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Mon, 24 Feb 2025 00:55:26 -0800 (PST) Message-ID: Date: Mon, 24 Feb 2025 10:55:23 +0200 Precedence: bulk X-Mailing-List: linux-rtc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 12/15] ARM: at91: pm: Enable ULP0 for SAMA7D65 To: Ryan.Wanner@microchip.com, lee@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, sre@kernel.org, Nicolas.Ferre@microchip.com, alexandre.belloni@bootlin.com, p.zabel@pengutronix.de Cc: linux@armlinux.org.uk, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rtc@vger.kernel.org References: <32ad3a1a-c6b6-4db1-8e80-8b5f951055a8@tuxon.dev> <5c6910ce-b0e4-47e6-9c9b-f0093d34f4a6@microchip.com> From: Claudiu Beznea Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 19.02.2025 17:24, Ryan.Wanner@microchip.com wrote: > On 2/17/25 00:18, Claudiu Beznea wrote: >> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe >> >> Hi, Ryan, >> >> On 14.02.2025 20:09, Ryan.Wanner@microchip.com wrote: >>> On 2/13/25 01:20, Claudiu Beznea wrote: >>>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe >>>> >>>> Hi, Ryan, >>>> >>>> >>>> On 10.02.2025 23:13, Ryan.Wanner@microchip.com wrote: >>>>> From: Ryan Wanner >>>>> >>>>> New clocks are saved to enable ULP0 for SAMA7D65 because this SoC has a >>>>> total of 10 main clocks that need to be saved for ULP0 mode. >>>> >>>> Isn't 9 the total number of MCKs that are handled in the last/first phase >>>> of suspend/resume? >>> Yes I was including 10 to match the indexing in the mck_count variable. >>> Since bgt instruction was suggested I will correct this to reflect the >>> true behavior of the change. >>>> >>>> Also, the state of MCKs are saved/restored for ULP0 and ULP1 as well. >>>> >>>>> >>>>> Add mck_count member to at91_pm_data, this will be used to determine >>>>> how many mcks need to be saved. In the mck_count member will also make >>>>> sure that no unnecessary clock settings are written during >>>>> mck_ps_restore. >>>>> >>>>> Add SHDWC to ULP0 mapping to clear the SHDWC status after exiting low >>>>> power modes. >>>> >>>> Can you explain why this clear need to be done? The commit message should >>>> answer to the "what?" and "why?" questions. >>>> >>>>> >>>>> Signed-off-by: Ryan Wanner >>>>> Acked-by: Nicolas Ferre >>>>> --- >>>>> arch/arm/mach-at91/pm.c | 19 +++++- >>>>> arch/arm/mach-at91/pm.h | 1 + >>>>> arch/arm/mach-at91/pm_data-offsets.c | 2 + >>>>> arch/arm/mach-at91/pm_suspend.S | 97 ++++++++++++++++++++++++++-- >>>>> 4 files changed, 110 insertions(+), 9 deletions(-) >>>>> >>>>> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c >>>>> index 55cab31ce1ecb..50bada544eede 100644 >>>>> --- a/arch/arm/mach-at91/pm.c >>>>> +++ b/arch/arm/mach-at91/pm.c >>>>> @@ -1337,6 +1337,7 @@ struct pmc_info { >>>>> unsigned long uhp_udp_mask; >>>>> unsigned long mckr; >>>>> unsigned long version; >>>>> + unsigned long mck_count;> }; >>>>> >>>>> static const struct pmc_info pmc_infos[] __initconst = { >>>>> @@ -1344,30 +1345,42 @@ static const struct pmc_info pmc_infos[] __initconst = { >>>>> .uhp_udp_mask = AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP, >>>>> .mckr = 0x30, >>>>> .version = AT91_PMC_V1, >>>>> + .mck_count = 1, >>>> >>>> As this member is used only for SAMA7 SoCs I would drop it here and above >>>> (where initialized with 1). >>>> >>>>> }, >>>>> >>>>> { >>>>> .uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP, >>>>> .mckr = 0x30, >>>>> .version = AT91_PMC_V1, >>>>> + .mck_count = 1, >>>>> }, >>>>> { >>>>> .uhp_udp_mask = AT91SAM926x_PMC_UHP, >>>>> .mckr = 0x30, >>>>> .version = AT91_PMC_V1, >>>>> + .mck_count = 1, >>>>> }, >>>>> { .uhp_udp_mask = 0, >>>>> .mckr = 0x30, >>>>> .version = AT91_PMC_V1, >>>>> + .mck_count = 1, >>>>> }, >>>>> { >>>>> .uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP, >>>>> .mckr = 0x28, >>>>> .version = AT91_PMC_V2, >>>>> + .mck_count = 1, >>>>> }, >>>>> { >>>>> .mckr = 0x28, >>>>> .version = AT91_PMC_V2, >>>>> + .mck_count = 5, >>>> >>>> I'm not sure mck_count is a good name when used like proposed in this >>>> patch. We know that only 4 MCKs need to be handled for SAMA7G5 and 9 for >>>> SAMA7D65. >>>> >>>> Maybe, better change it here to 4 (.mck_count = 4) and to 9 above >>>> (.mck_count = 9) and adjust properly the assembly macros (see below)? What >>>> do you think? >>> >>> Yes I think this is better and cleaner to read. Should this mck_count >>> match the pmc_mck_count variable name? Or should this be more >>> descriptive or would mcks be sufficient. >> >> mck_count/mcks should be enough. These will be anyway in the context of >> pmc_info. >> >>>> >>>>> + }, >>>>> + { >>>>> + .uhp_udp_mask = AT91SAM926x_PMC_UHP, >>>>> + .mckr = 0x28, >>>>> + .version = AT91_PMC_V2, >>>>> + .mck_count = 10, >>>>> }, >>>>> >>>>> }; >>>>> @@ -1386,7 +1399,7 @@ static const struct of_device_id atmel_pmc_ids[] __initconst = { >>>>> { .compatible = "atmel,sama5d2-pmc", .data = &pmc_infos[1] }, >>>>> { .compatible = "microchip,sam9x60-pmc", .data = &pmc_infos[4] }, >>>>> { .compatible = "microchip,sam9x7-pmc", .data = &pmc_infos[4] }, >>>>> - { .compatible = "microchip,sama7d65-pmc", .data = &pmc_infos[4] }, >>>>> + { .compatible = "microchip,sama7d65-pmc", .data = &pmc_infos[6] }, >>>>> { .compatible = "microchip,sama7g5-pmc", .data = &pmc_infos[5] }, >>>>> { /* sentinel */ }, >>>>> }; >>>>> @@ -1457,6 +1470,7 @@ static void __init at91_pm_init(void (*pm_idle)(void)) >>>>> soc_pm.data.uhp_udp_mask = pmc->uhp_udp_mask; >>>>> soc_pm.data.pmc_mckr_offset = pmc->mckr; >>>>> soc_pm.data.pmc_version = pmc->version; >>>>> + soc_pm.data.pmc_mck_count = pmc->mck_count; >>>>> >>>>> if (pm_idle) >>>>> arm_pm_idle = pm_idle; >>>>> @@ -1659,7 +1673,8 @@ void __init sama7_pm_init(void) >>>>> AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP1, AT91_PM_BACKUP, >>>>> }; >>>>> static const u32 iomaps[] __initconst = { >>>>> - [AT91_PM_ULP0] = AT91_PM_IOMAP(SFRBU), >>>>> + [AT91_PM_ULP0] = AT91_PM_IOMAP(SFRBU) | >>>>> + AT91_PM_IOMAP(SHDWC), >>>> >>>> In theory, as the wakeup sources can also resumes the system from standby >>>> (WFI), the shdwc should be mapped for standby, too. Unless I'm wrong and >>>> the wakeup sources covered by the SHDWC_SR register don't apply to standby >>>> (WFI). >>> The device can wake up from an RTT or RTC alarm event on both the >>> standby power mode and the ULP0 power mode, since the RTT/RTC are >>> included in the SHDWC_SR I think it is safe to have this. >>> If I understand what you are asking correctly. >> >> I was asking if the SHDWC should also be mapped for standby like: > Ok I see. I have a better understanding now of wake up sources table > like you showed below. I think for readability of code I should not have > SHDWC set as ULP0 and STANDBY source because in at91_pm_config_ws() > SHDWC is only configured as a wake up source in ULP1 power mode. > > So removing SHDWC from the ULP0 wake up source would reflect more > accurately what is configured as a wake up source in the code. What do > you think? Sounds good. Thank you, Claudiu