From: Eddie Huang <eddie.huang@mediatek.com>
To: Arnd Bergmann <arnd@arndb.de>, Alan Cox <alan@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
linux-doc@vger.kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>, Jiri Slaby <jslaby@suse.cz>,
Jonathan Corbet <corbet@lwn.net>,
yh.chen@mediatek.com, Howard Chen <ibanezchen@gmail.com>,
linux-serial@vger.kernel.org, "Joe.C" <yingjoe.chen@mediatek.com>,
devicetree@vger.kernel.org,
Vladimir Murzin <vladimir.murzin@arm.com>,
Pawel Moll <pawel.moll@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Rob Herring <robh+dt@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
linux-arm-kernel@lists.infradead.org,
srv_heupstream@mediatek.com,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
Ashwin Chaugule <ashwin.chaugule@linaro.org>,
Kumar Gala <galak@codeaurora.org>
Subject: Re: [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support noinit option
Date: Tue, 13 Jan 2015 09:05:29 +0800 [thread overview]
Message-ID: <1421111129.10374.4.camel@mtksdaap41> (raw)
In-Reply-To: <1421078918.31978.32.camel@linux.intel.com>
Hi Arnd,
On Mon, 2015-01-12 at 16:08 +0000, Alan Cox wrote:
> On Mon, 2015-01-12 at 16:35 +0100, Arnd Bergmann wrote:
> > On Monday 12 January 2015 21:08:21 Eddie Huang wrote:
> > > Add earlycon support not only baudrate option, but also add noinit option.
> > > If use noinit option, 8250 earlycon will not init serial hardware and use
> > > loader setting.
> > >
> > > Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
> >
> > I probably missed something in the previous discussion, but why is
> > "noinit" not just the default? I believe that is how we handle early
> > serial ports on PowerPC, and I see no downsides to it.
>
> Most PC hardware at least needs the port initialised to use it. It won't
> have been configured by the firmware in many cases.
>
Sorry no continue discuss in previous series. Since other 8250 user may
already depend on current init behavior, I think it's better to keep it
and add noinit by extra setting.
Eddie
next prev parent reply other threads:[~2015-01-13 1:05 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-12 13:08 [PATCH v2 0/4] tty: serial: Add earlycon support to MT8173 SoC Eddie Huang
2015-01-12 13:08 ` [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support noinit option Eddie Huang
2015-01-12 15:35 ` Arnd Bergmann
2015-01-12 16:08 ` Alan Cox
2015-01-13 1:05 ` Eddie Huang [this message]
[not found] ` <1421068104-30463-2-git-send-email-eddie.huang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2015-02-01 16:27 ` Peter Hurley
[not found] ` <54CE53F3.5040709-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2015-02-01 18:26 ` Peter Hurley
2015-02-02 3:16 ` Eddie Huang
2015-02-02 3:45 ` Peter Hurley
2015-02-02 4:28 ` Greg Kroah-Hartman
2015-02-02 5:15 ` Peter Hurley
2015-02-02 5:24 ` Greg Kroah-Hartman
2015-02-02 5:33 ` Eddie Huang
2015-02-02 5:43 ` Peter Hurley
2015-02-02 18:46 ` Greg Kroah-Hartman
2015-02-02 2:45 ` Eddie Huang
2015-02-02 3:27 ` Peter Hurley
2015-01-12 13:08 ` [PATCH v2 2/4] tty: serial: 8250_mtk: Add earlycon Eddie Huang
2015-01-12 13:08 ` [PATCH v2 3/4] arm64: dts: Add mediatek MT8173 earlycon support Eddie Huang
2015-01-12 13:08 ` [PATCH v2 4/4] Document: Modify 8250 earlycon kernel parameters Eddie Huang
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