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From: ssreedharan@mvista.com (Sudhir Sreedharan)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] serial/core: Initialize the console pm state
Date: Mon, 6 Oct 2014 14:57:37 +0530	[thread overview]
Message-ID: <CAJJ77WvDaM2MmC_r9Wop68++L0FfaRmq6oiXTp+GdqcaKKwSBw@mail.gmail.com> (raw)
In-Reply-To: <CAMAWPa9R5HtGKkV=Ya-ekynY5maespZ0Q6BjwJcX3LN3857ZjQ@mail.gmail.com>

Hi Kevin,

On Wed, Oct 1, 2014 at 10:57 PM, Kevin Hilman <khilman@kernel.org> wrote:
> On Sun, Sep 21, 2014 at 11:30 PM, Sudhir Sreedharan
> <ssreedharan@mvista.com> wrote:
>> For console devices having UART_CAP_SLEEP capability, the uart_pm_state has
>> to be initialized to UART_PM_STATE_ON. Otherwise the LCR regiser values
>> are reinitialized when uart_change_pm is called from uart_configure_port.
>>
>> Signed-off-by: Sudhir Sreedharan <ssreedharan@mvista.com>
>
> Multiple boot failures on ARM[1] were bisected down to this patch.
>
> How was this patch tested, and on which platforms?



This patch was tested on x86-64(haswell) board, which uses ST16650V2
uart(which has UART_CAP_SLEEP).
While serial driver gets initialized, console port LCR register is
getting reinitalized to 0.
Then boot logs will be seen as garbage characters.

I will re-check why this failed on the boards/archs you mentioned.

Thanks,
Sudhir

  parent reply	other threads:[~2014-10-06  9:27 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1411367422-2095-1-git-send-email-ssreedharan@mvista.com>
2014-10-01 17:27 ` [PATCH] serial/core: Initialize the console pm state Kevin Hilman
2014-10-03  4:35   ` Greg KH
2014-10-03 12:22   ` Geert Uytterhoeven
2014-10-06  9:48     ` Sudhir Sreedharan
2014-10-06  9:27   ` Sudhir Sreedharan [this message]
2014-10-09 13:42     ` Sudhir Sreedharan
2014-10-09 13:45       ` [PATCH] tty: serial: 8250_core: Do not call set_sleep for console port Sudhir Sreedharan
2014-10-09 14:45         ` Peter Hurley
2014-10-15  6:43           ` [PATCH] tty: serial: 8250_core: restore the LCR register in set_sleep Sudhir Sreedharan
2014-10-16  7:21             ` Kevin Hilman
2014-10-16 10:15               ` Sudhir Sreedharan
2014-10-16 12:35             ` Peter Hurley
2014-10-17 10:25               ` Sudhir Sreedharan
2014-10-17 12:39                 ` [PATCH v1] " Sudhir Sreedharan
2014-10-17 12:46                   ` Peter Hurley
2014-10-20 15:01                   ` Kevin Hilman
2014-10-21  6:45                     ` Sudhir Sreedharan

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