linux-kernel - Re: [PATCH 5/5] tty: serial: Add 8250-core based omap driver

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Message-ID: <53C7E7BE.7030403@linutronix.de>
Date:	Thu, 17 Jul 2014 17:11:58 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	balbi@...com
CC:	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 5/5] tty: serial: Add 8250-core based omap driver

On 07/17/2014 04:54 PM, Felipe Balbi wrote:
> Hi,
> 
> On Wed, Jul 16, 2014 at 04:45:03PM +0200, Sebastian Andrzej Siewior wrote:
>> +static int omap_8250_startup(struct uart_port *port)
>> +{
>> +	struct uart_8250_port *up =
>> +		container_of(port, struct uart_8250_port, port);
>> +	struct omap8250_priv *priv = port->private_data;
>> +
>> +	int ret;
>> +
>> +	if (priv->wakeirq) {
>> +		ret = request_irq(priv->wakeirq, omap_wake_irq,
>> +				port->irqflags, "wakeup irq", port);
>> +		if (ret)
>> +			return ret;
>> +		disable_irq(priv->wakeirq);
>> +	}
>> +
>> +	ret = serial8250_do_startup(port);
>> +	if (ret)
>> +		goto err;
>> +
>> +	pm_runtime_get_sync(port->dev);
> 
> should this pm_runtime_get_sync() be placed above
> serial8250_do_startup() call ?

I don't think it matters since serial8250_do_startup() has its own
pm_runtime_get_sync().

->startup(), ->shutdown() are called via omap callbacks so we could
spare in the 8250-core if we do it in the omap code before invoking the
function. The same goes for serial8250_set_termios() which is not used
by omap but has those runtime-pm stuff, too.
It would be wrong if someone would use the serial8250_do_startup()
without his own runtime-pm get but it is omap only which does this
things.
So it is not used by anyone else (right now) and if you want to keep it
to a minimum I could remove them from those places.

Sebastian
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