[rtc-linux] Re: [PATCH V3 5/5] rtc: max77686: move initialisation of rtc regmap, irq chip locally

[Krzysztof Kozlowski <k.kozlowski@samsung.com>]

On 03.02.2016 22:47, Laxman Dewangan wrote:
> To make RTC block of MAX77686/MAX77802 as independent driver,
> move the registration of i2c device, regmap for register access
> and irq_chip for interrupt support inside the RTC driver.
> Removed the same initialisation from MFD driver.
> 
> Having this change will allow to reuse this driver for different
> PMIC/devices from Maxim Semiconductor if they kept same RTC IP on
> different PMIC. Some of examples as PMIC MAX77620, MAX20024 where
> same RTC IP used and hence driver for these chips will use this
> driver only for RTC support.
> 
> Suggested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
> CC: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> CC: Javier Martinez Canillas <javier@osg.samsung.com>
> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
> 
> ---
> Changes from V1:
> - Remove changes from Kconfig.
> - Maintain all register definition in max77686 private header and remove
>   the movement to rtc driver.
> - Taken care of all comments on V1 from Krzysztof and Javier.
> 
> Changes from V2:
> - Taken care of missed sequence for removing the resource.
> - Fix the crash when doing unbind by using requested_threaded_irq()
>   instead of demv_requested_threaded_irq().
> 
>  drivers/mfd/max77686.c               |  85 +-------------------
>  drivers/rtc/rtc-max77686.c           | 148 ++++++++++++++++++++++++++++++-----
>  include/linux/mfd/max77686-private.h |   3 -
>  3 files changed, 130 insertions(+), 106 deletions(-)
> 

Looks good and works properly (RTC, unbind/rebind, wakealarm again)
but... after applying this patch the device cannot suspend to RAM after
unbind/rebind.

Reproduce path, after booting:
$ echo max77686-rtc > /sys/bus/platform/drivers/max77686-rtc/unbind
$ echo max77686-rtc > /sys/bus/platform/drivers/max77686-rtc/bind
$ rtcwake -d rtc2 -m mem -s 5 -v
(or instead of rtcwake: echo mem > /sys/power/state)

Proper behaviour:
##############################
[   28.549244] PM: late suspend of devices complete after 2.239 msecs
[   28.556051] PM: noirq suspend of devices complete after 2.078 msecs
[   28.560952] Disabling non-boot CPUs ...
[   28.588392] CPU1: shutdown
[   28.623283] CPU2: shutdown
[   28.653242] CPU3: shutdown

Power usage drops. Device wakes up (either from RTC or from manual, e.g.
key press)
##############################


Behaviour with patch 5/5:
[   67.068586] PM: Syncing filesystems ... done.
[   67.121673] Freezing user space processes ... (elapsed 0.004 seconds)
done.
[   67.123457] Freezing remaining freezable tasks ... (elapsed 0.001
seconds) done.
[   67.182024] wake enabled for irq 125
[   67.184315] wake enabled for irq 127
[   67.187829] wake enabled for irq 147
[   67.191238] wake enabled for irq 148
[   67.195178] dwc2 12480000.hsotg: suspending usb gadget g_ether
[   67.200647] dwc2 12480000.hsotg: new device is full-speed
[   67.206036] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
[   67.212523] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
[   67.221742] PM: suspend of devices complete after 93.132 msecs
[   67.226113] VALIVE_1.0V_AP: No configuration
[   67.230399] VCC_1.8V_AP: No configuration
[   67.234385] VCC_2.8V_AP: No configuration
[   67.238373] VCC_1.8V_IO: No configuration
[   67.243130] CAM_ISP_MIPI_1.2V: No configuration
[   67.249142] NFC_AVDD_1.8V: No configuration
[   67.252661] CAM_SENSOR_CORE_1.2V: No configuration
[   67.256648] CAM_ISP_SEN_IO_1.8V: No configuration
[   67.261311] VT_CAM_1.8V: No configuration
[   67.265323] VDDQ_PRE_1.8V: No configuration
[   67.269488] VTF_2.8V: No configuration
[   67.273219] VMEM_VDD_2.8V: No configuration
[   67.277386] TSP_AVDD_3.3V: No configuration
[   67.281553] TSP_VDD_1.8V: No configuration
[   67.285615] LCD_VCC_3.3V: No configuration
[   67.289712] MOTOR_VCC_3.0V: No configuration
[   67.296266] VMEM_1.2V_AP: No configuration
[   67.298902] VCC_SUB_1.35V: No configuration
[   67.303064] VCC_SUB_2.0V: No configuration
[   67.307142] VMEM_VDDF_3.0V: No configuration
[   67.311377] CAM_ISP_CORE_1.2V: No configuration
[   67.318181] PM: late suspend of devices complete after 2.267 msecs
[   67.325046] PM: noirq suspend of devices complete after 2.137 msecs
[   67.329857] Disabling non-boot CPUs ...

No CPU shutdown messages. Power usage not decreased, device does not
wake up.

I don't know yet what is the cause... At first glance it looks okay...

Best regards,
Krzysztof

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