linux-kernel - Re: [RFC PATCH] tty: serial: msm_serial: Don't reset uart on set

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Date:	Wed, 15 Jun 2016 18:28:16 +0530
From:	Pramod Gurav <pramod.gurav@...aro.org>
To:	Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:	Andy Gross <andy.gross@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	David Brown <david.brown@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	"open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
	"open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
	"open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] tty: serial: msm_serial: Don't reset uart on set_termios

On 14 June 2016 at 00:32, Bjorn Andersson <bjorn.andersson@...aro.org> wrote:
> Upon opening the tty, uart_open() ends up calling msm_set_baud_rate()
> which resets the uart block. If this happens as we're coming out of
> msm_console_write() a full fifo worth of console output will be
> discarded.
>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>
> As reported here:
> https://bugs.96boards.org/show_bug.cgi?id=378
>
>  drivers/tty/serial/msm_serial.c | 18 ------------------
>  1 file changed, 18 deletions(-)

Thanks for the patch.

I no longer see these corruptions with this patch. This is what I used
to see on my DB410C with debain FS:
http://paste.ubuntu.com/17319106/

Tested-by: Pramod Gurav <pramod.gurav@...aro.org>

Regards,
Pramod