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From: Johan Hovold <johan@kernel.org>
To: Tony Lindgren <tony@atomide.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andy Shevchenko <andriy.shevchenko@intel.com>,
	Jiri Slaby <jirislaby@kernel.org>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	linux-serial@vger.kernel.org, linux-omap@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/6] serial: core: Add new prep_tx for power management
Date: Thu, 23 Sep 2021 14:45:54 +0200	[thread overview]
Message-ID: <YUx3AkT4Du/PT+V5@hovoldconsulting.com> (raw)
In-Reply-To: <20210921103346.64824-4-tony@atomide.com>

On Tue, Sep 21, 2021 at 01:33:43PM +0300, Tony Lindgren wrote:
> If the serial driver implements PM runtime with autosuspend, the port may
> be powered off for TX. To wake up the port, let's add new prep_tx() call
> for serial drivers to implement as needed. We call it from serial
> write_room() and write() functions. If the serial port is not enabled,
> we just return 0.

This isn't right. If there's room in the driver buffer, there's no
reason to not accept those characters.

It's the drivers responsibility to resume writing when write() is
called and that me need to be done in a runtime resume callback in case
the device is suspended.

No need to be patching line disciplines for this.

Johan

  reply	other threads:[~2021-09-23 12:46 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-21 10:33 [PATCH 0/6] Get rid of pm_runtime_irq_safe() for 8250_omap Tony Lindgren
2021-09-21 10:33 ` [PATCH 1/6] n_tty: Start making use of -EAGAIN returned from process_output_block() Tony Lindgren
2021-09-21 11:58   ` Andy Shevchenko
2021-09-21 10:33 ` [PATCH 2/6] tty: n_gsm: Don't ignore write return value in gsmld_output() Tony Lindgren
2021-09-21 10:33 ` [PATCH 3/6] serial: core: Add new prep_tx for power management Tony Lindgren
2021-09-23 12:45   ` Johan Hovold [this message]
2021-09-23 15:02     ` Tony Lindgren
2021-09-24 14:37       ` Johan Hovold
2021-09-24 15:09         ` Tony Lindgren
2021-09-27 14:05           ` Johan Hovold
2021-09-21 10:33 ` [PATCH 4/6] serial: 8250: Implement " Tony Lindgren
2021-09-23 12:49   ` Johan Hovold
2021-09-23 15:05     ` Tony Lindgren
2021-09-24 14:44       ` Johan Hovold
2021-09-24 15:16         ` Tony Lindgren
2021-09-21 10:33 ` [PATCH 5/6] serial: 8250_omap: Require a valid wakeirq for deeper idle states Tony Lindgren
2021-09-21 10:33 ` [PATCH 6/6] serial: 8250_omap: Drop the use of pm_runtime_irq_safe() Tony Lindgren
2021-09-21 12:03 ` [PATCH 0/6] Get rid of pm_runtime_irq_safe() for 8250_omap Andy Shevchenko

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