linux-kernel - Re: [PATCH v1 10/14] serial: 8250_of: Switch to use uart_read_port

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Message-ID: <ad91eec0-39da-4b9c-8da7-f1e98bb4565b@broadcom.com>
Date: Thu, 22 Feb 2024 11:54:46 -0800
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Andrew Jeffery <andrew@...econstruct.com.au>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
 linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-aspeed@...ts.ozlabs.org, linux-rpi-kernel@...ts.infradead.org,
 linux-mips@...r.kernel.org, linux-tegra@...r.kernel.org,
 Jiri Slaby <jirislaby@...nel.org>, Joel Stanley <joel@....id.au>,
 Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Al Cooper <alcooperx@...il.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Paul Cercueil <paul@...pouillou.net>, Vladimir Zapolskiy <vz@...ia.com>,
 Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>,
 Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
 Masami Hiramatsu <mhiramat@...nel.org>,
 Andi Shyti <andi.shyti@...ux.intel.com>
Subject: Re: [PATCH v1 10/14] serial: 8250_of: Switch to use
 uart_read_port_properties()

On 2/22/24 09:39, Florian Fainelli wrote:
> On 2/22/24 08:47, Andy Shevchenko wrote:
>> On Thu, Feb 22, 2024 at 06:43:08PM +0200, Andy Shevchenko wrote:
>>> On Thu, Feb 22, 2024 at 03:23:24PM +0200, Andy Shevchenko wrote:
>>>> On Thu, Feb 22, 2024 at 11:07:05AM +1030, Andrew Jeffery wrote:
>>>>> On Wed, 2024-02-21 at 20:31 +0200, Andy Shevchenko wrote:
>>>>>> Since we have now a common helper to read port properties
>>>>>> use it instead of sparse home grown solution.
>>>>>
>>>>> I did some brief testing of the series for the Aspeed machines under
>>>>> qemu, building them on top of v6.8-rc5:
>>>>>
>>>>> export ARCH=arm
>>>>> export CROSS_COMPILE=arm-linux-gnueabihf-
>>>>> make aspeed_g5_defconfig
>>>>> make -j$(nproc)
>>>>> qemu-system-arm -M rainier-bmc -nographic -no-reboot -kernel 
>>>>> arch/arm/boot/zImage -dtb 
>>>>> arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-rainier.dtb -initrd ...
>>>>>
>>>>> I got an oops during boot, which bisected to this change:
>>>>
>>>> Thank you for prompt testing! I will look at it.
>>>
>>> I found the issue, will be fixed in next version.
>>
>> Whoever is going to test this series, the
>>
>> -        port->iotype = use_defaults ? UPIO_MEM : port->iotype;
>> +        port->iotype = UPIO_MEM;
>>
>> should be applied to uart_read_port_properties() implementation.
>>
> 
> Thanks, on 8250_bcm7271.c with the above hunk applied, I did not spot 
> any differences between the values returned by stty or a cat 
> /sys/class/tty/ttyS0/* before or after, the console remained fully 
> functional. I will see if I can run an additional test where I removed 
> the DT's "clocks" property and confirm that the fall back to 
> "clock-frequency" works.
> 
> Thanks Andy!

Also appears to work properly on a Raspberry Pi 4 with the console using 
the bcm2835-aux driver, will provide Tested-by tags on the next 
submission, thanks!
-- 
Florian


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