[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAJJ77WvDaM2MmC_r9Wop68++L0FfaRmq6oiXTp+GdqcaKKwSBw@mail.gmail.com>
Date: Mon, 6 Oct 2014 14:57:37 +0530
From: Sudhir Sreedharan <ssreedharan@...sta.com>
To: Kevin Hilman <khilman@...nel.org>
Cc: linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
jslaby@...e.cz, lkml <linux-kernel@...r.kernel.org>,
olof@...om.net,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] serial/core: Initialize the console pm state
Hi Kevin,
On Wed, Oct 1, 2014 at 10:57 PM, Kevin Hilman <khilman@...nel.org> wrote:
> On Sun, Sep 21, 2014 at 11:30 PM, Sudhir Sreedharan
> <ssreedharan@...sta.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@...sta.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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists