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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.com>,
	Serge Semin <fancer.lancer@gmail.com>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Paul Burton <paulburton@kernel.org>,
	Ralf Baechle <ralf@linux-mips.org>, Arnd Bergmann <arnd@arndb.de>,
	Long Cheng <long.cheng@mediatek.com>,
	Maxime Ripard <mripard@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	Kefeng Wang <wangkefeng.wang@huawei.com>,
	linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 3/4] serial: 8250_dw: Simplify the ref clock rate setting procedure
Date: Fri, 15 May 2020 17:05:47 +0300
Message-ID: <20200515140547.GE1634618@smile.fi.intel.com> (raw)
In-Reply-To: <20200506233136.11842-4-Sergey.Semin@baikalelectronics.ru>

On Thu, May 07, 2020 at 02:31:34AM +0300, Serge Semin wrote:
> Really instead of twice checking the clk_round_rate() return value
> we could do it once, and if it isn't error the clock rate can be changed.
> By doing so we decrease a number of ret-value tests and remove a weird
> goto-based construction implemented in the dw8250_set_termios() method.

>  	rate = clk_round_rate(d->clk, baud * 16);
> -	if (rate < 0)
> -		ret = rate;

> -	else if (rate == 0)
> -		ret = -ENOENT;

This case now handled differently.
I don't think it's good idea to change semantics.

So, I don't see how this, after leaving the rate==0 case, would be better than
original one.

> -	else
> +	if (rate > 0) {
>  		ret = clk_set_rate(d->clk, rate);
> +		if (!ret)
> +			p->uartclk = rate;
> +	}
>  	clk_prepare_enable(d->clk);
>  
> -	if (ret)
> -		goto out;
> -
> -	p->uartclk = rate;
> -
> -out:
>  	p->status &= ~UPSTAT_AUTOCTS;
>  	if (termios->c_cflag & CRTSCTS)
>  		p->status |= UPSTAT_AUTOCTS;

-- 
With Best Regards,
Andy Shevchenko



  reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200306130231.05BBC8030795@mail.baikalelectronics.ru>
     [not found] ` <20200306134049.86F8180307C2@mail.baikalelectronics.ru>
     [not found]   ` <20200310001444.B0F50803087C@mail.baikalelectronics.ru>
2020-03-10 14:17     ` [PATCH] serial: 8250_dw: Fix common clocks usage race condition Andy Shevchenko
     [not found]     ` <20200310141715.7063280307CA@mail.baikalelectronics.ru>
2020-03-12 18:47       ` Sergey Semin
2020-03-18 15:19         ` Andy Shevchenko
2020-03-23  2:46 ` [PATCH v2] " Sergey.Semin
2020-03-23  9:20   ` Andy Shevchenko
2020-03-23 11:11     ` Sergey Semin
2020-03-23 11:52       ` Andy Shevchenko
2020-03-23 17:07         ` Sergey Semin
2020-03-23 10:01   ` Maxime Ripard
2020-03-23 13:50     ` Sergey Semin
2020-03-24  9:41       ` Maxime Ripard
2020-03-24 10:12       ` Andy Shevchenko
2020-03-25 17:11         ` Sergey Semin
2020-03-26  1:44           ` Stephen Boyd
2020-03-27  9:12             ` Sergey Semin
2020-05-06 23:31   ` [PATCH v3 0/4] serial: 8250_dw: Fix ref clock usage Serge Semin
2020-05-06 23:31     ` [PATCH v3 1/4] serial: 8250: Fix max baud limit in generic 8250 port Serge Semin
2020-05-15 13:48       ` Andy Shevchenko
2020-05-06 23:31     ` [PATCH v3 2/4] serial: 8250: Add 8250 port clock update method Serge Semin
2020-05-15 12:45       ` Greg Kroah-Hartman
2020-05-15 14:32         ` Serge Semin
2020-05-06 23:31     ` [PATCH v3 3/4] serial: 8250_dw: Simplify the ref clock rate setting procedure Serge Semin
2020-05-15 14:05       ` Andy Shevchenko [this message]
2020-05-15 14:50         ` Serge Semin
2020-05-15 15:05           ` Andy Shevchenko
2020-05-06 23:31     ` [PATCH v3 4/4] serial: 8250_dw: Fix common clocks usage race condition Serge Semin
2020-05-15 14:10       ` Andy Shevchenko
2020-05-15 15:19         ` Serge Semin
2020-05-07 18:29     ` [PATCH v3 0/4] serial: 8250_dw: Fix ref clock usage Andy Shevchenko

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