From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Peter Hurley <peter@hurleysoftware.com>
Cc: Jiri Slaby <jslaby@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-next@vger.kernel.org,
linux-serial@vger.kernel.org, Rob Herring <robh@kernel.org>,
Yinghai Lu <yinghai@kernel.org>
Subject: Re: [PATCH v3] earlycon: 8250: Fix command line regression
Date: Sat, 4 Apr 2015 18:09:31 +0200 [thread overview]
Message-ID: <20150404160931.GC19278@kroah.com> (raw)
In-Reply-To: <1428157650-16418-1-git-send-email-peter@hurleysoftware.com>
On Sat, Apr 04, 2015 at 10:27:30AM -0400, Peter Hurley wrote:
> Restore undocumented behavior of kernel command line parameters of
> the forms:
> console=uart[8250],io|mmio|mmio32,<addr>[,options]
> console=uart[8250],<addr>[,options]
> where 'options' have not been specified; in this case, the hardware
> is assumed to be initialized.
>
> Document the required behavior of the original implementation.
>
> Fixes: c7cef0a84912cab3c9df8 ("console: Add extensible console matching")
> Reported-by: Yinghai Lu <yinghai@kernel.org>
> Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
> ---
>
> v3: Fixed automatic console to port line settings initialization;
> open-coded serial8250_console_setup() so the baud can be probed;
> added sha reference in commit log
>
> v2: Fixed regression which allowed "console=uart1337,..." to start a
> console (but not an earlycon)
> + fixed earlycon= documentation related required behavior fixed by
> this patch
>
> Documentation/kernel-parameters.txt | 18 ++++++++++++++---
> drivers/tty/serial/8250/8250_core.c | 38 +++++++++++++++++++++++++++++++++---
> drivers/tty/serial/8250/8250_early.c | 19 ------------------
> 3 files changed, 50 insertions(+), 25 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index bfcb1a6..1facf0b 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -713,10 +713,18 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>
> uart[8250],io,<addr>[,options]
> uart[8250],mmio,<addr>[,options]
> + uart[8250],mmio32,<addr>[,options]
> + uart[8250],0x<addr>[,options]
> Start an early, polled-mode console on the 8250/16550
> UART at the specified I/O port or MMIO address,
> - switching to the matching ttyS device later. The
> - options are the same as for ttyS, above.
> + switching to the matching ttyS device later.
> + MMIO inter-register address stride is either 8-bit
> + (mmio) or 32-bit (mmio32).
> + If none of [io|mmio|mmio32], <addr> is assumed to be
> + equivalent to 'mmio'. 'options' are specified in the
> + same format described for ttyS above; if unspecified,
> + the h/w is not re-initialized.
> +
> hvc<n> Use the hypervisor console device <n>. This is for
> both Xen and PowerPC hypervisors.
>
> @@ -944,11 +952,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> uart[8250],io,<addr>[,options]
> uart[8250],mmio,<addr>[,options]
> uart[8250],mmio32,<addr>[,options]
> + uart[8250],0x<addr>[,options]
> Start an early, polled-mode console on the 8250/16550
> UART at the specified I/O port or MMIO address.
> MMIO inter-register address stride is either 8-bit
> (mmio) or 32-bit (mmio32).
> - The options are the same as for ttyS, above.
> + If none of [io|mmio|mmio32], <addr> is assumed to be
> + equivalent to 'mmio'. 'options' are specified in the
> + same format described for "console=ttyS<n>"; if
> + unspecified, the h/w is not initialized.
>
> pl011,<addr>
> Start an early, polled-mode console on a pl011 serial
> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
> index e0fb5f0..f59c7a0 100644
> --- a/drivers/tty/serial/8250/8250_core.c
> +++ b/drivers/tty/serial/8250/8250_core.c
> @@ -3447,6 +3447,22 @@ static int univ8250_console_setup(struct console *co, char *options)
> return serial8250_console_setup(up, options);
> }
>
> +/* FIXME: this is broken on most other 8250 h/w */
What do you mean by "most other"? What hardware does this work for?
What is it broken for? What is someone supposed to think/do with this
comment?
thanks,
greg k-h
next prev parent reply other threads:[~2015-04-04 16:09 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-09 20:27 [PATCH v3 -next 00/11] Extensible console matching & direct earlycon Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 01/11] console: Add extensible console matching Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 02/11] serial: core: Fix kernel doc for uart_console_write() Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 03/11] serial: 8250_early: Remove early_device variable Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 04/11] serial: earlycon: Move ->uartclk initialize Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 05/11] serial: 8250_early: Assume uart already initialized if no baud option Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 06/11] serial: 8250_early: Fix setup() error code Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 07/11] serial: earlycon: Ignore parse_options() " Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 08/11] serial: earlycon: Skip parse_options() if empty string Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 09/11] serial: earlycon: Refactor earlycon registration Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 10/11] serial: earlycon: Enable earlycon without command line param Peter Hurley
2015-03-09 20:27 ` [PATCH v3 -next 11/11] serial: 8250_early: Remove setup_early_serial8250_console() Peter Hurley
2015-04-02 2:04 ` Yinghai Lu
2015-04-02 3:22 ` Peter Hurley
2015-04-02 9:15 ` Yinghai Lu
2015-04-02 16:31 ` Peter Hurley
2015-04-02 17:23 ` Yinghai Lu
2015-04-02 22:12 ` Yinghai Lu
2015-04-02 22:36 ` Yinghai Lu
2015-04-03 0:02 ` Yinghai Lu
2015-04-03 0:22 ` Yinghai Lu
2015-04-03 2:38 ` Yinghai Lu
2015-04-03 10:37 ` Peter Hurley
2015-04-03 16:57 ` Yinghai Lu
2015-04-03 17:38 ` Peter Hurley
2015-04-03 17:44 ` Yinghai Lu
2015-04-03 18:27 ` Peter Hurley
2015-04-03 19:00 ` Greg Kroah-Hartman
2015-04-03 23:03 ` [PATCH] earlycon: 8250: Fix command line regression Peter Hurley
2015-04-04 0:04 ` [PATCH v2] " Peter Hurley
2015-04-04 2:19 ` Yinghai Lu
2015-04-04 2:29 ` Peter Hurley
2015-04-04 2:50 ` Peter Hurley
2015-04-04 3:00 ` Yinghai Lu
2015-04-04 2:56 ` Yinghai Lu
2015-04-04 3:09 ` Peter Hurley
2015-04-04 3:28 ` Yinghai Lu
2015-04-04 3:09 ` Yinghai Lu
2015-04-04 3:15 ` Peter Hurley
2015-04-04 3:24 ` Yinghai Lu
2015-04-04 3:31 ` Yinghai Lu
2015-04-04 3:32 ` Peter Hurley
2015-04-04 3:37 ` Yinghai Lu
2015-04-04 3:41 ` Peter Hurley
2015-04-04 6:05 ` Yinghai Lu
2015-04-04 14:27 ` [PATCH v3] " Peter Hurley
2015-04-04 16:09 ` Greg Kroah-Hartman [this message]
2015-04-04 16:23 ` Peter Hurley
2015-04-04 16:52 ` Greg Kroah-Hartman
2015-04-04 17:08 ` Peter Hurley
2015-04-04 17:19 ` [PATCH v4] " Peter Hurley
2015-04-04 17:24 ` Peter Hurley
2015-04-04 17:41 ` Greg Kroah-Hartman
2015-04-05 7:09 ` Yinghai Lu
2015-04-05 13:06 ` Peter Hurley
2015-04-05 20:14 ` Yinghai Lu
2015-04-05 14:52 ` [PATCH v5] " Peter Hurley
2015-04-05 20:02 ` Yinghai Lu
2015-04-06 14:48 ` [PATCH v6] " Peter Hurley
2015-04-04 0:52 ` [PATCH v3 -next 11/11] serial: 8250_early: Remove setup_early_serial8250_console() Yinghai Lu
2015-04-04 1:16 ` Peter Hurley
2015-04-04 0:58 ` Yinghai Lu
2015-03-26 17:13 ` [PATCH v3 -next 00/11] Extensible console matching & direct earlycon Greg Kroah-Hartman
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