG_MAX)
>>>>> + return 0;
>>>>> +
>>>>> + offset = data->hwirq / 32;
>>>>> + bit = data->hwirq % 32;
>>>>> +
>>>>> + if (data->hwirq >= 32)
>>>>> + offset = PMC_WAKE2_LEVEL;
>>>>> + else
>>>>> + offset = PMC_WAKE_LEVEL;
>>>>> +
>>>>> + value = tegra_pmc_readl(pmc, offset);
>>>>> +
>>>>> + switch (type) {
>>>>> + case IRQ_TYPE_EDGE_RISING:
>>>>> + case IRQ_TYPE_LEVEL_HIGH:
>>>>> + value |= 1 << bit;
>>>>> + break;
>>>>> +
>>>>> + case IRQ_TYPE_EDGE_FALLING:
>>>>> + case IRQ_TYPE_LEVEL_LOW:
>>>>> + value &= ~(1 << bit);
>>>>> + break;
>>>>> +
>>>>> + case IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING:
>>>>> + value ^= 1 << bit;
>>>>> + break;
>>>>> +
>>>>> + default:
>>>>> + return -EINVAL;
>>>>> + }
>>>>> +
>>>>> + tegra_pmc_writel(pmc, value, offset);
>>>> Shouldn't the WAKE_LEVEL be latched as well?
> WAKE_LEVELs dont need any latch as they are the levels SW sets for wake
> trigger and they are not status
Okay.
[snip]
next prev parent reply other threads:[~2019-07-23 3:03 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-21 19:40 [PATCH V6 00/21] SC7 entry and exit support for Tegra210 Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 01/21] irqchip: tegra: Do not disable COP IRQ during suspend Sowjanya Komatineni
2019-07-21 20:24 ` Marc Zyngier
2019-07-22 9:54 ` Dmitry Osipenko
2019-07-22 10:13 ` Marc Zyngier
2019-07-22 10:57 ` Dmitry Osipenko
2019-07-22 16:21 ` Sowjanya Komatineni
2019-07-22 18:38 ` Marc Zyngier
2019-07-22 23:35 ` Dmitry Osipenko
2019-07-24 23:09 ` Sowjanya Komatineni
2019-07-26 4:48 ` Dmitry Osipenko
2019-07-25 9:55 ` Peter De Schrijver
2019-07-25 10:05 ` Dmitry Osipenko
2019-07-25 10:33 ` Peter De Schrijver
2019-07-25 10:38 ` Peter De Schrijver
2019-07-25 10:59 ` Dmitry Osipenko
2019-08-02 13:05 ` Peter De Schrijver
2019-08-02 17:35 ` Dmitry Osipenko
2019-07-21 19:40 ` [PATCH V6 02/21] pinctrl: tegra: Add suspend and resume support Sowjanya Komatineni
2019-07-21 22:03 ` Dmitry Osipenko
2019-07-21 22:09 ` Dmitry Osipenko
2019-07-21 22:48 ` Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 03/21] pinctrl: tegra210: Add Tegra210 pinctrl pm ops Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 04/21] clk: tegra: Save and restore divider rate Sowjanya Komatineni
2019-07-21 22:14 ` Dmitry Osipenko
2019-07-21 19:40 ` [PATCH V6 05/21] clk: tegra: pllout: Save and restore pllout context Sowjanya Komatineni
2019-07-21 22:18 ` Dmitry Osipenko
2019-07-21 19:40 ` [PATCH V6 06/21] clk: tegra: pll: Save and restore pll context Sowjanya Komatineni
2019-07-21 21:44 ` Dmitry Osipenko
2019-07-21 22:47 ` Sowjanya Komatineni
2019-07-21 22:21 ` Dmitry Osipenko
2019-07-22 3:22 ` Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 07/21] clk: tegra: Support for OSC context save and restore Sowjanya Komatineni
2019-07-22 10:12 ` Dmitry Osipenko
2019-07-21 19:40 ` [PATCH V6 08/21] clk: tegra: clk-periph: Add save and restore support Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 09/21] clk: tegra: clk-super: Fix to enable PLLP branches to CPU Sowjanya Komatineni
2019-07-21 21:16 ` Dmitry Osipenko
2019-07-21 22:39 ` Sowjanya Komatineni
2019-07-22 3:17 ` Sowjanya Komatineni
2019-07-22 6:32 ` Dmitry Osipenko
2019-07-22 7:12 ` Sowjanya Komatineni
2019-07-22 7:17 ` Dmitry Osipenko
2019-07-22 7:24 ` Sowjanya Komatineni
2019-07-22 7:30 ` Dmitry Osipenko
2019-07-22 7:36 ` Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 10/21] clk: tegra: clk-super: Add save and restore support Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 11/21] clk: tegra: clk-dfll: Add suspend and resume support Sowjanya Komatineni
2019-07-21 21:32 ` Dmitry Osipenko
2019-07-21 22:42 ` Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 12/21] cpufreq: tegra124: " Sowjanya Komatineni
2019-07-21 21:04 ` Dmitry Osipenko
2019-07-21 19:40 ` [PATCH V6 13/21] clk: tegra210: Use fence_udelay during PLLU init Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 14/21] clk: tegra210: Add suspend and resume support Sowjanya Komatineni
2019-07-21 21:38 ` Dmitry Osipenko
2019-07-21 22:45 ` Sowjanya Komatineni
2019-07-22 6:10 ` Dmitry Osipenko
2019-07-22 6:52 ` Sowjanya Komatineni
2019-07-22 7:09 ` Dmitry Osipenko
2019-07-22 7:12 ` Dmitry Osipenko
2019-08-02 17:51 ` Stephen Boyd
2019-08-02 20:39 ` Sowjanya Komatineni
2019-08-07 21:22 ` Stephen Boyd
2019-07-21 19:40 ` [PATCH V6 15/21] soc/tegra: pmc: Allow to support more tegras wake Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 16/21] soc/tegra: pmc: Add pmc wake support for tegra210 Sowjanya Komatineni
2019-07-23 0:58 ` Dmitry Osipenko
2019-07-23 1:08 ` Dmitry Osipenko
2019-07-23 1:41 ` Dmitry Osipenko
2019-07-23 1:52 ` Sowjanya Komatineni
2019-07-23 3:03 ` Dmitry Osipenko [this message]
2019-07-23 3:09 ` Sowjanya Komatineni
2019-07-23 3:25 ` Dmitry Osipenko
2019-07-23 3:31 ` Sowjanya Komatineni
2019-07-23 3:43 ` Dmitry Osipenko
2019-07-23 14:27 ` Dmitry Osipenko
2019-07-23 23:39 ` Sowjanya Komatineni
2019-07-24 9:31 ` Dmitry Osipenko
2019-07-23 1:52 ` Dmitry Osipenko
2019-07-23 2:10 ` Dmitry Osipenko
2019-07-21 19:40 ` [PATCH V6 17/21] arm64: tegra: Enable wake from deep sleep on RTC alarm Sowjanya Komatineni
2019-07-26 6:30 ` Dmitry Osipenko
2019-07-21 19:40 ` [PATCH V6 18/21] soc/tegra: pmc: Configure core power request polarity Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 19/21] soc/tegra: pmc: Configure deep sleep control settings Sowjanya Komatineni
2019-07-21 19:40 ` [PATCH V6 20/21] arm64: dts: tegra210-p2180: Jetson TX1 SC7 timings Sowjanya Komatineni
2019-07-21 19:41 ` [PATCH V6 21/21] arm64: dts: tegra210-p3450: Jetson nano " Sowjanya Komatineni
2019-07-21 22:25 ` Dmitry Osipenko
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