linux-kernel - Re: Warnings for invalid VDD (sdhci-s3c)

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Message-id: <56F3A0B7.4050509@samsung.com>
Date:	Thu, 24 Mar 2016 17:09:27 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Jisheng Zhang <jszhang@...vell.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	ludovic.desroches@...el.com
Cc:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org
Subject: Re: Warnings for invalid VDD (sdhci-s3c)

Hi,

On 03/24/2016 04:58 PM, Jisheng Zhang wrote:
> Hi,
> 
> On Thu, 24 Mar 2016 16:28:56 +0900 Krzysztof Kozlowski wrote:
> 
>> Hi,
>>
>> After 918f4cbd4340 ("mmc: sdhci: restore behavior when setting VDD via
>> external regulator") On Trats2 board I see warnings for invalid VDD
>> value (2.8V):
>>
>> [    3.119656] ------------[ cut here ]------------
>> [    3.119666] WARNING: CPU: 3 PID: 90 at
>> ../drivers/mmc/host/sdhci.c:1234 sdhci_do_set_ios+0x4cc/0x5e0
>> [    3.119669] mmc0: Invalid vdd 0x10
> 
> Per my understanding, the wrong vdd indicates a wrong ocr, what's the voltage of
> this host's vmmc regulator?

As i know, it's fixed-voltage with gpio on trats2. It's 2.8V.
I didn't check this entirely..need to check ocr value.

Best Regards,
Jaehoon Chung
> 
> Thanks,
> Jisheng
> 
>