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From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To: Stephen Boyd <sboyd@codeaurora.org>
Cc: linux-arm-msm@vger.kernel.org, agross@codeaurora.org
Subject: Re: [RFC PATCH 2/2] tty:msm_serial: Do not reset IP if we use bootconsole
Date: Tue, 17 Jun 2014 23:04:29 +0100	[thread overview]
Message-ID: <53A0BB6D.1090202@linaro.org> (raw)
In-Reply-To: <53A0AE6C.7040706@codeaurora.org>



On 17/06/14 22:09, Stephen Boyd wrote:
> On 06/10/14 07:32, Srinivas Kandagatla wrote:
>> The use case is when we boot the platform with bootconsole enabled. What
>> I noticed is that the console gets locked sometimes up before the bootconsole
>> is disabled.
>>
>> As part of console setup in serial driver it resets that hardware which
>> is a race condition to bootconsole using the same hardware. This
>> patch adds a check to see if there is bootconsole before reseting the hardware.
>>
>> Am sure there are better ways to solve this, so marking this patch as
>> RFC. Any suggestions are welcome.
>>
>>
>
> Isn't there some way to check and wait for the hardware to be unused
> before we reset it?
>
> I recall being able to overcome this "race condition" by removing the
> printks in the serial driver setup. Does that work for you?
>
Good point,
Its possible that removing prints during the transition fixes the issue. 
I will give it a try.

  reply	other threads:[~2014-06-17 22:04 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-10 14:31 [RFC PATCH 0/2] MSM/QCOM: Fix few race conditions when DEBUG_LL is enabled Srinivas Kandagatla
2014-06-10 14:31 ` [RFC PATCH 1/2] soc: qcom: do not disable the iface clock in probe Srinivas Kandagatla
2014-06-10 15:20   ` Kumar Gala
2014-06-10 17:39     ` Stephen Boyd
2014-06-10 17:46       ` Andy Gross
2014-06-10 17:47       ` Srinivas Kandagatla
2014-06-10 17:57         ` Andy Gross
2014-07-17 20:18   ` Srinivas Kandagatla
2014-08-12  4:25   ` Srinivas Kandagatla
2014-06-10 14:32 ` [RFC PATCH 2/2] tty:msm_serial: Do not reset IP if we use bootconsole Srinivas Kandagatla
2014-06-10 14:37   ` Srinivas Kandagatla
2014-06-17 21:09   ` Stephen Boyd
2014-06-17 22:04     ` Srinivas Kandagatla [this message]
2014-07-10 13:38     ` Srinivas Kandagatla

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