Date:	Fri, 21 Aug 2015 18:57:28 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	<ulf.hansson@...aro.org>, <afenkart@...il.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<nsekhar@...com>
Subject: Re: [PATCH v2 00/16] omap_hsmmc: regulator usage cleanup and fixes

Hi Tony,

On Friday 21 August 2015 01:11 PM, Tony Lindgren wrote:
> * Kishon Vijay Abraham I <kishon@...com> [150820 05:39]:
>> Hi,
>>
>> On Monday 03 August 2015 05:56 PM, Kishon Vijay Abraham I wrote:
>>> Changes from v1:
>>> *) return on -EPROBE_DEFER and other fatal errors. (Don't return only
>>>    if the return value is -ENODEV)
>>> *) Remove the beagle x15 dts patch. It can be part of a different
>>>    series.
>>> *) Avoid using regulator_is_enabled for vqmmc since if the regulator
>>>    is shared and the other users are not using regulator_is_enabled
>>>    then there can be unbalanced regulator_enable/regulator_disable
>>>
>>> This patch series does the following
>>> *) Uses devm_regulator_get_optional() for vmmc and then removes the
>>>    CONFIG_REGULATOR check altogether.
>>> *) return on -EPROBE_DEFER and any other fatal errors
>>> *) enable/disable vmmc_aux regulator based on prior state
>>>
>>> I've pushed this patch series to
>>> git://git.ti.com/linux-phy/linux-phy.git mmc_regulator_cleanup_fixes_v2
>>>
>>> Please note the branch also has the pbias fixes [1] & [2].
>>> [1] -> https://lkml.org/lkml/2015/7/27/358
>>> [2] -> https://lkml.org/lkml/2015/7/27/391
>>>
>>> This series is in preparation for implementing the voltage switch
>>> sequence so that UHS cards can be supported.
>>>
>>> Did basic read/write test in J6, J6 Eco, Beagle-x15, AM437x EVM,
>>> Beaglebone black, OMAP5 uEVM and OMAP4 PANDA.
>>
>> I have now done read/write test in omap3 beagle-xm with this series!
> 
> Great thanks for doing that. Also gave this series a try here
> with my off idle MMC SDIO WLAN card test and things still work
> for me. That's not really testing the PBIAS regulator though,
> but a good torture test for saving and restoring context. So
> FWIW:
> 
> Tested-by: Tony Lindgren <tony@...mide.com>
> 
> If you need a PM torture test for PBIAS regulator, you could try
> to do the following on your beagle xm MMC card with
> oamp2plus_defconfig:
> 
> 1. Make sure EHCI modules are not loaded and OTG USB cable is
>    not connected
> 
> 2. Enable UART timeouts and off idle with something like:
> 
> !/bin/bash
> 
> uarts=$(find /sys/class/tty/tty[SO]*/device/power/ -type d)
> for uart in $uarts; do
>         echo 3000 > $uart/autosuspend_delay_ms 2>&1
> done
> 
> modprobe leds-gpio
> modprobe ledtrig-default-on
> 
> uarts=$(find /sys/class/tty/tty[SO]*/power/ -type d 2>/dev/null)
> for uart in $uarts; do
>         echo enabled > $uart/wakeup 2>&1
>         echo auto > $uart/control 2>&1
> done
> 
> echo 1 > /sys/kernel/debug/pm_debug/enable_off_mode
> 
> 3. Make sure you start seeing core_pwrdm OFF count increasing
>    with cat /sys/kernel/debug/pm_debug/count
> 
> MMC should keep on working when hitting idle, if not, something
> is not saved or restored properly. And SDIO WLAN cards should
> wake up the system and respond to ping if the wakeirq is
> configured in the dts file for the MMC controller. At least
> mwifiex_sdio cards work for this :)

Thanks for the detailed explanation. Sure will add those tests.

Cheers
Kishon
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